Looking forward to the photos, Marcia.

at this point I am looking forward to hearing from them in the field. From Julie I got the webcam site since it is steaming again. Then the following report: Oct 13, 12:31 PM EDT Lava Breaks Surface at Mount St. Helens By PEGGY ANDERSEN Associated Press Writer SEATTLE (AP) -- After weeks of earthquakes and steam eruptions, Mount St. Helens has a new lava dome that could even eclipse the volcano's old one. The quakes subsided as the new lava emerged Monday and cooled in the open air, suggesting molten rock from deep inside the Earth had found the path of least resistance by going around the old dome, said Jon Major, a hydrologist with the U.S. Geological Survey. Unlike the dramatic rivers of red-hot lava from Hawaii's volcano, St. Helens' extrusion of new rock was subtle and difficult to see from outside the crater. A lazy plume of steam rose slowly from the mountain for much of Tuesday. Infrared instruments recorded a surface temperature of nearly 1,100 degrees Fahrenheit, confirming that the second dome consisted of cooling lava rather than old rock which had been pushed upward, said USGS volcanologist Willie Scott. "The fact that we see stuff at the surface that hot means it's new rock," Scott said. The last dome-building activity at St. Helens began in the months after its deadly May 1980 eruption and lasted six years. Layers of emerging rock gradually formed a rocky dome nearly 1,000 feet tall at the center of the crater floor. The top of the new dome is almost level with the old one just to the north. more... http://hosted.ap.org/dynamic/stories/M/MOUNT_ST_HELENS?SITE=KGW&SECTION=HOME&TEMPLATE=US-WORLD.html

Mount St Helens webcam: http://www.fs.fed.us/gpnf/volcanocams/msh/

/Mount St Helen's update October 13, 2004 Current status is Volcano Advisory (Alert Level 2); aviation color | | code ORANGE | | | | | | Seismic activity remained at a low, but slightly increasing level | | overnight. Yesterday's visual observations and thermal imaging of the | | 1980-86 lava dome, the intensely deforming and uplifting area on the | | south side of the dome, and the new lava extrusion first seen on | | October 11 were hampered by steam clouds. Conditions appeared similar | | to those of October 11, with high temperatures (up to 600 degrees C) | | around the fin-shaped lava extrusion in the western part of the | | uplift. The area of high temperature appears to have increased in | | size. Abundant steam continued to rise from the fin area to the crater | | rim, from which it wa dispersed southeastward by strong winds. | | | | | | Today, field crews will take new thermal images of the crater floor | | and dome, make gas-sensing measurements, perform routine maintenance | | of GPS sites, and take hydrological measurements. | | | | | | Wind forecasts from the National Oceanic and Atmospheric | | Administration (NOAA), combined with eruption models, show generally | | northerly winds. Any ash clouds will drift southward to southeastward. | | | | | | As a result of the intense unrest of the pa t two and one-half weeks | | and recent observations, we infer that magma is at a very shallow | | level and is extruding onto the surface. Incandescence from hot rock | | or gases reflects off steam clouds and is visible from north of the | | volcano. | | | |--------------------------------------------------------------------------| This email was cleaned by emailStripper, available for free from http://www.printcharger.com/emailStripper.htm

This was from October 11, 2004 and the photos sent with the information show beautiful dusting of snow and a white plume of steam. That plume was visible this afternoon on the webcam. Viewing conditions were very clear most of October 10, and fresh snow | | had fallen to the level of the crater floor north of the dome. A USGS | | field crew noticed a thin ash deposit on the snow in the crater and | | just beyond the crater rim, trending southeast from the active area. | | | | | | A steam plume rose to crater rim level or slightly above all day on | | October 10, heading to the southeast. USGS field workers described the | | plume as "lazy"?no gas thrust or notably vigorous convection was | | observed. The plume was clean, with no noticeable ash or blue/orange | | haze. The odor of H2S was noted at the crater breach, but not | | elsewhere. | | | | | | Helicopter field crews were at work on Sunday October 10. A | | telemetered webcam was placed at Sugarbowl and GPS data were | | downloaded. | | | | | | The thermal imaging crew made an excellent video of the uplifted area | | of the south crater floor. The western portion of the the uplift was | | steaming over a large diffuse area. Maximum measured surface | | temperatures were 200-300 deg. C. The thermal imaging crew judged the | | uplifted area to have grown since it was last seen on the 7th. | | | | | | No gas observations were made on October 10. | | | | | | Rockfall deposits were not seen on or around the uplifted area, | | perhaps indicating a lull in its growth or deformation. |

Thanks to "them in the field".

They want to return and likely will. Family matters interfere with plans otherwise. I am still hoping they see more than steam or degassing, but please not so close as to be in danger. I know my son...!

Here is today's Mount Saint Helens condensed update: In the past 24 hours, seismicity has decreased somewhat and remains at a low level compared to that observed early in this unrest. The current seismicity is consistent with a continuing, slow rise of magma driving uplift of the crater floor and feeding a surface extrusion of lava. Last night, glow from this new lava was intermittently visible on the U.S. Forest Service web camera. The overall low rates of seismicity and gas emission suggest that the lava reaching the surface is gas poor. Yesterday was a busy day in the field. Geological and thermal-imaging observations confirmed that both the area of uplift and the new lava extrusion have increased in size noticeably since last seen on October 14. The area of uplift and intense deformation continues to move southward and is nearing the crater wall. About 1 foot of new snow with a light dusting of ash covers much of the uplift, except for the new lava extrusion, which is steaming heavily. The new lava extrusion, which occupies the western part of the uplift, is now about 900 ft long by 250 ft wide and 230 ft high and has a volume of almost 2 million cubic yards. Its maximum temperature is about 600 degrees C (1100 degrees F). Rock samples from the new lava extrusion were collected from a helicopter by using a bucket slung on a 100-ft line. The samples look like typical Mount St. Helens lava, called dacite. Further detailed analyses of the samples will help to answer questions about the character of the magma driving the eruption and how it r lates to lava erupted in the 1980s. A gas-sensing flight detected low levels of the volcanic gases carbon dioxide, sulfur dioxide, and hydrogen sulfide, which is consistent magma continuing to rise from depth. Test flights of the Unmanned Aerial Vehicles (UAVs), which will hopefully be used for monitoring the crater area in the future, were conducted yesterday close to the Johnston Ridge Observatory. More tests are scheduled for today if weather conditions permit. Field crews will attempt to obtain additional geological and thermal-imaging observations today. Other work will continue on maintenance of instrumentation and improving our telemetry systems. Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA), coupled with eruption models, show that ash clouds that rise above the crater rim today would drift southeastward from the volcano. This email was cleaned by emailStripper, available for free from http://www.printcharger.com/emailStripper.htm

Sorry about that, the above report was October 21 and a little older than today's. I'll try to post a newer one.

marica, i'm sooooo glad to see you here (have made the change to cable dsl and now our chats can be soo much faster).....

Wolfie, I am trying to download the MSN IM again on this computer but so far I have hit only snags. I'll try again right after this report. Cheers on your DSL. I am all envy ! ************************** Mount St. Helens updates ************************** 08 Nov 04 MSH Update From: William E Scott U.S. Geological Survey, Vancouver, Washington University of Washington, Pacific Northwest Seismograph Network, Seattle, Washington November 8, 2004 10:30 am PST (1830 UT) MOUNT ST. HELENS VOLCANO Current status is Volcano Advisory (Alert Level 2); aviation color code ORANGE Growth of the new lava dome inside the crater of Mount St. Helens continues, and is accompanied by intermittent emissions of steam and ash. As long as this eruption is in progress, episodic changes in the level of activity can occur over days, weeks, or even months. Increase in the intensity of eruption could occur suddenly or with very little warning and may include explosive events that produce hazardous conditions within several miles of the volcano. Small lahars (volcanic debris flows) could suddenly descend the Toutle River valley if triggered by heavy rain or by interaction of hot rocks with snow or glacier ice. These lahars pose a negligible hazard below the Sediment Retention Structure (SRS) but could pose a hazard to people along the river channel upstream of the SRS. At this time of year, it is not unusual for rivers draining the volcano to contain high concentrations of sediment that turn the water murky. Although considered less likely at this time, the current eruptive activity could evolve int a more explosive phase that affects areas farther from the volcano and sends significant ash thousands of feet above the crater where it could be a hazard to aircraft and to downwind communities. Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA), coupled with eruption models, show that ash clouds that rise above the crater rim today would drift northward to northeastward depending on their altitude. Visibility is excellent and likely will remain so throughout the day. A steam plume is rising passively and drifting northward out of the crater. The plume occasionally contains minor ash, which falls out in the crater and on the flank of the volcano, darkening the snow. Seismicity remains at a low level compared to that observed early in this unrest. The current seismicity is consistent with a continuing, slow rise of magma driving uplift of the crater floor and feeding a surface extrusion of lava. The overall low rates of seismicity and gas emission suggest that the lava reaching the surface is gas poor, thereby reducing the probability of highly explosive eruptions in the near term. Aerial observations yesterday showed that the new dome continues to expand and move upward. Small aprons of rockfall debris are accumulating at several sites around the new dome. Some ash emissions may be caused by these rockfalls as collapsing hot dome lava disintegrates into smaller fragments. No field investigations are planned for today. The U.S. Geological Survey and the University of Washington continue to monitor the situation closely and will issue additional updates and changes in alert level as warranted. For additional information, background, images, and other graphics: http://vulcan.wr.usgs.gov/News/framework.html For seismic information: http://www.pnsn.org/HELENS/welcome.html For a definition of alert levels: http://vulcan.wr.usgs.gov/News/framework.html Telephone recordings with the latest update on Mount St. Helens and phone contacts for additional information can be heard by calling: Media (360) 891-5180 General public (360) 891-5202 ******************* see also: http://story.news.yahoo.com/news?tmpl=story&cid=519&e=15&u=/ap/mount_st__helens "Mount St. Helens Lava Formation Grows" excerpt: "A lava formation inside Mount St. Helens' crater has a new, glowing protrusion the size of a 30-story building. The protrusion, which glows red at night, has risen by 330 feet in the past nine days, pushed up by magma, or molten rock, within the volcano, scientists said Friday." ******************* 05 Nov 04 MSH Update From: David R Sherrod U.S. Geological Survey, Vancouver, Washington University of Washington, Pacific Northwest Seismograph Network, Seattle, Washington November 5, 2004 10:00 am PST (1800 UT) MOUNT ST. HELENS VOLCANO Current status is Volcano Advisory (Alert Level 2); aviation color code ORANGE Growth of the new lava dome inside the crater of Mount St. Helens continues. As long as this eruption is in progress, episodic changes in the level of activity can occur over days, weeks, or even months. Increase in the intensity of eruption could occur suddenly or with very little warning and may include explosive events that produce hazardous conditions within several miles of the volcano. Small lahars (volcanic debris flows) could suddenly descend the Toutle River valley if triggered by heavy rain or by interaction of hot rocks with snow or glacier ice. These lahars pose a negligible hazard below the Sediment Retention Structure (SRS) but could pose a hazard to people along the river channel upstream of the SRS. At this time of year, it is not unusual for rivers draining the volcano to contain high concentrations of sediment that turn the water murky. Although considered less likely at this time, the current eruptive activity could evolve into a more explosive phase that affects areas farther from the volcano and sends significant ash thousands of feet above the crater where it could be a hazard to aircraft and to downwind communities. Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA), coupled with eruption models, show that ash clouds that rise above the crater rim today would drift westward to southwestward. Visibility is excellent and likely will remain so throughout the day. A steam plume is rising passively and drifting south and southwestward over the crater rim. The plume occasionally contains minor ash, which falls out in the crater and on the southern flank of the volcano, darkening the new snow. Seismicity remains at a low level compared to that observed early in this unrest. The current seismicity is consistent with a continuing, slow rise of magma driving uplift of the crater floor and feeding a surface extrusion of lava. The overall low rates of seismicity and gas emission suggest that the lava reaching the surface is gas poor, thereby reducing the probability of highly explosive eruptions in the near term. Crews were in the field yesterday, the first opportunity following a spate of inclement weather. Their findings: Sulfur dioxide (SO2) emission rates continue to be low and consistent with previous measurements. No hydrogen sulfide (H2S) was detected. Ash in the steam plume prevented an accurate measurement of carbon dioxide (CO2). The elongated new dome, which extends southward from the 1980-1986 dome, has undergone substantial vertical growth since October 27. A new mass of dacite has extruded upward by as much as 100 m. Exposed rock faces have temperatures in the range 400-500 degrees Celsius, creating the incandescence that may be seen from the north on clear nights. Field crews conducted geologic observation flights in the crater. To collect samples they landed a helicopter on the new dome for the second time in two weeks. The new dacite lava contains visible crystals of plagioclase, hornblende and hypersthene. These samples are similar to those collected on October 27 and also to lava erupted at Mount St. Helens in the 1980s. The steep new faces on the dome are generating small hot rockfalls and avalanches within the crater. The finer particulate from these deposits roils upward within the steam plume, rising to about 11,000 ft altitude, or about 2,600 ft above the crater rim. Consequently the south and southwest flank of the volcano have received a notable dusting of ash. This localized ash poses no threat beyond the near slopes of the volcano. Most dome growth has been vertical, with only about 30 m of outward growth in some directions. The thick glacial ice that forms a buttress on the south and east sides of the dome remains largely intact. All dome growth is contained within the Mount St. Helens crater. A continuous GPS station north of the volcano at Johnston Ridge Observatory has moved to the south by about 2 cm since late September or early October. This slow shift may reflect a depletion of magma in the subsurface at 5-10 km depth. To confirm this result, five new GPS receivers were positioned around the volcano's flanks 5-10 km from the crater to better track changes in the deeper parts of the magmatic system. Two additional units will be deployed today. The U.S. Geological Survey and the University of Washington continue to monitor the situation closely and will issue additional updates and changes in alert level as warranted. For additional information, background, images, and other graphics: http://vulcan.wr.usgs.gov/News/framework.html For seismic information: http://www.pnsn.org/HELENS/welcome.html For a definition of alert levels: http://vulcan.wr.usgs.gov/News/framework.html This email was cleaned by emailStripper, available for free from http://www.printcharger.com/emailStripper.htm

MSH Current status is Volcano Advisory (Alert Level 2); aviation color code ORANGE Growth of the new lava dome inside the crater of Mount St. Helens continues, and is accompanied by intermittent emissions of steam and ash. As long as this eruption is in progress, episodic changes in the level of activity can occur over days, weeks, or even months. Increase in the intensity of eruption could occur suddenly or with very little warning and may include explosive events that produce hazardous conditions within several miles of the volcano. Small lahars (volcanic debris flows) could suddenly descend the Toutle River valley if triggered by heavy rain or by interaction of hot rocks with snow or glacier ice. These lahars pose a negligible hazard below the Sediment Retention Structure (SRS) but could pose a hazard to people along the river channel upstream of the SRS. At this time of year, it is not unusual for rivers draining the volcano to contain high concentrations of sediment that turn the water murky. Although considered less likely at this time, the current eruptive activity could evolve into a more explosive phase that affects areas farther from the volcano and sends significant ash thousands of feet above the crater where it could be a hazard to aircraft and to downwind communities. Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA), coupled with eruption models, show that ash clouds that rise above the crater rim today would drift northward to northeastward depending on their altitude. This morning's images on the VolcanoCam show that a steam plume is rising passively and drifting northward out of the crater. The plume occasionally contains minor ash, which falls out in the crater and on the flank of the volcano, darkening the snow. Seismicity remains at a low level compared to that observed early in this unrest. The current seismicity is consistent with a continuing, slow rise of magma driving uplift of the crater floor and feeding a surface extrusion of lava. The overall low rates of seismicity and gas emission suggest that the lava reaching the surface is gas poor, thereby reducing the probability of highly explosive eruptions in the near term. The latest estimate of the volume of the uplifted area and new lava dome from detailed analysis of aerial photographs taken on 4 November is about 20 million cubic meters (26 million cubic yards). This compares with volumes of about 5 million cubic meters on 4 October and 12 million cubic meters on 13 October. The apparent decrease in rate of volume change (7 million cubic meters in the earlier 9-day period versus 8 million cubic meters in the later 22-day period) doesn't take into account millions of cubic meters of glacier ice that have been removed from a large part of the area of uplift. Work is underway to assess this effect. The 20-million-cubic-meter volume of the new uplift and lava dome is now more than 25% of the volume of the lava dome that grew in the crater between 1980 and 1986. Today's field work includes retrieval of GPS instruments from drive-to sites and routine maintenance and measurements at several stream gages. The U.S. Geological Survey and the University of Washington continue to monitor the situation closely and will issue additional updates and changes in alert level as warranted. " If I knew how to post images under Terry's new system I'd post images of molten red lava in a very yellow-hot vent on MSH

Eruption of Grimsvotn volcano Release of overburden pressure triggers an eruption of Grimsvotn volcano, Iceland, November 1, 2004 The subglacial Grimsvotn volcano, Iceland, started erupting on November 1, 2004 around 22 GMT. An intense swarm of volcanic earthquakes that started about 3 hours earlier changed at that time to continuous low frequency tremor, indicating onset of an eruption. Weather conditions prohibited direct observations of the beginning of the eruption at this remote volcano situated near the center of Europe's largest ice cap, Vatnajokull. The eruption was preceded by both long-term and short-term precursors, and finally triggered by release of overburden pressure associated with a glacial outburst flood (jokulhlaup), originating from the Grimsvotn subglacial caldera lake, that preceded the eruption. Accumulation of magma in a shallow magma chamber under the Grimsvotn caldera has been ongoing since its last eruption in 1998 (Sturkell et al., 2003; Sigmundsson et al., 2004). GPS measurements show uplift of 5-10 cm/year in the caldera center, and horizontal displacements away from the caldera. Earthquake activity increased in middle of 2003, at about the same time uplift exceeded its 1998 maximum. Pressure in the Grimsvotn magma chamber is likely to have exceeded its pre-eruption level from 1998 at this time. Additional uplift and expansion of the volcano since then suggested approaching failure of the vol cano. Earthquake activity increased further in late October, 2004. Geothermal heat sustains a lake in the caldera that intermittently causes glacial outburst floods. On October 26 high frequency seismic tremor indicated increased water flow from the caldera lake and suggested that a glacial outburst flood was about to begin. On October 29 discharge increased in river Skeidara. The outburst flood was caused by high water level in the Grimsvotn caldera lake from ice melting by geothermal activity. The release in overburden pressure associated with the outburst flood riggered the eruption. The drop in water level in the Grimsvotn caldera at the onset of the eruption is uncertain, but is probably on the order of 10-20 meters, corresponding to a pressure change of 0.1-0.2 MPa on the volcano surface. This modest pressure change triggered the eruption because internal pressure in the Grimsvotn shallow magma chamber was high after continuous inflow of magma to the volcano since 1998. Background: Grimsvotn volcano (N 64.41�, W 17.33�), situated near the center of the Vatnajokull ice cap in central Iceland, is one of Iceland's most active volcanoes. It has a complex of calderas (Gudmundsson and Milsom, 1997), and a subglacial caldera lake sustained by geothermal heat. Small eruptions have occurred at the volcano in 1983 and 1998 (around 0.1 km3). In 1996, the Gjalp subglacial eruption occurred north of the volcano (Gudmundsson et al., 1997). The most recent eruption triggered by a pressure release as the current eruption occurred in 1934.

Here is a condenced update for MSH for November 11 (the last one I got) "Growth of the new lava dome inside the crater of Mount St. Helens continues, and is accompanied by intermittent emissions of steam and ash. Wind forecasts from the National Oceanic and Atmospheric Administration (NOAA), coupled with eruption models, show that ash clouds that rise high above the crater rim today would drift west-northwestward. Clear views this morning show that a steam plume is rising passively and drifting westward out of the crater. The plume occasionally contains minor ash, which falls out in the crater and on the flank of the volcano, darkening the snow. Yesterday field crews repaired the DomeCam, the time-lapse camera that is aimed at the new lava dome from a site near the crater mouth, and conducted visual and thermal-imaging observations and a gas-sensing flight. Strong winds made interpretation of gas data difficult. Good viewing conditions revealed continued growth of the lava dome. Current estimates are that the welt, the broad area of deformation, is about 600 m (about 1950 feet) in diameter. The new lava dome, which occupies the central and western parts of the welt, is about 400 by 180 m (1300 by 600 feet). The highest point on the new lava dome is about 250 m (820 feet) above the former surface of the glacier that occupied that point in mid-September. Maximum surface temperatures on the new dome remain at about 700 degrees C (1300 degrees F). GPS instruments on the welt show rates of movement of up to several meters per day, while GPS instruments on the 1980-86 lava dome show movements of up to 1-2 cm (less than one inch) per day northward, away from the growing welt and new dome. "

Check Mt Etna's web camera. There seems to be two 'a'a flows http://www.ct.ingv.it/UfMoni/ (click on Etna Milo Webcam)

In Memoriam John Shakleford The volcano listserv is sad to announce the passing of Dan Shackelford earlier this year. As Dan was not a professional volcanologist, the volcano community at large may be unaware of his death, but his contributions to the volcano list, as well as his spirit and enthusiasm for volcanology, have certainly been missed. Rick Wunderman of the Smithsonian Institution's Global Volcanism Program has contributed an obituary for Dan, below. Jon Fink Lisa Koenig Volcano Listserv moderators ------------------------- From: Rick Wunderman In appreciation of Dan Shackelford Dan Shackelford, a dedicated amateur scientist and possibly this listserv's most prolific contributor, passed away in his Fullerton, California apartment this past spring. He was single and 53 years old. Dan adopted volcanoes as a hobby in high school. He started by tallying eruptive data on small index cards, but later advanced through a series of computers to acquire and manage volcano data. Since his high school days, Dan maintained personal correspondences with many volcanologists about important eruptions or database questions and issues. For a recent example, in the Bulletin of the Global Volcanism Network (vol. 29, no. 4), a correction regarding Pago volcano in Papua New Guinea came to light because of Dan's dogged questioning. This kind of cross checking and analysis helped strengthen the Smithsonian's database. Since the advent of the internet and this listserve, Dan's postings here have typically announced volcanism, usually copying text from a news report or an observatory announcement. His e-mails nearly always ended with his graphical signature line, a large, smoke-bellowing locomotive (shown at the bottom). He found the source materials and forwarded these announcements on his own accord, on his own time, and usually preserving source authorship. He was, in a sense, a self-appointed (and unpaid) town crier of volcanism. He clearly relished this role of providing rapid-breaking volcano news. With the advent of better search engines and more observatory websites this material has become easier to obtain; however, the service remains vital in a field where active processes are so important. His zeal to announce the latest events had its risks. In a 22 September 2003 message Dan described how the virus called SVEN passed from other's machines had ultimately caused his own to fail. Besides making announcements, Dan also compiled his own database, drew his own conclusions, and was unafraid to defend them. Although I spoke with Dan many times, I never asked him to explain why he was so prolific at announcing new activity. What drove him? He was clearly steeped in the lore of famous devastating eruptions. I think he enjoyed the act of getting the news first and then pondering the unstated details missing from news reports. In phone calls to me he frequently spoke about possible progressions of activity and various outcomes. He generally preferred to offer the more extreme and dire outcomes, but such propensities are common. Although he enjoyed the fact that he could beat most others at gathering announced events by skillful use of the web, I suspect that much of his sense of mission grew out of seeing that he could fill an important need in the service of science. So far as I know, he never gained material profit from announcing new activity, nor had he ever held a job as an earth scientist. I much appreciate his service and think the community benefited enormously from his efforts to gather and dissem nate fast-breaking news. He will be missed. Dan grew up with well-educated parents. His father served in WWII and went to college on the GI Bill, settling in Southern California and working as an engineer in the space program. His mother had an advanced degree in design. He is survived by his brother Lynn. Dan's two other passions consisted of sports and science fiction; and his apartment contained 600-700 science fiction paperbacks as well as personal correspondences with many authors. An avid conversationalist, Dan made his living as a telemarketer, most recently representing the mortgage and refinance industry. But, he had not worked in over a year as his health had deteriorated and he fought with both heart problems and thyroid cancer. Still, amazingly, he managed to continue making frequent announcements of eruptions to this listserv. His last message to the listserv came on the morning of 28 April, shortly before his death.

Dan Shakleford This wonderful man was not a professional volcanologist but he supplied all of th data I posted on all of the volcanoes on earth. He will be missed !

Broadcast News March 9, 2005 MOUNT ST. HELENS, Washington -- Mount St. Helens is blowing some smoke, but seismologists say not to worry. The volcano in Washington state released a towering plume of ash yesterday, its most significant emission in months. But experts say the release isn't likely a signal for any major eruption. The volcano has vented ash and steam since last fall, when thousands of small earthquakes marked a seismic reawakening of the mountain. Television footage showed the plume billowing thousands of metres into the air, then drifting slowly to the northeast. The afternoon ash explosion happened about an hour after a 2.0 magnitude quake. It rumbled on the east side of the mountain.

Report from USGS March 9, 2005 "A small but significant explosive event occurred yesterday at 5:25 p.m. PST. Pilot reports indicated that the resulting steam-and-ash plume reached an altitude of 36,000 feet above sea level within minutes. The main eruption pulse lasted about 10 minutes, but lower levels of activity persisted for at least another 15 to 45 minutes. Within minutes of the onset of this event, we lost communication with 7 monitoring stations in the crater, but not with any stations outside the crater. The event followed a few hours of slightly increased seismicity that was noted but not interpreted as precursory activity. There were no other indications of an imminent change in activity. Still images from a camera at the northeast end of the crater mouth show a clear component of explosive vertical jetting associated with the event and evidence of ballistics extending at least as far as the north side of the old dome. Aerial photos in of the waning phases of the activity in conjunction with these still images show evidence of small ash flows having moved north and onto to old lava dome. There were reports of fine dustings of ash falling in Ellensberg, Yakima, and Toppenish, Washington between 7pm and 9pm yesterday. As of 2am today, the leading edge of the plume had been tracked to western Montana as a faint and diffuse cloud. Today, field crews will make visual observations and attempt to retrieve and possibly redeploy some of the crater instrumentation stations. "

The webcam looks peaceful enough... http://www.fs.fed.us/gpnf/volcanocams/msh/

Plume from Mount St. Helens, as seen from the Cascade Volcano Observatory Office roof, taken approximately at 5:30 PM, PST. Plume is drifting east-northeast after reaching approximately 36,000 feet above sea level. http://vulcan.wr.usgs.gov/Imgs/Jpg/MSH/MSH05/MSH05_plume_from_CVO_office_03-08-05_med.jpg

http://www.volcano.si.edu/reports/bulletin/contents.cfm?issue=special#bgvn_1605 is the Bulletin of the Global Volcanism Network has obits of prominent volcanologists

http://news.bbc.co.uk/2/hi/science/nature/4326987.stm Super Volcanoes Geologists have called for a taskforce to be set up to consider emergency management in the event of a massive volcanic eruption, or super-eruption. The recommendation comes in a report timed to coincide with a BBC TV drama that depicts a fictional super-eruption at Yellowstone Park in Wyoming, US. Experts say such an event would have a colossal impact on a global scale. A super-eruption is also five to 10 times more likely to happen than an asteroid impact, the report claims. happens once every 100,000 years.

One past super-eruption struck at Toba in Sumatra 74,000 years ago and is thought by some to have driven the human race to the edge of extinction. Signs from DNA suggest human numbers could have dropped to about 10,000, probably as a result of the effects of climate change. from the above source

Toba is one, Mazama is another (now Crater Lake in Oregon, USA) and so is Yellowstone, probably the biggest single cataclysm on the North American continent. Yellowstone will erupt again, but whether it will be in our lifetimes is still to be seen. Probably not.

I can't find the Super Volcano TV show on Tivo. Guess I'll have to google it. (googles for super volvano tv show) Zip.

Nada.

Surviving Eruption at Pinatuba Sat 3/12 9 pm CST National Geo Channel.

Julie? I am currently on just antenna channels for tv so my access to intelligent thought is limited to two PBS stations currently running entertaining specials while trying to get donations. We really DO need cable !!

If MSNBC counts, http://www.msnbc.msn.com/id/7129908/

do you have BBC available? Check out this programming http://www.bbc.co.uk/science/horizon/1999/supervolcanoes.shtml

i saw the surviving Pinatuba...couldn't believe that one family survived in the caves underneath bat dung!!!

Well Supervolcanoes turns out not be such hot news after all. But I found the *transcript* interesting: http://www.bbc.co.uk/science/horizon/1999/supervolcanoes_script.shtml

Nice, but not the pithy action-packed volcanic eruption of super volcano I expected. Maybe I hope for too much. After all, we are just watching from a distance of a few million years. The last supervolcano in historic times was Krakatoa in 1883.

For those of you who have been wanting a Kilauea Webcam, there is one, finally. Three of the four cameras are not currently working but one still is. http://hvo.wr.usgs.gov/cam/index.htm

Did they get wiped out by the volcano?

No, they are back up, actually. The corrosiveness of the air around the vent makes it likely that mechanical malfunctions put them down for a few weeks. They are back so go enjoy them. I'll be treading the sacred precincts in a few days. Wish me luck !!

*************************************************** GVP/USGS Weekly Volcanic Activity Report 21-27 September 2005 *************************************************** From: Gari Mayberry http://www.volcano.si.edu/reports/usgs/ New Activity: | Erta Ale, Ethiopia | Shiveluch, Russia Ongoing Activity: | Bagana, Papua New Guinea | Barren Island, Andaman Islands | Colima, M�xico | Kilauea, USA | Langila, Papua New Guinea | Manam, Papua New Guinea | Rabaul, Papua New Guinea | Reventador, Ecuador | Santa Ana, El Salvador | Soufri�re Hills, Montserrat | Spurr, USA | St. Helens, USA | Suwanose-jima, Japan | Tungurahua, Ecuador | Veniaminof, USA New Activity/Unrest ERTA ALE Ethiopia 13.60�N, 40.67�E; summit elev. 613 m According to unconfirmed reports from local authorities, Erta Ale began erupting on 24 September after a series of earthquakes occurred along the Afar western margin on the previous day. The earthquakes, with a maximum magnitude of 5.5, were recorded at the Geophysical Observatory of Addis Ababa University. A group of geologists and geophysicists were planning to travel to the field to make observations. Background. Erta Ale is an isolated basaltic shield volcano that is the most active volcano in Ethiopia. The broad, 50-km-wide volcano rises more than 600 m from below sea level in the barren Danakil depression. Erta Ale is the namesake and most prominent feature of the Erta Ale Range. The 613-m-high volcano contains a 0.7 x 1.6 km, elliptical summit crater housing steep- sided pit craters. Another larger 1.8 x 3.1 km wide depression elongated parallel to the trend of the Erta Ale range is located to the SE of the summit and is bounded by curvilinear fault scarps on the SE side. Fresh-looking basaltic lava flows from these fissures have poured into the caldera and locally overflowed its rim. The summit caldera is renowned for one, or sometimes two long-term lava lakes that have been active since at least 1967, or possibly since 1906. Source: Gezahegn Yirgu, Department of Earth Sciences, Addis Ababa University Erta Ale Information from the Global Volcanism Program http://www.volcano.si.edu/world/ volcano.cfm?vnum=0201-08= SHIVELUCH Kamchatka Peninsula, Russia 56.653�N, 161.360�E; summit elev. 3,283 m; All times are local (= UTC + 12 hours) KVERT raised the Concern Color Code at Shiveluch from Orange to Red (the highest level) on 22 September . According to interpretations of seismic data, on the 22nd at 1715 a strong eruption began, with ash plumes reaching ~7.5 km (24,600 ft) a.s.l. and hot avalanches and pyroclastic flows descending the volcano's flanks. The pyroclastic flows extended 10-15 km. The strongest seismic signal of the eruption occurred on 22 September at 2259. Shallower signals recorded between 22 September at 2330 and 23 September at 1200 were possibly associated with ash emissions that rose to 3.5 km (11,500 ft) a.s.l. An ash plume was visible on satellite imagery at a height of ~3 km (9,850 ft) a.s.l. extending ~20 km SSW. The Concern Color Code was reduced to Orange on 23 September. Background. The high, isolated massif of Shiveluch volcano (also spelled Sheveluch) rises above the lowlands NNE of the Kliuchevskaya volcano group and forms one of Kamchatka's largest and most active volcanoes. The currently active Molodoy Shiveluch lava-dome complex was constructed during the Holocene within a large horseshoe-shaped caldera formed by collapse of the massive late-Pleistocene Strary Shiveluch volcano. At least 60 large eruptions of Shiveluch have occurred during the Holocene, making it the most vigorous andesitic volcano of the Kuril- Kamchatka arc. Frequent collapses of lava-dome complexes, most recently in 1964, have produced large debris avalanches whose deposits cover much of the floor of the breached caldera. During the 1990s, intermittent explosive eruptions took place from a new lava dome that began growing in 1980. The largest historical eruptions from Shiveluch occurred in 1854 and 1964. Source: Kamchatkan Volcanic Eruption Response Team http://www.avo.alaska.edu/activity/ avoreport.php?view=kaminfo Shiveluch Information from the Global Volcanism Program http://www.volcano.si.edu/gvp/world/ volcano.cfm?vnum=1000-27= Ongoing Activity BAGANA Bougainville Island, Papua New Guinea 6.14�S, 155.19�E; summit elev. 1,750 m Ash was emitted from Bagana during 17-18 September and drifted W and NW. During 14-18 September, incandescence from the volcano was visible at night. On the 18th, observers described what could have been cascading volcanic material detached from a possible active lava flow. Background. Bagana volcano, occupying a remote portion of central Bougainville Island, is one of Melanesia's youngest and most active volcanoes. Bagana is a massive symmetrical lava cone largely constructed by an accumulation of viscous andesitic lava flows. The entire lava cone could have been constructed in about 300 years at its present rate of lava production. Eruptive activity at Bagana is characterized by non-explosive effusion of viscous lava that maintains a small lava dome in the summit crater, although explosive activity occasionally producing pyroclastic flows also occurs. Lava flows form dramatic, freshly preserved tongue-shaped lobes up to 50-m-thick with prominent levees that descend the volcano's flanks on all sides. Source: Rabaul Volcano Observatory Bagana Information from the Global Volcanism Program http://www.volcano.si.edu/world/ volcano.cfm?vnum=0505-02= BARREN ISLAND Andaman Islands, Indian Ocean, India 12.29�N, 93.88�E; summit elev. 354 m; All times are local (= UTC + 5.5 hours) A pilot observed a plume emitted from Barren Island on 23 September around 1230 at a height of ~3 km (10,000 ft) a.s.l., extending ~90 km E. On 27 September, a low-level plume was visible on satellite imagery drifting NE. The current eruption of Barren Island began on 28 May 2005. Background. Barren Island, a possession of India in the Andaman Sea about 135 km NE of Port Blair in the Andaman Islands, is the only historically active volcano along the N-S-trending volcanic arc extending between Sumatra and Burma (Myanmar). The 354-m-high island is the emergent summit of a volcano that rises from a depth of about 2,250 m. The small, uninhabited 3-km-wide island contains a roughly 2-km-wide caldera with walls 250-350 m high. The caldera, which is open to the sea on the W, was created during a major explosive eruption in the late Pleistocene that produced pyroclastic-flow and -surge deposits. The morphology of a fresh pyroclastic cone that was constructed in the center of the caldera has varied during the course of historical eruptions. Lava flows fill much of the caldera floor and have reached the sea along the western coast during eruptions in the 19th century and more recently in 1991 and 1995. Source: Darwin VAAC http://www.bom.gov.au/info/vaac/advisories.shtml Barren Island Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0600-01= COLIMA Western M�xico 19.514�N, 103.62�W; summit elev. ~3,850 m; All times are local (= UTC - 5 hours) During 22-27 September, several small explosions occurred at Colima. The largest explosion took place on 27 September at 0507 and produced a plume to a height of ~3.8 km above the volcano (or 25,100 ft a.s.l.). The plume drifted WSW, depositing small amounts of ash in the cities of Colima, Villa de �lvarez, and Comala more than 30 km from the volcano. Due to the threat of lahars forming on the volcano's flanks, Universidad de Colima advised avoiding the ravines of La Lumbre, San Antonio, Monte Grande (in Colima state), and La Arena (in Jalisco state). Background. The Colima volcanic complex is the most prominent volcanic center of the western Mexican Volcanic Belt. It consists of two southward-younging volcanoes, Nevado de Colima (the 4,320 m high point of the complex) on the N and the historically active Volc�n de Colima on the S. Volc�n de Colima (also known as Volc�n Fuego) is a youthful stratovolcano constructed within a 5- km-wide caldera, breached to the S, that has been the source of large debris avalanches. Major slope failures have occurred repeatedly from both the Nevado and Colima cones, and have produced a thick apron of debris-avalanche deposits on three sides of the complex. Frequent historical eruptions date back to the 16th century. Occasional major explosive eruptions (most recently in 1913) have destroyed the summit and left a deep, steep-sided crater that was slowly refilled and then overtopped by lava dome growth. Source: Universidad de Colima http://www.ucol.mx/volcan/ Colima Information from the Global Volcanism Program http://www.volcano.si.edu/world/ volcano.cfm?vnum=1401-04= KILAUEA Hawaii, USA 19.43�N, 155.29�W; summit elev. 1,222 m During 22-27 September, lava from Kilauea continued to enter the sea at the East Lae`apuki area, and surface lava flows were visible on the Pulama Pali fault scarp. During the report period, background volcanic tremor was near normal levels at Kilauea's summit. Volcanic tremor reached moderate levels at Pu`u `O`o. Small amounts of inflation and deflation occurred at the volcano during the report period. Background. Kilauea, one of five coalescing volcanoes that comprise the island of Hawaii, is one of the world's most active volcanoes. Eruptions at Kilauea originate primarily from the summit caldera or along one of the lengthy E and SW rift zones that extend from the caldera to the sea. About 90% of the surface of Kilauea is formed by lava flows less than about 1,100 years old; 70% of the volcano's surface is younger than 600 years. The latest Kilauea eruption began in January 1983 along the E rift zone. This long-term ongoing eruption from Pu`u `O`o-Kupaianaha has produced lava flows that have traveled 11-12 km from the vents to the sea, paving about 104 km2 of land on the S flank of Kilauea and building more than 200 hectares of new land. Source: US Geological Survey Hawaiian Volcano Observatory http://volcanoes.usgs.gov/ update.html Kilauea information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1302-01- LANGILA New Britain Island, Papua New Guinea 5.53�S, 148.42�E; summit elev. 1,330 m During 12-18 September, Langila's Crater 2 continued to forcefully erupt ash at irregular intervals. The resultant ash plumes drifted NW and W. Incandescence and weak projections of volcanic material were visible on the evening of 13 September. There was no activity at Crater 3. Seismicity was at low levels at the volcano, consisting mainly of low-frequency earthquakes. Background. Langila, one of the most active volcanoes of New Britain, consists of a group of four small overlapping composite cones on the lower eastern flank of the extinct Talawe volcano. Talawe is the highest volcano in the Cape Gloucester area of NW New Britain. A rectangular, 2.5- km-long crater is breached widely to the SE; Langila volcano was constructed NE of the breached crater of Talawe. An extensive lava field reaches the coast on the N and NE sides of Langila. Frequent mild-to-moderate explosive eruptions, sometimes accompanied by lava flows, have been recorded since the 19th century from three active craters at the summit of Langila. The youngest and smallest crater (no. 3 crater) was formed in 1960 and has a diameter of 150 m. Sources Rabaul Volcano Observatory Langila Information from the Global Volcanism Program MANAM offshore New Guinea, Papua New Guinea 4.10�S, 145.06�E; summit elev. 1,807 m During 12-18 September, Manam's Main Crater continued to release weak emissions of ash. For a brief period on the 17th, a moderate amount of ash was emitted. Ash plumes drifted to the NW part of the island. Manam remained at Alert Level "Stage 1." Background. The 10-km-wide island of Manam is one of Papua New Guinea's most active volcanoes. Four large radial valleys extend from the unvegetated summit of the conical 1,807-m- high stratovolcano to its lower flanks. These "avalanche valleys," regularly spaced 90 degrees apart, channel lava flows and pyroclastic avalanches that have sometimes reached the coast. Five satellitic centers are located near the island's shoreline. Two summit craters are present; both are active, although most historical eruptions have originated from the southern crater, concentrating eruptive products during the past century into the SE avalanche valley. Frequent historical eruptions have been recorded since 1616. Source: Rabaul Volcano Observatory http://www.bom.gov.au/info/vaac/advisories.shtml Manam Information from the Global Volcanism Program http://www.volcano.si.edu/world/ volcano.cfm?vnum=0501-02= RABAUL New Britain Island, Papua New Guinea 4.271�S, 152.203�E; summit elev. 688 m During 12-18 September, ash emissions continued at Rabaul caldera's active Tavurvur cone. Ash plumes rose 800-1,500 m above the volcano (or 4,900-7,200 ft a.s.l.) and drifted N and NW, depositing ash in most parts of Rabaul Town and beyond. Projections of incandescent volcanic material were visible at night during strong explosions. Seismicity was at moderate-to-high levels, with most earthquakes associated with ash emissions and explosions. The deformation trend generally reflected uplift. People were discouraged from venturing within 1 km of the erupting vent. Background. The low-lying Rabaul caldera on the tip of the Gazelle Peninsula at the NE end of New Britain forms a broad sheltered harbor. The outer flanks of the 688-m-high asymmetrical pyroclastic shield volcano are formed by thick pyroclastic-flow deposits. The 8 x 14 km caldera is widely breached on the E, where its floor is flooded by Blanche Bay. Two major Holocene caldera- forming eruptions at Rabaul took place as recently as 3,500 and 1,400 years ago. Three small stratovolcanoes lie outside the northern and NE caldera rims. Post-caldera eruptions built basaltic-to-dacitic pyroclastic cones on the caldera floor near the NE and western caldera walls. Several of these, including Vulcan cone, which was formed during a large eruption in 1878, have produced major explosive activity during historical time. A powerful explosive eruption in 1994 occurred simultaneously from Vulcan and Tavurvur volcanoes and forced the temporary abandonment of Rabaul city. Source: Rabaul Volcano Observatory Rabaul Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0502-14= REVENTADOR Ecuador 0.078�S, 77.656�W, summit elev. 3,562 m During 21-27 September, there were intermittent emissions of ash from Reventador, with the highest rising plumes reaching ~8.5 km (28,000 ft) a.s.l. on 24 September. Hot spots were occasionally visible on satellite imagery during the report week. Background. Reventador is the most frequently active of a chain of Ecuadorian volcanoes in the Cordillera Real, well E of the principal volcanic axis. It is a forested stratovolcano that rises above the remote jungles of the western Amazon basin. A 3-km-wide caldera breached to the E was formed by edifice collapse and is partially filled by a young, unvegetated stratovolcano that rises about 1,300 m above the caldera floor. Reventador has been the source of numerous lava flows as well as explosive eruptions that were visible from Quito in historical time. Frequent lahars in this region of heavy rainfall have constructed a debris plain on the eastern floor of the caldera. Source: Washington Volcanic Ash Advisory Center http://www.ssd.noaa.gov/VAAC/messages.html Reventador Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1502-01= SANTA ANA El Salvador 13.853�N, 89.630�W; summit elev. 2,365 m During 21-26 September, seismicity and gas emissions were above normal levels at Santa Ana as they had been since 27 July. Microseismicity remained at relatively high levels. During the report period, gas plumes rose to a maximum height of ~1 km above the volcano (or 11,000 ft a.s.l.) on 26 September. During a visit to the crater on 21 September, observers noted that the summit crater lagoon had become greener and small rock slides occurred in a fumarolic area. Santa Ana remained at Alert Level Yellow Phase 1. Background. Santa Ana, El Salvador's highest volcano, is a massive stratovolcano immediately W of Coatepeque caldera. Collapse of the volcano during the late Pleistocene or early Holocene produced a massive debris avalanche that swept into the Pacific, forming the Acajutla Peninsula. Reconstruction of the volcano rapidly filled the collapse scarp. The broad summit of the volcano is cut by several crescentic craters, and a series of parasitic vents and cones have formed along a 20- km-long fissure system that extends from near the town of Chalchuapa NNW of the volcano to the San Marcelino and Cerro Chino cinder cones on the SE flank. Historical activity, largely consisting of small-to-moderate explosive eruptions from both summit and flank vents, has been documented since the 16th century. The San Marcelino cinder cone on the SE flank produced a lava flow in 1722 that traveled 11 km to the E. Source: Servicio Nacional de Estudios Territoriales http://www.snet.gob.sv/ Santa Ana Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1403-02= SOUFRI�RE HILLS Montserrat, West Indies 16.72�N, 62.18�W; summit elev. 1,052 m Volcanic and seismic activity at Soufri�re Hills remained at elevated levels during 16-23 September. Observations on 20 September suggested that slow lava-dome growth continued. The daily sulfur-dioxide flux averaged 680 metric tons per day (t/d), above the long-term eruption average of 500 t/d. Background. The complex andesitic Soufri�re Hills volcano occupies the southern half of the island of Montserrat. The summit area consists primarily of a series of lava domes emplaced along an ESE-trending zone. Non-eruptive seismic swarms occurred at 30-year intervals in the 20th century, but the first well-documented historical eruption on Montserrat did not take place until 1995. Long-term small-to-moderate ash eruptions were accompanied by lava dome growth and pyroclastic flows that forced evacuation of the southern half of the island and ultimately destroyed the capital city of Plymouth, causing severe social and economic disruption. Source: Montserrat Volcano Observatory http://www.mvo.ms/ Soufri�re Hills Information from the Global Volcanism Program http://www.volcano.si.edu/world/ volcano.cfm?vnum=1600-05= SPURR southwestern Alaska, USA 61.299�N, 152.251�W; summit elev. 3,374 m Seismicity at Spurr during 16-23 September remained above background levels, but the overall rate continued to gradually decline. Preliminary data from a gas-sensing flight earlier in the week showed a substantial reduction in gas emissions compared to previous measurements taken in May 2005. The declining seismicity, reduced gas emission, and the changing summit-lake color (thought to reflect lower levels of acidity), all suggested a reduced level of volcanic activity. Minor steaming continued from the summit "melt pit" and occasionally from Crater Peak. Spurr remained at Concern Color Code Yellow . Background. The 3,374-m-high summit of Mount Spurr, the highest volcano of the Aleutain arc, is a large lava dome constructed at the center of a roughly 5-km-wide horseshoe-shaped caldera that is open to the S. The volcano lies 130 km W of Anchorage, NE of Chakachamna Lake. The caldera was formed by a late-Pleistocene or early Holocene debris avalanche and associated pyroclastic flows that destroyed an ancestral Spurr volcano. The debris avalanche traveled more than 25 km to the SE, and the resulting deposit contains blocks as large as 100 m in diameter. Several ice-carved post-caldera cones or lava domes lie in the center of the caldera. The youngest vent, 2,309-m-high Crater Peak, formed at the southern breached end of the caldera and has been the source of about 40 identified Holocene tephra layers. Spurr's two historical eruptions, from Crater Peak in 1953 and 1992, deposited ash on the city of Anchorage. Source: Alaska Volcano Observatory http://www.avo.alaska.edu/avo4/updates/updates.htm Spurr Information from the Global Volcanism Program http://www.volcano.si.edu/world/ volcano.cfm?vnum=1103-04- ST. HELENS Washington, USA 46.20�N, 122.18�W; summit elev. 2,549 m Growth of the new lava dome inside the crater of Mount St. Helens continued during 21-26 September, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. There were no significant changes in seismicity or deformation during the report period. Time-series images showed that the active northwestern portion of the new lava dome continued to move westward into the W arm of a glacier, spawning rockfalls. St Helens remained at Volcano Advisory (Alert Level 2); aviation color code Orange. Background. Prior to 1980, Mount St. Helens formed a conical, youthful volcano sometimes known as the Fuji-san of America. During the 1980 eruption the upper 400 m of the summit was removed by slope failure, leaving a 2 x 3.5 km horseshoe-shaped crater now partially filled by a lava dome. Mount St. Helens was formed during nine eruptive periods beginning about 40-50,000 years ago, and has been the most active volcano in the Cascade Range during the Holocene. The modern edifice was constructed during the last 2,200 years, when the volcano produced basaltic as well as andesitic and dacitic products from summit and flank vents. Historical eruptions in the 19th century originated from the Goat Rocks area on the N flank, and were witnessed by early settlers. Source: USGS Cascades Volcano Observatory http://vulcan.wr.usgs.gov/Volcanoes/MSH/ CurrentActivity/framework.html St. Helens Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1201-05- SUWANOSE-JIMA Ryukyu Islands, Japan 29.53�N, 129.72�E; summit elev. 799 m Based on information from JMA, the Tokyo VAAC reported that an emission from Suwanose-jima on 22 September reached a height of ~1.8 km (6,000 ft) a.s.l. and drifted W. Ash was not visible on satellite imagery. Background. The 8-km-long, spindle-shaped island of Suwanose-jima in the northern Ryukyu Islands consists of an andesitic stratovolcano with two historically active summit craters. Only about 50 persons live on the sparsely populated island. The summit of the volcano is truncated by a large breached crater extending to the sea on the E flank that was formed by edifice collapse. Suwanose-jima, one of Japan's most frequently active volcanoes, was in a state of intermittent strombolian activity from On-take, the NE summit crater, that began in 1949 and lasted nearly a half century. The largest historical eruption took place in 1813-14, when thick scoria deposits blanketed residential areas, after which the island was uninhabited for around 70 years. The SW crater produced lava flows that reached the western coast in 1813, and lava flows reached the eastern coast of the island in 1884. Source: Tokyo Volcanic Ash Advisory Center http://www.ssd.noaa.gov/VAAC/OTH/JP/ messages.html Suwanose-jima Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0802-03= TUNGURAHUA Ecuador 1.47�S, 78.44�W; summit elev. 5,023 m During 21-26 September, volcanic activity at Tungurahua remained at low levels with small emissions of steam, gas, and variable ash content. A small amount of ash fell in the towns of Cus�a (NW) and Bilbao (8 km W of the volcano) during the morning of 21 September. Fumaroles on the outer edge of the crater were visible from Runt�n after not being seen for 6 months. Steam- and-gas plumes rose ~ 1 km above the volcano (or 19,800 ft a.s.l.) and drifted W. Background. The steep-sided Tungurahua stratovolcano towers more than 3 km above its northern base. It sits ~140 km S of Quito, Ecuador's capital city, and is one of Ecuador's most active volcanoes. Historical eruptions have been restricted to the summit crater. They have been accompanied by strong explosions and sometimes by pyroclastic flows and lava flows that reached populated areas at the volcano's base. The last major eruption took place from 1916 to 1918, although minor activity continued until 1925. The latest eruption began in October 1999 and prompted temporary evacuation of the town of Ba�os on the N side of the volcano. Source: Instituto Geofisico-Escuela Poltecnica Nacional http://www.igepn.edu.ec/vulcanologia/ tungurahua/actividad/informet.htm Tungurahua Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1502-08= VENIAMINOF Alaska Peninsula, USA 56.17�N, 159.38�W; summit elev. 2,507 m Cloudy weather during 16-23 September prohibited web camera and satellite observations of Veniaminof, but seismic data indicated diminishing activity. Some minor ash emissions may have occurred, with diffuse ash plumes rising less than ~3 km (10,000 ft) a.s.l. Veniaminof remained at Concern Color Code Yellow . Background. Massive Veniaminof volcano, one of the highest and largest volcanoes on the Alaska Peninsula, is truncated by a steep-walled, 8 x 11 km, glacier-filled caldera that formed around 3,700 years ago. The caldera rim is up to 520 m high on the N, is deeply notched on the W by Cone Glacier, and is covered by an ice sheet on the S. Post-caldera vents are located along a NW- SE zone bisecting the caldera that extends 55 km from near the Bering Sea coast, across the caldera, and down the Pacific flank. Historical eruptions probably all originated from the westernmost and most prominent of two intra-caldera cones, which reaches an elevation of 2,156 m and rises about 300 m above the surrounding icefield. The other cone is larger, and has a summit crater or caldera that may reach 2.5 km in diameter, but is more subdued and barely rises above the glacier surface. Source: Alaska Volcano Observatory http://www.avo.alaska.edu/avo4/updates/updates.htm Veniaminof Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1102-07-

Thousands evacuated as El Salvador volcano erupts; two dead (Update) El Salvador's largest volcano, dormant for more than a century, shook the ground as it woke up, hurling out hot rocks, killing at least two and forcing more than 2,000 to flee. The Santa Ana or Ilamatepec volcano, located 66 kilometers (41 miles) west of the capital, rumbled and belched thick plumes of ash that reached more than 15 kilometers (nine miles) into the sky Saturday morning. Military emergency sirens blasted, calling for an immediate area evacuation of the hamlets in the coffee growing area, and soon after the volcano began hurling glowing rocks and ash from its crater. The volcano "has begun to expel magma on the side of the town of San Blas, while the ash is being carried by a south-southwesterly wind," the University of El Salvador vulcanologist Francisco Barahona said. Officials with the National Emergency Committee said that by 1 p.m. (1900 GMT), 2,250 people had been evacuated from the danger zone. Hot rocks belched out by the volcano ranged from the size of a football to the size of a car, an AFP journalist on the scene reported. At least seven people were injured by red hot rocks spewed into the air by the eruption, the national police said. Two people were killed when 200 residents fled the hamlet of Palo Campana, located just two kilometers (1.2 miles) from the crater, said Interior Minister Rene Figueroa. The eruption triggered a landslide of boiling mud and water from a crater lake that rushed down onto Palo Campana from three directions, authorities said. Interior Ministry officials declared a red alert in a four kilometer (2.5 mile) radius around the volcano. A lesser "yellow alert" was issued for adjacent areas. Some 20,000 people live in the area surrounding the volcano. President Antonio Saca called on El Salvadorans to remain calm, describing the eruption as one of "moderate magnitude." The country's civil protection forces have been deployed and are operational, he said. Saca said he understood many people had never seen a volcano erupting and would like to get close to observe the phenomenon. "This is not a game," he warned. "This could represent danger since we are not discounting another eruption." At 2,381 meters (7,812 feet) above sea level, the Santa Ana volcano is the highest point in El Salvador. It last erupted in 1904. The volcano has been rumbling since mid-August, but had been quiet since Thursday, said Elda Godoy with the government office that monitors seismic and volcanic activity. She described Saturday's eruption as "abrupt." Similar eruptions could occur in the next days or weeks, Godoy said, warning of possible landslides due to the weak rain-soaked ground. Santa Ana, the country's second largest city with a population 100,000 and located 40 kilometers (25 miles) from the volcano, was not affected, officials said. � 2005 AFP

SALVADOR - Santa Ana volcano October 3rd, 2005 As of 3rd of October SNET reports that following Saturday explosive activity the volcano was quiet during Sunday. As of 1st of October SNET reported that following past days of important seismicity an eruption started on Saturday morning. Explosive activity occured with lava incandescent materiel ejection and (unconfirmed lava flow on South flank ? ). The volcano plume reached about 15 km elevation. Important ashfalls occured around the volcano and the poplation living near the volcano was rapidly evacuated. The eruption triggered a hot mudflow from the summital crater lake that rushed onto the hamlet of Palo Campana located about 2 km from the crater. Rocks and ash rained down on the village in the coffee growing area. Preliminary information report that two people died and seven people were injured by incandecent rocks spewed into the air during explosive activity. The color alert code is red. A radius danger zone of 4 km was established by the local autority. (further details as soon as possible). As of he 28th of September, the Servicio Nacional de Estudios Territoriales (SNET), was reported that the micro-seismicity was maintained in high ranks, with the tendency al increment observed in the last days. The daily average of RSAM (Measurement of the Seismic Amplitude in Real Time) of the day of yesterday, finally was of 93.1 units and even the first hours of this day, they had values between 75 and 115 units, being registered an average of 93.9. The vibration (tremor) has intensified moderate and he is presented in intermittent periods of an hour or hour and a half of duration, spaced for periods without vibration from 1 to 2 hours. The volcano has not registered earthquakes senses by the population. According to information facilitated by park ranger of Salvanatura, in hours in the afternoon of yesterday a column of vertical, thick gases and of height over the 1000 meters could be observed. Also notification of settlers of the Palo Campana sector and of the same park ranger on the observation of incandesc nce on the edge of the crater was received. First thing in the morning of this morning a weaker column of gases was observed, of some 200 meters of height, directed toward the south-southwestern one. Subsequently the conditions of cloudiness have not permitted to carry out more observations.technical of the SNET they carry out the day of today visits al crater of the volcano. In the Sulfur Dioxide flow measurements (SO2) carried out the day of yesterday, Monday the 26th, by the research team of the University of El Salvador a data of 2 thousand 708 tons was obtained for day. The measurements were carried out again in the traveled through (transecting) habitual that goes from Sonsonate to the Los Naranjos, in the Western sector of the volcano. Today technicians of the SNET will take a new sample in Cerro Pach. Satellite images were not possible, to obtain information, due to the conditions of cloudiness. The activity of the volcano continues above its normal behaviour base line. The seismicity registered in he last 48 hours does not present significant variations, but the tendency is confirmed al raises that has come itself declaring gradually in the last week and especially since on the 24. The vibration (tremor) has intensified moderate for periods intermittent of an hour or hour and a half. The sulfur dioxide flow data (SO2) measured in the day of yesterday present also a tendency al raises. SNET reported a significant increase in seismic activity at Santa Ana (also called Ilamatepec) on the night of 27 August. A cluster of 17 volcano-tectonic earthquakes were recorded, with four located S of the volcano. Afterwards, continuous high-frequency tremor was recorded until at least 30 August. Observations made on 29 August revealed incandescent rocks in the fumarole field. The incandescence was due to the hot gases emitted from the fumaroles heating the rocks. A significant increase in sulfur-dioxide emission was recorded, and gas-and-steam plumes rose 500-1,000 m above the volcano's crater (or 9,400-11,000 ft a s.l.). As a safety measure, access to the volcano's crater was restricted to visitors. Prior to the current increase in activity, strong degassing had been measured at the volcano since June 2004. An ash emission occurred on 16 June 2005, and a slight increase in seismicity and a significant increase in gas emission was measured from 27 July until at least 30 August. Santa Ana, El Salvador's highest volcano, is a massive stratovolcano (2365 m) immediately W of Coatepeque caldera about 65 km of San Salvador. Collapse of the volcano during the late Pleistocene or early Holocene produced a massive debris avalanche that swept into the Pacific, forming the Acajutla Peninsula.Previous historic activity occured in 1904. http://www.sveurop.org/gb/news/news.htm

I see Mount St Helens also erupted - not dangerously but definitely erupted.

the cam is still up and running? i haven't been there for awhile....marcia, do you miss having the volcano so near? (aside from the danger) i HATED L.A. but there are certain things that i miss, tidepools, the weather, seeing whales migrate, new cars on the freeways (new car models, had to clarify so others don't think i live under a rock where all we have are old cars *grin*)

I miss Hawaii not even slightly. It is as DB saw it, a third world country with scenery. If you live there, the aloha spirit is reserved for visitors with money. NO, there is not much I miss other than spam musubi on occasion. I really like it here. The people are real Americans and are as charming as southern hospitality allows. But I do miss a volcano. However, my first love was archaeology and not geology. If I can only go a little trip I do not miss the volcano at all. Besides, it is a five mile hike - each way - to see any lava that is moving. But, thanks for asking. We're glad to have you back. I miss the ocean a bit, but it too is dangerous and I am happy not to be on disaster relief call 24/7 anymore.

********************************************* GVP/USGS Weekly Volcanic Activity Report 28 September- 4 October 2005 ********************************************* From: Gari Mayberry http://www.volcano.si.edu/reports/usgs/ New Activity: | Erta Ale, Ethiopia | Santa Ana, El Salvador Ongoing Activity: | Barren Island, Andaman Islands | Cayambe, Ecuador | Colima, M�xico | Dukono, Indonesia | Kilauea, USA | Manam, Papua New Guinea | Reventador, Ecuador | Shiveluch, Russia | Soufri�re Hills, Montserrat | St. Helens, USA | Tungurahua, Ecuador | Veniaminof, USA New Activity/Unrest ERTA ALE Ethiopia 13.60�N, 40.67�E; summit elev. 613 m A group of scientists assessed the visible changes at Erta Ale on 26 September after activity began around 24 September. In comparison to observations made in November 2004, they found that the southern main crater/pit had widened significantly, with portions of the previous crater walls having collapsed into the lava lake. A new cone-shaped construct had grown within the southern main crater where there had been a platform. A lava lake occupied the entire width of the inner crater/pit. In the northern crater/pit, there was a solidified lava bulge and abundant �smoking� along the crater walls. No incandescent lava was visible in the pit. Based on descriptions by local residents of seeing �red and glowing light shooting and rising into the air above the volcano,� the scientists believe that a Strombolian eruption probably occurred, emitting a significant volume of fresh magma within, and possibly out of, the pit. According to news reports, about 50,000 nomads in Ethiopia�s Afar region were displaced after the eruption. Background. Erta Ale is an isolated basaltic shield volcano that is the most active volcano in Ethiopia. The broad, 50-km-wide volcano rises more than 600 m from below sea level in the barren Danakil depression. Erta Ale is the namesake and most prominent feature of the Erta Ale Range. The 613-m-high volcano contains a 0.7 x 1.6 km, elliptical summit crater housing steep-sided pit craters. Another larger 1.8 x 3.1 km wide depression elongated parallel to the trend of the Erta Ale range is located to the SE of the summit and is bounded by curvilinear fault scarps on the SE side. Fresh-looking basaltic lava flows from these fissures have poured into the caldera and locally overflowed its rim. The summit caldera is renowned for one, or sometimes two long-term lava lakes that have been active since at least 1967, or possibly since 1906. Source: Gezahegn Yirgu, Department of Earth Sciences, Addis Ababa University, Agence France-Presse http://news.yahoo.com/news? tmpl=story&u=/afp/20051003/sc_afp/ethiopiaquakevolcano_051003190655 Erta Ale Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0201-08= SANTA ANA El Salvador 13.853�N, 89.630�W; summit elev. 2,365 m; All times are local (= UTC � 6 hours) SNET reported that a sudden eruption at Santa Ana (also called Ilamatepec) on 1 October around 0820 produced an ash-and-gas plume to a height of ~10 km above the volcano (or 40,600 ft a.s.l.). According to the Washington VAAC, ash was visible on satellite imagery at a height of ~14 km (46,000 ft) a.s.l. Ash fell in towns W of the volcano, including in Naranjos, Nahuizalco, Juay�a, Ahuachap�n, and La Hachadura. Volcanic blocks up to a meter in diameter fell as far as 2 km S of the volcano�s crater. Lahar deposits were seen SE of the volcano. The Alert Level within a 4-km radius around the volcano�s central crater was raised to Red, the highest level. According to news reports, two people were killed by landslides (possibly caused by heavy rain in the area) in the town of Palo Campana, and thousands of residents near the volcano were evacuated. As many as 1,400 hectares of crops were damaged by ash. Prior to the eruption, significant changes in seismicity were not noted. On 3 October, after the eruption, seismicity fluctuated and small explosions occasionally occurred. Earthquakes associated with explosions were recorded. In addition, there was a decrease in the amount of sulfur dioxide emitted from the volcano. SNET noted that eruptive activity could continue at the volcano. Background. Santa Ana, El Salvador's highest volcano, is a massive stratovolcano immediately W of Coatepeque caldera. Collapse of the volcano during the late Pleistocene or early Holocene produced a massive debris avalanche that swept into the Pacific, forming the Acajutla Peninsula. Reconstruction of the volcano rapidly filled the collapse scarp. The broad summit of the volcano is cut by several crescentic craters, and a series of parasitic vents and cones have formed along a 20-km-long fissure system that extends from near the town of Chalchuapa NNW of the volcano to the San Marcelino and Cerro Chino cinder cones on the SE flank. Historical activity, largely consisting of small-to-moderate explosive eruptions from both summit and flank vents, has been documented since the 16th century. The San Marcelino cinder cone on the SE flank produced a lava flow in 1722 that traveled 11 km to the E. Source: Servicio Nacional de Estudios Territoriales http://www.snet.gob.sv/, Reuters http://in.today.reuters.com/news/newsArticle.aspx? type=worldNews&storyID=2005-10-03T071921Z_01_NOOTR_RTRJONC_0_India-218031- 1.xml&archived=False, Associated Press http://news.yahoo.com/news? tmpl=story&u=/ap/20051002/ap_on_re_la_am_ca/salvador_volcano_4, ReliefWeb http://www.reliefweb.int/rw/RWB.NSF/db900SID/EVOD-6GUERZ?OpenDocument Santa Ana Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1403-02= Ongoing Activity BARREN ISLAND Andaman Islands, Indian Ocean, India 12.29�N, 93.88�E; summit elev. 354 m Low-level plumes from Barren Island were visible on satellite imagery on 28 September and 2 October. The current eruption of Barren Island began on 28 May 2005. Background. Barren Island, a possession of India in the Andaman Sea about 135 km NE of Port Blair in the Andaman Islands, is the only historically active volcano along the N-S-trending volcanic arc extending between Sumatra and Burma (Myanmar). The 354-m-high island is the emergent summit of a volcano that rises from a depth of about 2,250 m. The small, uninhabited 3-km-wide island contains a roughly 2-km-wide caldera with walls 250-350 m high. The caldera, which is open to the sea on the W, was created during a major explosive eruption in the late Pleistocene that produced pyroclastic-flow and - surge deposits. The morphology of a fresh pyroclastic cone that was constructed in the center of the caldera has varied during the course of historical eruptions. Lava flows fill much of the caldera floor and have reached the sea along the western coast during eruptions in the 19th century and more recently in 1991 and 1995. Source: Darwin VAAC http://www.bom.gov.au/info/vaac/advisories.shtml Barren Island Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0600-01= CAYAMBE Ecuador 0.029�N, 77.986�W; summit elev. 5790 m A cluster of earthquakes that had been recorded at Cayambe since 16 September, with about 300 small earthquakes occurring during 16-18 September, decreased in number significantly after 19 September. During 19-25 September, an average of 5.3 earthquakes occurred daily. Background. The massive compound Cayambe stratovolcano is located on the isolated western edge of the Cordillera Real. The 5,790-m-high volcano, whose southern flank lies astride the equator, is capped by glaciers, which descend down to 4,200 m on the eastern Amazonian side. The modern Nevado Cayambe volcano, constructed to the E of an older volcanic complex, contains two summit lava domes located about 1.5 km apart, the western of which is the highest. Several other lava domes on the upper flanks have been the source of pyroclastic flows that reached the lower flanks of the volcano. A prominent Holocene pyroclastic cone on the lower eastern flank fed thick lava flows that traveled about 10 km to the E. Nevado Cayambe was recently discovered to have produced frequent explosive eruptions during the Holocene, and to have had a single historical eruption, during 1785-86. Source: Instituto Geof�sico-Escuela Polit�cnica Nacional http://www.igepn.edu.ec/vulcanologia/cayambe/actividad/informec.htm Cayambe Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1502-004 COLIMA Western M�xico 19.514�N, 103.62�W; summit elev. ~3,850 m During 28 September to 3 October, several small explosions occurred at Colima. Based on information from the Mexico City MWO, the Washington VAAC reported that a plume was emitted on 28 September that rose to a height of ~6.1 km (20,000 ft) a.s.l. and drifted NNW. Background. The Colima volcanic complex is the most prominent volcanic center of the western Mexican Volcanic Belt. It consists of two southward-younging volcanoes, Nevado de Colima (the 4,320 m high point of the complex) on the N and the historically active Volc�n de Colima on the S. Volc�n de Colima (also known as Volc�n Fuego) is a youthful stratovolcano constructed within a 5-km- wide caldera, breached to the S, that has been the source of large debris avalanches. Major slope failures have occurred repeatedly from both the Nevado and Colima cones, and have produced a thick apron of debris-avalanche deposits on three sides of the complex. Frequent historical eruptions date back to the 16th century. Occasional major explosive eruptions (most recently in 1913) have destroyed the summit and left a deep, steep-sided crater that was slowly refilled and then overtopped by lava dome growth. Sources: Universidad de Colima http://www.ucol.mx/volcan/, Washington Volcanic Ash Advisory Center http://www.ssd.noaa.gov/VAAC/messages.html Colima Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1401-04= DUKONO Halmahera, Indonesia 1.70�N, 127.87�E; summit elev. 1,185 m A thin low-level plume from Dukono was visible on satellite imagery on 28 September extending NE. Background. Reports from this remote volcano in northernmost Halmahera are rare, but Dukono has been one of Indonesia's most active volcanoes. More-or- less continuous explosive eruptions, sometimes accompanied by lava flows, occurred since 1933 until at least the mid-1990s, when routine observations were curtailed. During a major eruption in 1550, a lava flow filled in the strait between Halmahera and the N-flank cone of Gunung Mamuya. Dukono is a complex volcano presenting a broad, low profile with multiple summit peaks and overlapping craters. Malupang Wariang, 1 km SW of Dukono's summit crater complex, contains a 700 x 570 m crater that has also been active during historical time. Source: Darwin Volcanic Ash Advisory Center http://www.bom.gov.au/info/vaac/advisories.shtml Dukono Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0608-01= KILAUEA Hawaii, USA 19.43�N, 155.29�W; summit elev. 1,222 m During 28 September- 2 October, lava from Kilauea continued to enter the sea at the East Lae`apuki area, and surface lava flows were visible on the Pulama Pali fault scarp. During the report period, background volcanic tremor was near normal levels at Kilauea's summit. Volcanic tremor reached moderate levels at Pu`u `O`o. Small amounts of inflation and deflation occurred at the volcano during the report period. Background. Kilauea, one of five coalescing volcanoes that comprise the island of Hawaii, is one of the world�s most active volcanoes. Eruptions at Kilauea originate primarily from the summit caldera or along one of the lengthy E and SW rift zones that extend from the caldera to the sea. About 90% of the surface of Kilauea is formed by lava flows less than about 1,100 years old; 70% of the volcano's surface is younger than 600 years. The latest Kilauea eruption began in January 1983 along the E rift zone. This long-term ongoing eruption from Pu`u `O`o-Kupaianaha has produced lava flows that have traveled 11-12 km from the vents to the sea, paving about 104 km2 of land on the S flank of Kilauea and building more than 200 hectares of new land. Source: US Geological Survey Hawaiian Volcano Observatory http://volcanoes.usgs.gov/update.html Kilauea information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1302-01- MANAM offshore New Guinea, Papua New Guinea 4.10�S, 145.06�E; summit elev. 1,807 m On 1 October, a pilot observed ash from Manam below a height of ~3 km (10,000 ft) a.s.l. extending NW. Ash was not visible on satellite imagery. Background. The 10-km-wide island of Manam is one of Papua New Guinea's most active volcanoes. Four large radial valleys extend from the unvegetated summit of the conical 1,807-m-high stratovolcano to its lower flanks. These "avalanche valleys," regularly spaced 90 degrees apart, channel lava flows and pyroclastic avalanches that have sometimes reached the coast. Five satellitic centers are located near the island's shoreline. Two summit craters are present; both are active, although most historical eruptions have originated from the southern crater, concentrating eruptive products during the past century into the SE avalanche valley. Frequent historical eruptions have been recorded since 1616. Source: Darwin Volcanic Ash Advisory Center http://www.bom.gov.au/info/vaac/advisories.shtml Manam Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0501-02= REVENTADOR Ecuador 0.078�S, 77.656�W, summit elev. 3,562 m During 19-25 September, several small explosions occurred at Reventador. An explosion on 20 September produced an ash plume to a height of ~5.8 m (19,000 ft) a.s.l. Small amounts of ash fell in the towns of El Chaco, San Francisco de Borja, and Baeza. During the report week, there was a reduction in the number of earthquakes at the volcano. Background. Reventador is the most frequently active of a chain of Ecuadorian volcanoes in the Cordillera Real, well E of the principal volcanic axis. It is a forested stratovolcano that rises above the remote jungles of the western Amazon basin. A 3-km-wide caldera breached to the E was formed by edifice collapse and is partially filled by a young, unvegetated stratovolcano that rises about 1,300 m above the caldera floor. Reventador has been the source of numerous lava flows as well as explosive eruptions that were visible from Quito in historical time. Frequent lahars in this region of heavy rainfall have constructed a debris plain on the eastern floor of the caldera. Source: Instituto Geofisico-Escuela Poltecnica Nacional http://www.igepn.edu.ec/ Reventador Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1502-01= SHIVELUCH Kamchatka Peninsula, Russia 56.653�N, 161.360�E; summit elev. 3,283 m Growth of Shiveluch�s lava dome and heightened seismicity continued at the volcano during 23-30 September. Weak gas-and-steam plumes, thermal anomalies at the lava dome, and new pyroclastic-flow deposits, were noted during the report week. Shiveluch remained at Concern Color Code Orange . Background. The high, isolated massif of Shiveluch volcano (also spelled Sheveluch) rises above the lowlands NNE of the Kliuchevskaya volcano group and forms one of Kamchatka's largest and most active volcanoes. The currently active Molodoy Shiveluch lava-dome complex was constructed during the Holocene within a large horseshoe-shaped caldera formed by collapse of the massive late- Pleistocene Strary Shiveluch volcano. At least 60 large eruptions of Shiveluch have occurred during the Holocene, making it the most vigorous andesitic volcano of the Kuril-Kamchatka arc. Frequent collapses of lava-dome complexes, most recently in 1964, have produced large debris avalanches whose deposits cover much of the floor of the breached caldera. During the 1990s, intermittent explosive eruptions took place from a new lava dome that began growing in 1980. The largest historical eruptions from Shiveluch occurred in 1854 and 1964. Source: Kamchatkan Volcanic Eruption Response Team http://www.avo.alaska.edu/activity/avoreport.php?view=kaminfo Shiveluch Information from the Global Volcanism Program http://www.volcano.si.edu/gvp/world/volcano.cfm?vnum=1000-27= SOUFRI�RE HILLS Montserrat, West Indies 16.72�N, 62.18�W; summit elev. 1,052 m Volcanic and seismic activity at Soufri�re Hills remained at elevated levels during 23-30 September. Slow lava-dome growth continued at the volcano. The daily sulfur-dioxide flux averaged 950 metric tons per day (t/d), above the long-term eruption average of 500 t/d. Background. The complex dominantly andesitic Soufri�re Hills volcano occupies the southern half of the island of Montserrat. The summit area consists primarily of a series of lava domes emplaced along an ESE-trending zone. English's Crater, a 1-km-wide crater breached widely to the east, was formed during an eruption about 4000 years ago in which the summit collapsed, producing a large submarine debris avalanche. Block-and-ash flow and surge deposits associated with dome growth predominate in flank deposits at Soufri�re Hills. Non-eruptive seismic swarms occurred at 30-year intervals in the 20th century, but with the exception of a 17th-century eruption that produced the Castle Peak lava dome, no historical eruptions were recorded on Montserrat until 1995. Long-term small-to-moderate ash eruptions beginning in that year were later accompanied by lava-dome growth and pyroclastic flows that forced evacuation of the southern half of the island and ultimately destroyed the capital city of Plymouth, causing ajor social and economic disruption. Source: Montserrat Volcano Observatory http://www.mvo.ms/ Soufri�re Hills Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1600-05= ST. HELENS Washington, USA 46.20�N, 122.18�W; summit elev. 2,549 m Growth of the new lava dome inside the crater of Mount St. Helens continued during 28 September to 4 October, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. There were no significant changes in seismicity or deformation during the report period and the level of eruptive activity remained similar to previous weeks. Reanalysis of late September time-series photographs of the active part of the new lava dome indicated that points on the dome moved northwestward and upward at about 5.5 meters per day as extrusion continued. St Helens remained at Volcano Advisory (Alert Level 2); aviation color code Orange. Background. Prior to 1980, Mount St. Helens formed a conical, youthful volcano sometimes known as the Fuji-san of America. During the 1980 eruption the upper 400 m of the summit was removed by slope failure, leaving a 2 x 3.5 km horseshoe-shaped crater now partially filled by a lava dome. Mount St. Helens was formed during nine eruptive periods beginning about 40-50,000 years ago, and has been the most active volcano in the Cascade Range during the Holocene. The modern edifice was constructed during the last 2,200 years, when the volcano produced basaltic as well as andesitic and dacitic products from summit and flank vents. Historical eruptions in the 19th century originated from the Goat Rocks area on the N flank, and were witnessed by early settlers. Source: USGS Cascades Volcano Observatory http://vulcan.wr.usgs.gov/Volcanoes/MSH/CurrentActivity/framework.html St. Helens Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1201-05- TUNGURAHUA Ecuador 1.47�S, 78.44�W; summit elev. 5,023 m During 28 September to 3 October, volcanic activity at Tungurahua remained at low levels with small emissions of steam, gas, and variable ash content. A pilot reported an ash plume on 29 September at a height of ~6.1 km (20,000 ft) a.s.l. Background. The steep-sided Tungurahua stratovolcano towers more than 3 km above its northern base. It sits ~140 km S of Quito, Ecuador�s capital city, and is one of Ecuador's most active volcanoes. Historical eruptions have been restricted to the summit crater. They have been accompanied by strong explosions and sometimes by pyroclastic flows and lava flows that reached populated areas at the volcano's base. The last major eruption took place from 1916 to 1918, although minor activity continued until 1925. The latest eruption began in October 1999 and prompted temporary evacuation of the town of Ba�os on the N side of the volcano. Source: Instituto Geofisico-Escuela Poltecnica Nacional http://www.igepn.edu.ec/ Tungurahua Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1502-08= VENIAMINOF Alaska Peninsula, USA 56.17�N, 159.38�W; summit elev. 2,507 m AVO decreased the Concern Color Code at Veniaminof from Yellow to Green (the lowest level) on 28 September after seismicity at the volcano had been at background levels for over a week and there was no evidence to suggest that minor ash explosions were continuing . Background. Massive Veniaminof volcano, one of the highest and largest volcanoes on the Alaska Peninsula, is truncated by a steep-walled, 8 x 11 km, glacier-filled caldera that formed around 3,700 years ago. The caldera rim is up to 520 m high on the N, is deeply notched on the W by Cone Glacier, and is covered by an ice sheet on the S. Post-caldera vents are located along a NW-SE zone bisecting the caldera that extends 55 km from near the Bering Sea coast, across the caldera, and down the Pacific flank. Historical eruptions probably all originated from the westernmost and most prominent of two intra-caldera cones, which reaches an elevation of 2,156 m and rises about 300 m above the surrounding icefield. The other cone is larger, and has a summit crater or caldera that may reach 2.5 km in diameter, but is more subdued and barely rises above the glacier surface. Source: Alaska Volcano Observatory http://www.avo.alaska.edu/avo4/updates/updates.htm Veniaminof Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1102-07-

Eruption - Piton de la Fournaise October 5th, 2005 After four months of almost continuous inflation and increased seismicity, Piton de la Fournaise started a new eruption on oct 4th at 14h26 local time. It was preceded by a 56 minutes long seismic crisis and strong summit inflation, the latter recorded by our tiltmeter and extensometer network. The eruption occured inside of Dolomieu crater at the same site as the December 2002 pit crater and the Mai-June 2003 eruption. Intensity of eruption is quite small and pahoehoe lava flow covers a small surface in the western part of Dolomieu crater. Thomas Staudacher Observatoire volcanologique du Piton de la Fournaise

******************************************* GVP/USGS Weekly Volcanic Activity Report 12-18 October 2005 ******************************************* http://www.volcano.si.edu/reports/usgs/ New Activity: | Dabbahu, Ethiopia | Garbuna Group, Papua New Guinea Ongoing Activity: | Cleveland, USA | Dukono, Indonesia | Erebus, Antarctica | Karangetang, Indonesia | Kilauea, USA | Michael, Antarctica | Montagu Island, South Sandwich Islands | Sangay, Ecuador | San Miguel, El Salvador | Santa Ana, El Salvador | Soufri�re Hills, Montserrat | St. Helens, USA | Stromboli, Italy | Tanaga, USA New Activity/Unrest DABBAHU Ethiopia 12.60�N, 40.48�E; summit elev. 1,442 m; All times are local (= UTC + 3 hours) Volcanic activity at Erta Ale discussed in the 5-11 October 2005 Weekly Volcanic Activity Report actually occurred at Dabbahu. The correct report is below. A team of scientists visited the Da'Ure locality immediately adjacent to the NE flank of the Quaternary Dabbahu (or Boina) felsic complex on 4 and 5 October after receiving reports of volcanic activity there on 26 September. People in the area noted that on 26 September at about 1300 a very strong earthquake shook the area, and was followed by a dark column of "smoke" that rose high into the atmosphere and spread out to form a cloud, which darkened the area for 3 days and 3 nights. The scientists determined that a minor explosive eruption occurred from two semi-circular vents, producing ashfall that was ~5 cm thick near the vent. Ash deposits extended more than 500 m from the vent. Boulders emitted during the eruption were as large as 3 m and were deposited as far as 20 meters away. The scientists noted intense degassing from the vents, the scent of sulfur dioxide, and the sound of boiling water in the vents. As of about 10 October, the Addis Ababa University Geophysical Observatory reported that seismic a tivity in the area was continuing. Background. Dabbahu, also known as Boina or Moina, is a Holocene volcanic massif forming an axial range of the Afar depression SSW of the Alayta massif. Pantelleritic obsidian flows, lava domes, and pumice cones form the summit and upper flanks of the volcano, which rises above the Teru Plain and was built over a base of basaltic-to-trachytic lava flows of a shield volcano. Late- stage basaltic fissure eruptions occurred at the NW base of the volcano. Abundant fumaroles are located along the crest of the volcano and extend NE towards Alayta. Source: Gezahegn Yirgu, Department of Earth Sciences, Addis Ababa University Dabbahu Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0201-113 GARBUNA GROUP New Britain, Papua New Guinea 5.45�S, 150.03�E; summit elev. 564 m; All times are local (= UTC + 10 hours) RVO reported that an eruption began at Garbuna on the afternoon of 16 October when "white vapor" rose above the volcano and a couple of felt earthquakes occurred. On 17 October, an eruption column rose 3-4 km above the volcano's summit (or 11,700-15,000 ft a.s.l.). At 1100 fine ash fell on the W and NW sides of the volcano, covering two plantations. Water sources originating from Garbuna were affected by the eruption. According to RVO, the volcano last erupted about 1,700 years ago. Background. The basaltic-to-dacitic Garbuna volcano group consists of three volcanic peaks, Krummel, Garbuna, and Welcker. They are located along a 7-km N- S line above a shield-like foundation at the southern end of the Willaumez Peninsula. The central and lower peaks of the centrally located Garbuna volcano contain a large vegetation-free area that is probably the most extensive thermal field in Papua New Guinea. A prominent lava dome and blocky lava flow in the center of thermal area have resisted destruction by thermal activity, and may be of Holocene age. Krummel volcano at the S end of the group contains a summit crater, breached to the NW. The highest peak of the Garbuna group is 1,110-m-high Welcker volcano, which has fed blocky lava flows that extend to the eastern coast of the peninsula. Sources: Rabaul Volcano Observatory, Darwin Volcanic Ash Advisory Center http://www.bom.gov.au/info/vaac/advisories.shtml, The National http://www.thenational.com.pg/1018/nation2.htm Garbuna Group Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0502-07= Ongoing Activity CLEVELAND Aleutian Islands, USA 52.82�N, 169.95�W; summit elev. 1,730 m After a brief ash burst at Cleveland on 7 October, no further eruptive activity was recorded at the volcano. On 10 October, AVO reduced the Concern Color Code from Orange to Yellow . AVO warned that although there were no additional ash bursts noted, they consider the volcano restless. Explosive ash-producing events could occur at any time and without warning (owing to the lack of local seismic monitoring). AVO continued to monitor the volcano using satellite imagery. Background. The symmetrical Mount Cleveland stratovolcano is situated at the western end of the uninhabited dumbbell-shaped Chuginadak Island in the east- central Aleutians. The 1,730-m-high stratovolcano is the highest of the Islands of Four Mountains group and is one of the most active in the Aleutians. Numerous large lava flows descend its flanks. It is possible that some 18th to 19th century eruptions attributed to Carlisle (a volcano located across the Carlisle Pass Strait to the NW) should be ascribed to Cleveland. In 1944 Cleveland produced the only known fatality from an Aleutian eruption. Recent eruptions from Mt. Cleveland have been characterized by short-lived explosive ash emissions, at times accompanied by lava fountaining and lava flows down the flanks. Source: Alaska Volcano Observatory http://www.avo.alaska.edu/activity/avoreport.php?view=update Cleveland Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1101-24- DUKONO Halmahera, Indonesia 1.70�N, 127.87�E; summit elev. 1,185 m Explosions and pyroclastic ejections continued at Dukono during 10-16 October. Ash columns rose 100-950 m above the summit (or 4,200-7,000 ft a.s.l.) and mainly drifted SE. Seismicity was dominated by explosion earthquakes. Dukono remained at Alert Level 2. Background. Reports from this remote volcano in northernmost Halmahera are rare, but Dukono has been one of Indonesia's most active volcanoes. More-or- less continuous explosive eruptions, sometimes accompanied by lava flows, occurred since 1933 until at least the mid-1990s, when routine observations were curtailed. During a major eruption in 1550, a lava flow filled in the strait between Halmahera and the N-flank cone of Gunung Mamuya. Dukono is a complex volcano presenting a broad, low profile with multiple summit peaks and overlapping craters. Malupang Wariang, 1 km SW of Dukono's summit crater complex, contains a 700 x 570 m crater that has also been active during historical time. Source: Directorate of Volcanology and Geological Hazard Mitigation http://www.vsi.esdm.go.id/portal/html/index.php Dukono Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0608-01= EREBUS Ross Island, Antarctica 77.53�S, 167.17�E; summit elev. 3,794 m According to the Mt. Erebus activity log, several "small- to medium-sized" eruptions occurred during 12-18 October, with a "very large" eruption occurring on 14 October. The eruption sizes were based on comparisons of seismic data for known Erebus eruptions. Background. Mount Erebus, the world's southernmost historically active volcano, overlooks the McMurdo research station on Ross Island. The 3,794-m- high Erebus is the largest of three major volcanoes forming the crudely triangular Ross Island. The summit of Mount Erebus has been modified by several generations of caldera formation. A summit plateau at about 3,200 m altitude marks the rim of the youngest caldera, within which the modern cone was constructed. An elliptical 500 x 600 m wide, 110-m-deep crater truncates the summit and contains an active lava lake within a 250-m-wide, 100-m-deep inner crater. The glacier-covered volcano was erupting when first sighted by Captain James Ross in 1841. Continuous lava-lake activity has been documented since 1972, punctuated by occasional Strombolian explosions that eject bombs onto the crater rim. Source: Mount Erebus Volcano Observatory http://www.ees.nmt.edu/Geop/Erebus/erebus.html Mount Erebus Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1900-02= KARANGETANG [Api Siau] Siau Island, Indonesia 2.47�N, 125.29�E; summit elev. 1,784 m Gas was emitted from Karangetang's North and Batukole craters during 10-16 October. Seismicity was dominated by multiphase events, which decreased in number in comparison to the previous week. The number of deep volcanic earthquakes increased. Karangetang remained at Alert Level 3 (on a scale of 1- 4). Background. Karangetang (also known as Api Siau) lies at the northern end of the island of Siau, N of Sulawesi. The 1,784-m-high stratovolcano contains five summit craters along a N-S line. One of Indonesia's most active volcanoes, Karangetang has had more than 40 recorded eruptions since 1675. Twentieth-century eruptions have included frequent explosions, sometimes accompanied by pyroclastic flows and lahars. Source: Directorate of Volcanology and Geological Hazard Mitigation http://www.vsi.esdm.go.id/portal/html/index.php Karangetang Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0607-02= KILAUEA Hawaii, USA 19.43�N, 155.29�W; summit elev. 1,222 m On 18 October, weak surface lava flows were visible at Kilauea and one cascade of lava flowed off of the western front of the East Lae`apuki delta. Background volcanic tremor was near normal levels at Kilauea's summit. Volcanic tremor was at moderate levels at Pu`u `O`o. During 11-18 October, small amounts of inflation and deflation occurred at the volcano. Background. Kilauea, one of five coalescing volcanoes that comprise the island of Hawaii, is one of the world's most active volcanoes. Eruptions at Kilauea originate primarily from the summit caldera or along one of the lengthy E and SW rift zones that extend from the caldera to the sea. About 90% of the surface of Kilauea is formed by lava flows less than about 1,100 years old; 70% of the volcano's surface is younger than 600 years. The latest Kilauea eruption began in January 1983 along the E rift zone. This long-term ongoing eruption from Pu`u `O`o-Kupaianaha has produced lava flows that have traveled 11-12 km from the vents to the sea, paving about 104 km2 of land on the S flank of Kilauea and building more than 200 hectares of new land. Source: US Geological Survey Hawaiian Volcano Observatory http://volcanoes.usgs.gov/update.html Kilauea information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1302-01- MICHAEL Antarctica United Kingdom 57.78�S, 26.45�W; summit elev. 990 m The first MODVOLC alerts at Mount Michael since May 2003 recently began, indicating an increased level of activity in the island's summit crater (and presumed lava lake). The alerts occurred on 3, 5, and 6 October. Background. The young constructional Mount Michael stratovolcano dominates glacier-covered Saunders Island. Symmetrical 990-m-high Mount Michael has a 700-m-wide summit crater and a remnant of a somma rim to the SE. Tephra layers visible in ice cliffs surrounding the island are evidence of recent eruptions. Ash clouds were reported from the summit crater in 1819, and an effusive eruption was inferred to have occurred from a north-flank fissure around the end of the 19th century and beginning of the 20th century. A low ice-free lava platform, Blackstone Plain, is located on the N coast, surrounding a group of former sea stacks. A cluster of parasitic cones on the SE flank, the Ashen Hills, appear to have been modified since 1820. Vapor emission is frequently reported from the summit crater. Recent AVHRR and MODIS satellite imagery has revealed evidence for lava lake activity in the summit crater of Mount Michael. Sources: Hawai'i Institute of Geophysics and Planetology (HIGP) Thermal Alerts Team http://modis.higp.hawaii.edu/ and John Smellie of the British Antarctic Survey Michael Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1900-09= MONTAGU ISLAND South Sandwich Islands 58.42�S, 26.33�W; summit elev. 1,370 m An ASTER satellite image from 23 September showed a 3.5-km-long lava flow extending from the summit of Montagu Island (Mt. Belinda) into the sea. This was the largest effusive event observed during the 4-year-old eruption. Based on MODVOLC alerts, the flow appeared to have started sometime between 10 and 14 September. A conspicuous 90-m-wide channel was visible ~1 km from the vent. The image also showed a steam plume at the location of the ocean entry, and an ash-rich plume extending NE from the volcano's summit. Background. The largest of the Sandwich Islands, Montagu consists of one or more stratovolcanoes with parasitic cones and or domes. The roughly rectangular-shaped island rises about 3,000 m from the sea floor and is roughly 10 x 12 km wide with a prominent peninsula at its SE tip. Around 90% of the island is ice-covered; glaciers extend to the sea over much of the island, forming vertical ice cliffs. Mount Belinda, rising to 1,370 m, is the high point of the island and lies at the southern end of a 6-km-wide ice- filled summit caldera. Mount Oceanite, an isolated 900-m-high peak, lies at the SE tip of the island and was the source of lava flows exposed at Mathias Point and Allen Point. There was no record of Holocene or historical eruptive activity at Montagu until MODIS satellite data, beginning in late 2001, revealed thermal anomalies consistent with lava lake activity that has been persistent since then. Apparent plumes and single anomalous pixels were observed intermittently on AVHRR images during the p riod April 1995 to February 1998, possibly indicating earlier unconfirmed and more sporadic volcanic activity. Source: Hawai'i Institute of Geophysics and Planetology (HIGP) Thermal Alerts Team http://modis.higp.hawaii.edu/ and John Smellie of the British Antarctic Survey Montagu Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1900-081 SANGAY Ecuador 2.03�S, 78.34�W; summit elev. 5,188 m; All times are local (= UTC - 5 hours) An ash plume emitted from Sangay was visible on satellite imagery on 16 October around 0645. The plume moved SSW very slowly, corresponding to a possible height of ~6.7 km (22,000 ft) a.s.l. By 0900 the plume was too thin to be visible on satellite imagery and thunderstorms developed in the area, further obscuring the ash cloud. Background. The isolated Sangay volcano, located E of the Andean crest, is the southernmost of Ecuador's volcanoes, and its most active. It has been in frequent eruption for the past several centuries. The steep-sided, 5,230-m- high glacier-covered volcano grew within horseshoe-shaped calderas of two previous edifices, which were destroyed by collapse to the E, producing large debris avalanches that reached the Amazonian lowlands. The modern edifice dates back to at least 14,000 years ago. Sangay towers above the tropical jungle on the E side; on the other sides flat plains of ash from the volcano have been sculpted by heavy rains into steep-walled canyons up to 600 m deep. The earliest report of an historical eruption was in 1628. More or less continuous eruptions were reported from 1728 until 1916, and again from 1934 to the present. The more or less constant eruptive activity has caused frequent changes to the morphology of the summit crater complex. Source: Washington Volcanic Ash Advisory Center http://www.ssd.noaa.gov/VAAC/messages.html Sangay Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1502-09= SAN MIGUEL El Salvador 13.431�N, 88.272�W; summit elev. 2,130 m SNET reported that activity had not changed at San Miguel after small clusters of earthquakes occurred at the volcano during 27 September to about 14 October. During a visit to the volcano on 13 October small rockfalls were seen, but there were no significant changes in the crater and sulfur-dioxide emissions were very weak. Background. The symmetrical cone of San Miguel volcano, one of the most active in El Salvador, rises from near sea level to form one of the country's most prominent landmarks. A broad, deep crater that has been frequently modified by historical eruptions (recorded since the early 16th century) caps the truncated summit of the towering volcano, which is also known locally as Chaparrastique. Radial fissures on the flanks of the basaltic volcano have fed a series of fresh lava flows, including several erupted during the 17th-19th centuries that reached beyond the base of the volcano on the N, W, and SE sides. The SE-flank lava flows are the largest and form broad sparsely vegetated lava fields. Source: Servicio Nacional de Estudios Territoriales (SNET) http://www.snet.gob.sv/Geologia/Vulcanologia/evento022005.htm San Miguel Reports from the monthly Bulletin of the Global Volcanism Network http://www.volcano.si.edu/gvp/world/region14/elsalv/sanmigue/var.htm SANTA ANA El Salvador 13.853�N, 89.630�W; summit elev. 2,365 m During 12-17 October, seismicity was relatively stable and there were low- level gas emissions at Santa Ana. Storms on 12 October caused the generation of lahars that traveled towards Coatepeque. Background. Santa Ana, El Salvador's highest volcano, is a massive stratovolcano immediately W of Coatepeque caldera. Collapse of the volcano during the late Pleistocene or early Holocene produced a massive debris avalanche that swept into the Pacific, forming the Acajutla Peninsula. Reconstruction of the volcano rapidly filled the collapse scarp. The broad summit of the volcano is cut by several crescentic craters, and a series of parasitic vents and cones have formed along a 20-km-long fissure system that extends from near the town of Chalchuapa NNW of the volcano to the San Marcelino and Cerro Chino cinder cones on the SE flank. Historical activity, largely consisting of small-to-moderate explosive eruptions from both summit and flank vents, has been documented since the 16th century. The San Marcelino cinder cone on the SE flank produced a lava flow in 1722 that traveled 11 km to the E. Source: Servicio Nacional de Estudios Territoriales http://www.snet.gob.sv/ Santa Ana Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1403-02= SOUFRI�RE HILLS Montserrat, West Indies 16.72�N, 62.18�W; summit elev. 1,052 m Volcanic and seismic activity at Soufri�re Hills remained at elevated levels during 7-14 October. Lava-dome growth mostly occurred on the W side of the dome, which was largely obscured by clouds and steam. Observations suggested that the lava-dome growth rate increased, with preliminary calculations suggesting a rate of at least 2 cubic meters per second. Incandescence was visible at the lava dome on a video camera at night. The sulfur-dioxide flux averaged 580 metric tons per day (t/d), above the long-term eruption average of 500 t/d. The hydrogen-chloride versus sulfur-dioxide ratio increased to about 1. Background. The complex dominantly andesitic Soufri�re Hills volcano occupies the southern half of the island of Montserrat. The summit area consists primarily of a series of lava domes emplaced along an ESE-trending zone. English's Crater, a 1-km-wide crater breached widely to the east, was formed during an eruption about 4000 years ago in which the summit collapsed, producing a large submarine debris avalanche. Block-and-ash flow and surge deposits associated with dome growth predominate in flank deposits at Soufri�re Hills. Non-eruptive seismic swarms occurred at 30-year intervals in the 20th century, but with the exception of a 17th-century eruption that produced the Castle Peak lava dome, no historical eruptions were recorded on Montserrat until 1995. Long-term small-to-moderate ash eruptions beginning in that year were later accompanied by lava-dome growth and pyroclastic flows that forced evacuation of the southern half of the island and ultimately destroyed the capital city of Plymouth, causing ajor social and economic disruption. Source: Montserrat Volcano Observatory http://www.mvo.ms/ Soufri�re Hills Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1600-05= ST. HELENS Washington, USA 46.20�N, 122.18�W; summit elev. 2,549 m Growth of the new lava dome inside the crater of Mount St. Helens continued during 12-18 October, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. There were no significant changes in seismicity or deformation during the report period. During the previous few weeks, a prominent linear feature developed on the disintegrating "whaleback" that grew during the previous spring and summer and was currently located E of the actively growing part of the new lava dome. A digital elevation model of the active lava dome, which was created from aerial photographs taken on 10 August, showed that the volume had grown to 62 million cubic meters. The average rate of growth during late July and early August was about 2 cubic meters per second, a rate that typified most of 2005. St Helens remained at Volcano Advisory (Alert Level 2); aviation color code Orange. Background. Prior to 1980, Mount St. Helens formed a conical, youthful volcano sometimes known as the Fuji-san of America. During the 1980 eruption the upper 400 m of the summit was removed by slope failure, leaving a 2 x 3.5 km horseshoe-shaped crater now partially filled by a lava dome. Mount St. Helens was formed during nine eruptive periods beginning about 40-50,000 years ago, and has been the most active volcano in the Cascade Range during the Holocene. The modern edifice was constructed during the last 2,200 years, when the volcano produced basaltic as well as andesitic and dacitic products from summit and flank vents. Historical eruptions in the 19th century originated from the Goat Rocks area on the N flank, and were witnessed by early settlers. Source: USGS Cascades Volcano Observatory http://vulcan.wr.usgs.gov/Volcanoes/MSH/CurrentActivity/framework.html St. Helens Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1201-05- STROMBOLI Aeolian Islands, Italy 38.79�N, 15.21�E; summit elev. 926 m A plume emitted from Stromboli that may have contained ash was visible on satellite imagery on 14 October at a height around 1.8-2.4 km (6,000-8,000 ft) a.s.l. The plume extended ~10 km NW of the volcano. Background. Spectacular incandescent nighttime explosions at Stromboli volcano have long attracted visitors to the "Lighthouse of the Mediterranean." Stromboli, the NE-most of the Aeolian Islands, has lent its name to the frequent mild explosive activity that has characterized its eruptions throughout historical time. The small, 926-m-high island of Stromboli is the emergent summit of a volcano that grew in two main eruptive cycles, the last of which formed the western portion of the island. The active summit vents are located at the head of the Sciara del Fuoco, a horseshoe-shaped scarp formed as a result of slope failure that extends to below sea level and funnels pyroclastic ejecta and lava flows to the NW. Essentially continuous mild Strombolian explosions, sometimes accompanied by lava flows, have been recorded at Stromboli since Roman times. Source: Toulouse Volcanic Ash Advisory Center http://www.ssd.noaa.gov/VAAC/OTH/FR/messages.html Stromboli Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0101-04= TANAGA Aleutian Islands, USA 51.885�N, 178.146�W; summit elev.1806 m Elevated seismic activity below young volcanic vents on Tanaga Island continued during 7-14 October, although the rate of small earthquakes reduced slightly in comparison to the previous week. The activity that began at Tanaga on 1 October was at the highest level recorded since the seismic network was installed in 2003, so the Concern Color Code remained at Yellow . Background. Tanaga volcano, the second largest volcanic center of the central Aleutians, is the central and highest of three youthful stratovolcanoes oriented along a roughly E-W line at the NW tip of Tanaga Island. Arcuate ridges to the east and south may represent the rim of an older caldera that cuts an older shield-like volcano. Most Holocene eruptions originated from Tanaga volcano itself, which consists of two large cones, the western of which is the highest, constructed within a caldera whose 400-m-high rim is prominent to the SE. At the westernmost end of the Tanaga complex is conical Sakaja, a 1304-m-high double cone that may be the youngest of the three volcanoes. A thick blanket of fine ash that may have accumulated over the past several thousand years covers much of Tanaga Island. Source: Alaska Volcano Observatory http://www.avo.alaska.edu/activity/avoreport.php?view=update Tanaga Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1101-08- ********************************************************* Gari Mayberry US Geological Survey/Global Volcanism Program Smithsonian Institution National Museum of Natural History MRC-119 Dept. of Mineral Sciences Washington, DC 20560-0119 http://www.volcano.si.edu/reports/usgs/ **********************************************************

**************************************** GVP/USGS Weekly Volcanic Activity Report 23-29 November 2005 ***************************************** New Activity: | Augustine, USA | Galeras, Colombia | Karthala, Comoros Islands | Piton de la Fournaise, Reunion Island Ongoing Activity: | Cleveland, USA | Colima, Mexico | Garbuna Group, Papua New Guinea | Kilauea, USA | Langila, Papua New Guinea | Rabaul, Papua New Guinea | Santa Ana, El Salvador | Soufri�re Hills, Montserrat | St. Helens, USA | Tanaga, USA | Tungurahua, Ecuador | Ulawun, Papua New Guinea New Activity/Unrest AUGUSTINE SW Alaska, USA 59.363�N, 153.43�W; summit elev. 1,252 m On 29 November AVO raised the Concern Color Code at Augustine from Green to Yellow after recording long-term important changes in seismicity and ground deformation consistent with renewed volcanic unrest . There were no indications that an eruption was imminent or certain. Beginning in May 2005, there was a slow increase in the number of earthquakes under Augustine. The earthquakes were generally small (less than M 1) and concentrated roughly 1 km below the volcano's summit. These earthquakes slowly increased from 4-8 earthquakes per day to 20-35 earthquakes per day. Additionally, data from a Global Positioning System (GPS) network on Augustine indicated that a slow, steady inflation of the volcano started in mid-summer 2005, continuing until the present. The GPS benchmark located nearest the summit moved a total of 2.5 cm. This motion is consistent with a source of inflation or pressure change centered under the volcano. This is the first such deformation detected at Augustine since measurements began just prior to the 1986 eruption. No reports of increased steaming were received by AVO, nor have satellite data shown increased thermal activity. Background. Augustine volcano, rising above Kamishak Bay in the southern Cook Inlet about 290 km SW of Anchorage, is the most active volcano of the eastern Aleutian arc. It consists of a complex of overlapping summit lava domes surrounded by an apron of volcaniclastic debris that descends to the sea on all sides. Few lava flows are exposed; the flanks consist mainly of debris- avalanche and pyroclastic-flow deposits formed by repeated collapse and regrowth of the volcano's summit. The latest episode of edifice collapse occurred during Augustine's largest historical eruption in 1883; subsequent dome growth has restored the volcano to a height comparable to that prior to 1883. The oldest dated volcanic rocks on Augustine are more than 40,000 years old. At least 11 large debris avalanches have reached the sea during the past 1800-2000 years, and five major pumiceous tephras have been erupted during this interval. Historical eruptions have typically consisted of explosive activity with emplacement of pumiceous yroclastic-flow deposits followed by lava dome extrusion with associated block-and-ash flows. Source: Alaska Volcano Observatory http://www.avo.alaska.edu/activity/avoreport.php?view=update Augustine Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1103-01- GALERAS Colombia 1.22�N, 77.37�W; summit elev. 4,276 m; All times are local (= UTC - 5 hours) On 24 November at 0246 seismicity was recorded at Galeras that was associated with the beginning of an eruption. Ash from the eruption fell in the towns of Fontibon, San Cayetano, Postobon, and in north Pasto (E of the volcano). INGEOMINAS raised the Alert Level from 2 (probable eruption in days to weeks) to 1 (eruption imminent or occurring). The Washington VAAC observed a small puff of ash NE of the volcano at a height around ~4.6 km (15,000 ft) a.s.l. Activity decreased by the next day, so the Alert Level was reduced to 2. Thousands of people had been evacuated from the vicinity of the volcano during the week prior to the eruption. Background. Galeras, a stratovolcano with a large breached caldera located immediately W of the city of Pasto, is one of Colombia's most frequently active volcanoes. The dominantly andesitic Galeras volcanic complex has been active for more than 1 million years, and two major caldera collapse eruptions took place during the late Pleistocene. Long-term extensive hydrothermal alteration has affected the volcano. This has contributed to large-scale edifice collapse that has occurred on at least three occasions, producing debris avalanches that swept to the W and left a large horseshoe-shaped caldera inside which the modern cone has been constructed. Major explosive eruptions since the mid Holocene have produced widespread tephra deposits and pyroclastic flows that swept all but the southern flanks. A central cone slightly lower than the caldera rim has been the site of numerous small-to-moderate historical eruptions since the time of the Spanish conquistadors. Sources: Instituto Colombiano de Geolog�a y Miner�a (INGEOMINAS) http://www.ingeominas.gov.co/tmsingeominas/ModuloPublicacionPortal/PublicacionP ortal.asp, Associated Press http://news.yahoo.com/s/ap/20051126/ap_on_re_la_am_ca/colombia_volcano_5, Reuters http://www.cnn.com/2005/TECH/science/11/24/colombia.volcano.reut/index.html? section=cnn_latest Galeras Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1501-08= KARTHALA Comoros Islands, Indian Ocean 11.75�N, 43.38�E; summit elev. 2,361 m According to news reports, a phreatomagmatic eruption occurred at Karthala during the evening of 24 November. Ash fell in several towns, including in the capital city Morini along the Grand Comore island's SW coast and on the volcano's W flank. According to a UN OCHA report, local authorities estimated that about 2,000 people temporarily fled their villages in the region of Bamboa in the central part of Grand Comore Island, and sought refuge in less exposed areas, such as Mitsamiouli, Mboud�, and Oichili. During the evacuation, an infant died due to respiratory distress. Ashfall caused the closure of shops and schools in Moroni and security forces cleaned the streets using water tankers. Residents were warned to avoid inhaling ash. Preliminary assessments revealed that about 118,000 people living in 75 villages may have been affected by the contamination of domestic water tanks. This is of particular concern because it is the height of the dry season. A UN worker reported that 245,000 people live in the are exposed to ash and estimated that 175,000 could face water shortages. There were also concerns about the impact of ash on agriculture and livestock. The Toulouse VAAC reported that ash from the early phase of the eruption was not immediately seen on satellite imagery, but that ash fell at the local airport. AFWA reported that the ash cloud was visible on satellite imagery on 25 November at a height of ~11.6 km (~38,000 ft) a.s.l. According to the Karthala Volcano Observatory, a lava lake formed in the volcano's crater. As of 29 November, seismic activity continued at the volcano. Background. The southernmost and largest of the two shield volcanoes forming Grand Comore Island (also known as Ngazidja), Karthala contains a 3 x 4 km summit caldera generated by repeated collapse. Elongated rift zones extend to the NNW and SE from the summit of the Hawaiian-style shield, which has an asymmetrical profile that is steeper to the S. Historical eruptions have modified the morphology of the compound, irregular summit caldera. More than twenty eruptions have been recorded since the 19th century from both summit and flank vents. Many lava flows have reached the sea on both sides of the island, including during many 19th-century eruptions from the summit caldera and vents on the northern and southern flanks. Sources: Toulouse VAAC http://www.ssd.noaa.gov/VAAC/OTH/FR/messages.html, United Nations Office for the Coordination of Humanitarian Affairs (UN OCHA) http://www.reliefweb.int/rw/RWB.NSF/db900SID/EGUA-6JKM4V?OpenDocument, Integrated Regional Information Network http://www.irinnews.org/report.asp? ReportID=50399&SelectRegion=Southern_Africa&SelectCountry=COMOROS, Air Force Weather Agency, Agence France Presse http://www.allheadlinenews.com/articles/7001187689, News 24 http://www.news24.com/News24/Africa/News/0,,2-11-1447_1842069,00.html, Angola Press http://www.angolapress-angop.ao/noticia-e.asp?ID=394675 Karthala Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0303-01= PITON DE LA FOURNAISE R�union Island, Indian Ocean 21.23�S, 55.71�E; summit elev. 2,631 m; All times are local (= UTC + 4 hours) OVPDLF reported that immediately after the end of the last eruption at the Dolomieu crater of Piton de la Fournaise that began on 5 October 2005, the permanent GPS network and extensometer network at the volcano continued to show strong surface deformation, which was a precursor for a new eruptive event. On 29 November at 0559 a seismic crisis began at the volcano and at 0625 tremor indicated the beginning of an eruption. A vent opened in the western part of Dolomieu crater and another vent opened on the volcano's N flank. Very little projected volcanic material was visible. A rapid and large lava flow traveled down the N flank in the direction of Piton Kapor. Inclement weather prohibited further observations. The Toulouse VAAC reported that ash from the eruption was not visible on satellite imagery. Background. The massive Piton de la Fournaise shield volcano on the island of R�union is one of the world's most active volcanoes. Most historical eruptions have originated from the summit and flanks of Dolomieu, a 400-m-high lava shield that has grown within the youngest of three large calderas. This latter caldera is 8 km wide and is breached to below sea level on the eastern side. More than 150 eruptions, most of which have produced fluid basaltic lava flows within the caldera, have been documented since the 17th century. Sources: Observatoire Volcanologique du Piton de la Fournaise http://volcano.ipgp.jussieu.fr:8080/reunion/stationreu2.html, Toulouse VAAC http://www.ssd.noaa.gov/VAAC/OTH/FR/messages.html Piton de la Fournaise Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0303-02= Ongoing Activity CLEVELAND Aleutian Islands, USA 52.82�N, 169.95�W; summit elev. 1,730 m Activity at Cleveland further decreased during 18-25 November. Following a brief ash burst on 7 October, no further ash emissions were noted. AVO did not detect a temperature anomaly in the vicinity of the volcano after 6 November. Based on this information, AVO concluded that the likelihood of significant ash- producing events decreased, so they terminated Concern Color Code Yellow . Cleveland is not monitored with seismic equipment, therefore AVO did not assign Color Concern Code Green. Background. The symmetrical Mount Cleveland stratovolcano is situated at the western end of the uninhabited dumbbell-shaped Chuginadak Island in the east-central Aleutians. The 1,730-m-high stratovolcano is the highest of the Islands of Four Mountains group and is one of the most active in the Aleutians. Numerous large lava flows descend its flanks. It is possible that some 18th to 19th century eruptions attributed to Carlisle (a volcano located across the Carlisle Pass Strait to the NW) should be ascribed to Cleveland. In 1944 Cleveland produced the only known fatality from an Aleutian eruption. Recent eruptions from Mt. Cleveland have been characterized by short-lived explosive ash emissions, at times accompanied by lava fountaining and lava flows down the flanks. Source: Alaska Volcano Observatory http://www.avo.alaska.edu/activity/avoreport.php?view=update Cleveland Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1101-24- COLIMA Western M�xico 19.514�N, 103.62�W; summit elev. ~3,850 m Several small explosions occurred at Colima during 23-28 November, producing plumes that reached a maximum height of ~8.5 km (28,000 ft) a.s.l. on 24 November. Background. The Colima volcanic complex is the most prominent volcanic center of the western Mexican Volcanic Belt. It consists of two southward-younging volcanoes, Nevado de Colima (the 4,320 m high point of the complex) on the N and the historically active Volc�n de Colima on the S. Volc�n de Colima (also known as Volc�n Fuego) is a youthful stratovolcano constructed within a 5-km-wide caldera, breached to the S, that has been the source of large debris avalanches. Major slope failures have occurred repeatedly from both the Nevado and Colima cones, and have produced a thick apron of debris-avalanche deposits on three sides of the complex. Frequent historical eruptions date back to the 16th century. Occasional major explosive eruptions (most recently in 1913) have destroyed the summit and left a deep, steep-sided crater that was slowly refilled and then overtopped by lava dome growth. Sources: Universidad de Colima http://www.ucol.mx/volcan/, Washington Volcanic Ash Advisory Center http://www.ssd.noaa.gov/VAAC/messages.html Colima Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1401-04= GARBUNA GROUP New Britain Island, Papua New Guinea 5.45�S, 150.03�E; summit elev. 564 m During 21-27 November, two vents at the summit of Garbuna continued to release weak-to-moderate volumes of steam that rose a few hundred meters above the summit and drifted in various directions. No incandescence was seen at the volcano and no noises were heard. Seismicity was at very low levels. Background. The basaltic-to-dacitic Garbuna volcano group consists of three volcanic peaks, Krummel, Garbuna, and Welcker. They are located along a 7-km N- S line above a shield-like foundation at the southern end of the Willaumez Peninsula. The central and lower peaks of the centrally located 654-m-high Garbuna volcano contain a large vegetation-free area that is probably the most extensive thermal field in Papua New Guinea. A prominent lava dome and blocky lava flow in the center of the thermal area have resisted destruction by thermal activity, and may be of Holocene age. Krummel volcano at the S end of the group contains a summit crater, breached to the NW. The highest peak of the Garbuna group is 1,005-m-high Welcker volcano, which has fed blocky lava flows that extend to the eastern coast of the peninsula. Source: Rabaul Volcano Observatory via the Darwin Volcanic Ash Advisory Center http://www.bom.gov.au/info/vaac/advisories.shtml Garbuna Group Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0502-07= KILAUEA Hawaii, USA 19.43�N, 155.29�W; summit elev. 1,222 m During 23-29 November, lava from Kilauea continued to enter the sea at the East Lae`apuki area and surface lava flows were visible on the Pulama pali fault scarp. Background volcanic tremor was near normal levels at Kilauea's summit. Volcanic tremor reached moderate levels at Pu`u `O`o. Small amounts of deformation occurred at the volcano. Background. Kilauea, one of five coalescing volcanoes that comprise the island of Hawaii, is one of the world's most active volcanoes. Eruptions at Kilauea originate primarily from the summit caldera or along one of the lengthy E and SW rift zones that extend from the caldera to the sea. About 90% of the surface of Kilauea is formed by lava flows less than about 1,100 years old; 70% of the volcano's surface is younger than 600 years. The latest Kilauea eruption began in January 1983 along the E rift zone. This long-term ongoing eruption from Pu`u `O`o-Kupaianaha has produced lava flows that have traveled 11-12 km from the vents to the sea, paving about 104 km2 of land on the S flank of Kilauea and building more than 200 hectares of new land. Source: US Geological Survey Hawaiian Volcano Observatory http://volcanoes.usgs.gov/update.html Kilauea information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1302-01- LANGILA New Britain Island, Papua New Guinea 5.53�S, 148.42�E; summit elev. 1,330 m Vulcanian eruptions continued at Langila's Crater 2 during 21-27 November, with a slight increase in the level of activity compared to the previous week. The activity increase was marked by ash emissions that rose to heights between 1 and 2 km above the summit crater (or 7,650 and 10,900 ft a.s.l.). The ash clouds drifted W, SW, SE, and NW, depositing ash in those areas. Incandescence and projections of volcanic material were visible at the volcano during many nights. Crater 3 was quiet during the report period. Seismicity was at low-to-moderate levels, consisting of low-frequency earthquakes associated with the Vulcanian activity and periodic volcanic tremor. Background. Langila, one of the most active volcanoes of New Britain, consists of a group of four small overlapping composite cones on the lower eastern flank of the extinct Talawe volcano. Talawe is the highest volcano in the Cape Gloucester area of NW New Britain. A rectangular, 2.5-km-long crater is breached widely to the SE; Langila volcano was constructed NE of the breached crater of Talawe. An extensive lava field reaches the coast on the N and NE sides of Langila. Frequent mild-to-moderate explosive eruptions, sometimes accompanied by lava flows, have been recorded since the 19th century from three active craters at the summit of Langila. The youngest and smallest crater (no. 3 crater) was formed in 1960 and has a diameter of 150 m. Source: Rabaul Volcano Observatory via the Darwin Volcanic Ash Advisory Center http://www.bom.gov.au/info/vaac/advisories.shtml Langila Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0502-01= RABAUL New Britain Island, Papua New Guinea 4.271�S, 152.203�E; summit elev. 688 m Rabaul caldera's active Tavurvur cone was quiet after ash emissions ceased on 20 November. During 21-27 November, only very small traces of gas were released from the eruption vent and from other spots on the summit area. Seismicity was at very low levels and a small amount of ground inflation was recorded. Background. The low-lying Rabaul caldera on the tip of the Gazelle Peninsula at the NE end of New Britain forms a broad sheltered harbor. The outer flanks of the 688-m-high asymmetrical pyroclastic shield volcano are formed by thick pyroclastic-flow deposits. The 8 x 14 km caldera is widely breached on the E, where its floor is flooded by Blanche Bay. Two major Holocene caldera-forming eruptions at Rabaul took place as recently as 3,500 and 1,400 years ago. Three small stratovolcanoes lie outside the northern and NE caldera rims. Post-caldera eruptions built basaltic-to-dacitic pyroclastic cones on the caldera floor near the NE and western caldera walls. Several of these, including Vulcan cone, which was formed during a large eruption in 1878, have produced major explosive activity during historical time. A powerful explosive eruption in 1994 occurred simultaneously from Vulcan and Tavurvur volcanoes and forced the temporary abandonment of Rabaul city. Source: Rabaul Volcano Observatory via the Darwin Volcanic Ash Advisory Center http://www.bom.gov.au/info/vaac/advisories.shtml Rabaul Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0502-14= SANTA ANA El Salvador 13.853�N, 89.630�W; summit elev. 2,365 m During 23-28 November, seismicity at Santa Ana was above background levels. Small earthquakes occurred that were interpreted as being associated with gas pulses. The amount of gas emitted was low. The Alert Level remained at Red, the highest level, within a 5-km radius around the volcano's central crater. Background. Santa Ana, El Salvador's highest volcano, is a massive stratovolcano immediately W of Coatepeque caldera. Collapse of the volcano during the late Pleistocene or early Holocene produced a massive debris avalanche that swept into the Pacific, forming the Acajutla Peninsula. Reconstruction of the volcano rapidly filled the collapse scarp. The broad summit of the volcano is cut by several crescentic craters, and a series of parasitic vents and cones have formed along a 20-km-long fissure system that extends from near the town of Chalchuapa NNW of the volcano to the San Marcelino and Cerro Chino cinder cones on the SE flank. Historical activity, largely consisting of small-to-moderate explosive eruptions from both summit and flank vents, has been documented since the 16th century. The San Marcelino cinder cone on the SE flank produced a lava flow in 1722 that traveled 11 km to the E. Source: Servicio Nacional de Estudios Territoriales http://www.snet.gob.sv/ Santa Ana Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1403-02= SOUFRI�RE HILLS Montserrat, West Indies 16.72�N, 62.18�W; summit elev. 1,052 m Activity at Soufri�re Hills increased during 18-25 November in comparison to the previous week. Growth of the volcano's lava dome was focused towards the E and S, with minor activity to the S and W. Continuous incandescence was observed at night on the SE and E sides of the lava dome. A pyroclastic flow was seen in the upper reaches of the Tar River Valley on 22 November. Minor ash emissions occurred from the volcano, including one on the afternoon of 24 November that sent an ash cloud several hundred meters above the volcano's summit. Measurements of sulfur-dioxide emissions were only possible on 2 days due to the wind direction. An average of 1,055 metric tons of sulfur dioxide was measured daily. Background. The complex dominantly andesitic Soufri�re Hills volcano occupies the southern half of the island of Montserrat. The summit area consists primarily of a series of lava domes emplaced along an ESE-trending zone. English's Crater, a 1-km-wide crater breached widely to the east, was formed during an eruption about 4000 years ago in which the summit collapsed, producing a large submarine debris avalanche. Block-and-ash flow and surge deposits associated with dome growth predominate in flank deposits at Soufri�re Hills. Non-eruptive seismic swarms occurred at 30-year intervals in the 20th century, but with the exception of a 17th-century eruption that produced the Castle Peak lava dome, no historical eruptions were recorded on Montserrat until 1995. Long-term small-to-moderate ash eruptions beginning in that year were later accompanied by lava-dome growth and pyroclastic flows that forced evacuation of the southern half of the island and ultimately destroyed the capital city of Plymouth, causing ma or social and economic disruption. Source: Montserrat Volcano Observatory http://www.mvo.ms/ Soufri�re Hills Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1600-05= ST. HELENS Washington, USA 46.20�N, 122.18�W; summit elev. 2,549 m Growth of the new lava dome inside the crater of Mount St. Helens continued during 23-28 November, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. There were no significant changes in seismicity or deformation during the report period. St Helens remained at Volcano Advisory (Alert Level 2); aviation color code Orange. Background. Prior to 1980, Mount St. Helens formed a conical, youthful volcano sometimes known as the Fuji-san of America. During the 1980 eruption the upper 400 m of the summit was removed by slope failure, leaving a 2 x 3.5 km horseshoe-shaped crater now partially filled by a lava dome. Mount St. Helens was formed during nine eruptive periods beginning about 40-50,000 years ago, and has been the most active volcano in the Cascade Range during the Holocene. The modern edifice was constructed during the last 2,200 years, when the volcano produced basaltic as well as andesitic and dacitic products from summit and flank vents. Historical eruptions in the 19th century originated from the Goat Rocks area on the N flank, and were witnessed by early settlers. Source: USGS Cascades Volcano Observatory http://vulcan.wr.usgs.gov/Volcanoes/MSH/CurrentActivity/framework.html St. Helens Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1201-05- TANAGA Aleutian Islands, USA 51.885�N, 178.146�W; summit elev.1806 m AVO reported on 25 November that for several weeks seismicity beneath young volcanic vents on Tanaga Island decreased significantly from levels recorded in early October. Satellite images of the island showed no anomalous temperatures or evidence of ash emissions. AVO reported that based on the decrease in earthquake counts and frequency of tremor episodes, the likelihood of an eruption had diminished. Therefore, AVO downgraded the Concern Color Code from Yellow to Green . Background. Tanaga volcano, the second largest volcanic center of the central Aleutians, is the central and highest of three youthful stratovolcanoes oriented along a roughly E-W line at the NW tip of Tanaga Island. Arcuate ridges to the E and S may represent the rim of an older caldera that cuts an older shield-like volcano. Most Holocene eruptions originated from Tanaga volcano itself, which consists of two large cones, the western of which is the highest, constructed within a caldera whose 400-m-high rim is prominent to the SE. At the westernmost end of the Tanaga complex is conical Sakaja, a 1,304-m-high double cone that may be the youngest of the three volcanoes. A thick blanket of fine ash that may have accumulated over the past several thousand years covers much of Tanaga Island. Source: Alaska Volcano Observatory http://www.avo.alaska.edu/activity/avoreport.php?view=update Tanaga Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1101-08- TUNGURAHUA Ecuador 1.47�S, 78.44�W; summit elev. 5,023 m During 23-28 November, volcanic activity at Tungurahua remained at low levels with small emissions of steam and gas, with low ash content. Plumes rose to a maximum height of ~6.7 km (22,000 ft) a.s.l. on 23 November. Background. The steep-sided Tungurahua stratovolcano towers more than 3 km above its northern base. It sits ~140 km S of Quito, Ecuador's capital city, and is one of Ecuador's most active volcanoes. Historical eruptions have been restricted to the summit crater. They have been accompanied by strong explosions and sometimes by pyroclastic flows and lava flows that reached populated areas at the volcano's base. The last major eruption took place from 1916 to 1918, although minor activity continued until 1925. The latest eruption began in October 1999 and prompted temporary evacuation of the town of Ba�os on the N side of the volcano. Source: Instituto Geofisico-Escuela Poltecnica Nacional http://www.igepn.edu.ec/vulcanologia/tungurahua/actividad/informet.htm Tungurahua Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=1502-08= ULAWUN New Britain Island, Papua New Guinea 5.04�S, 151.34�E; summit elev. 2,334 m A thin plume emitted from Ulawun was visible extending N on satellite imagery on 23 November. Background. The symmetrical basaltic to andesitic Ulawun stratovolcano is the highest volcano of the Bismarck arc, and one of Papua New Guinea's most frequently active. Ulawun rises above the N coast of New Britain opposite Bamus volcano. The upper 1,000 m of the 2,334-m-high volcano is unvegetated. A steep-walled valley cuts the NW side of the volcano, and a flank lava-flow complex lies to the S of this valley. Historical eruptions date back to the beginning of the 18th century. Twentieth-century eruptions were mildly explosive until 1967, but after 1970 several larger eruptions produced lava flows and basaltic pyroclastic flows, greatly modifying the summit crater. Source: Darwin Volcanic Ash Advisory Center http://www.ssd.noaa.gov/VAAC/OTH/AU/messages.html Ulawun Information from the Global Volcanism Program http://www.volcano.si.edu/world/volcano.cfm?vnum=0502-12= ********************************************************* Gari Mayberry US Geological Survey/Global Volcanism Program Smithsonian Institution National Museum of Natural History MRC-119 Dept. of Mineral Sciences Washington, DC 20560-0119

***************************************** Bulletin of the Global Volcanism Network Volume 30, Number 10, October 2005 ***************************************** Sierra Negra (Ecuador) Eruption ends 30 October; some lava on NE flank, more on E caldera floor East Pacific Rise at 10 L 44'N (Pacific Ocean) November 2003 visit finds evidence of very recent eruption Arenal (Costa Rica) Frequent pyroclastic flows from crater C since August 2004 Pacaya (Guatemala) Steam clouds and tremor in 2004; incandescence and lava flows in 2005 Santa Maria (Guatemala) Partial dome collapses in 2004; explosions and ash columns in 2005 Endeavour Segment (Juan de Fuca Ridge) Intense earthquake swarm in February-March 2005 Ol Doinyo Lengai (Tanzania) Lava continues to spill over crater rim through much of 2005 Editors: Rick Wunderman, Catherine Galley, Edward Venzke, and Gari Mayberry Volunteer Staff: Robert Andrews, Jacquelyn Gluck, Jerome Hudis, William Henoch, and Stephen Bentley Sierra Negra Gallapagos Islands, Ecuador 0.83 L S, 91.17 L W; summit elev. 1,490 m All time are local (= UTC - 6 hours) Our last report (BGVN 30:09) described the first five days of this eruption, and was taken largely from a valuable joint report of Ecuadorbreport information from several sources on these topics: (a) initial observations of the eruption, (b) caldera-floor deformation prior to the eruption, (c) observations of the eruptionbOctober (when it ended), and (d) satellite infrared observations of thermal fluxes associated with the eruption. Eruptionb30:09), the eruption began around 1730 on 22 October 2005, when an explosion was heard by many residents of the volcanobSatellite images showed no activity at 1715, but revealed a large eruption at 1745 local time (2345 UTC). The eruption cloud reached an estimated altitude of at least 15 km (50,000 ft) and was moving SW. At about this time, passengers and crew on Lindblad Expeditionsbpassenger vessel M/N Polaris had an excellent view of the eruptive plume (figure 1). Lucho Verdesoto, the expedition leader, reported that the ship was then at Cerro Dragon, Santa Cruz isl nd. Sunset was at 1753. As night fell they sailed to a position ~ 18 km NE of the volcano, where they had clear views of flows descending the volcanob(figure 2). Figure 1. Early photo of the Sierra Negra plume from the cruise ship Polaris, anchored off NW Santa Cruz island around sunset on 22 October 2005. Courtesy of Lucho Verdesoto. Figure 2. Lava spews skyward from circumferential fissure vents near the N rim of Sierra Negra caldera as flows descend the upper N flank. The photos were taken on 22 October, during the first few hours of the eruption, from the Polaris. Courtesy of Lucho Verdesoto. Naturalist Carman Guzman wrote, bso we decided to move the Polaris to a much closer location. After dinner, we were only eleven miles from the eruption itself. What a thrill! The darkness of the night enhanced the beauty of the fiery reds and oranges that were seen at the top of the caldera. We spent several hours enjoying this rare and fantastic event. Rivers of lava were running down the slopes of the volcano and enormous flames were lighting up the sky.b According to NASA MODIS imagery and VAAC/NOAA reports, on 25 October 2005 a large plume of gases and steam was observed in GOES 12 imagery for 1545 local time (2145 UTC). The plume extended ~ 460 km W and SW of the summit at an altitude of ~ 4.6 km. Figure 3 shows the average concentration of SO2 over the Sierra Negra plume as imaged by NASAbAura satellite for the period 23 October-1 November. Figure 3. The average concentration of sulfur dioxide (SO2) over Sierra Negra from 23 October-1 November measured by the Ozone Monitoring Instrument (OMI) on NASAbfrom the ground, OMI stopped seeing measurable sulfur dioxide coming from the volcano on 31 October. The column abundances of SO2 appear on the associated key (in Dobson Units, DU, a product of concentration and pathlength that reflects the number of SO2 molecules in a unit area of the atmospheric column). Courtesy of NASA Earth Observatory/Natural Hazards website. Deformation monitoring. In the early stages of this eruption, Bill Chadwick (NOAA) submitted a report on pre-eruption deformation (figure 4). The plot shows both Synthetic Aperture Radar (InSAR) and GPS data on vertical deformation of the caldera floor. Chadwick wrote that he, Dennis Geist (University of Idaho), and Dan Johnson (University of Puget Sound, recently deceased) installed a 27 station GPS network at Sierra Negra in 2000, that was reoccupied in 2001 and 2002 (Geist and others, in press). With help from UNAVCO (a consortium supporting high-precision deformation measurements), the group then added a 6-station, continuous GPS network in 2002. Since then, there occurred a change from caldera subsidence to caldera uplift in March 2003. During this uplift, an M 4.6 earthquake on 16 April 2005 marked trapdoor faulting. The continuous GPS network measured a surface displacement of 85 cm within 10 seconds. Both this event and the previous case of trapdoor faulting in 1997-8-documented by satellite measurements using Interferometric Synthetic Aperture Radar (InSAR) (Amelung and others, 2000)-were preceded by over a meter of inflation (JC3nsson and others, 2005). Both the 1997-98 and 2005 trapdoor movements occurred along the caldera floorb Figure 4. Recent history of uplift at the center of Sierra Negrabcaldera. The data plotted are only through April 2005 when the trapdoor faulting event occurred. Although not plotted, GPS data since April has continued to indicate robust deformation. Courtesy Bill Chadwick, NOAA. Aside from its immediate affects, the April 2005 earthquake left the later inflation rate unchanged. Caldera-centered uplift has continued since then without pause at about the same high rate. During the interval from March 2002 to April 2005 there was about ~ 1.2 m of uplift. Rates after the April 2005 earthquake are not plotted but were roughly the same as those during the interval March 2002-April 2005. The only other large earthquakes at Sierra Negra in the last year were an M 4.0 on 23 February 2005, which was associated with a small (2 cm) displacement near the trapdoor fault, an M 4.6 on 19 September 2005 that caused no obvious displacements, and an M 5.5, just 3 hours before the 22 October eruption started. The GPS data has not yet been processed. Field descriptions of the eruption. The eruption began on 22 October with venting along a 2-km fissure near the calderabThe fissure descended the calderabfed both northward down the outer N flank and southward onto the NE caldera floor. Although flows reached 5 km down the outer flank, flow into the caldera soon dominated, with strong channels descending inner caldera slopes before combining to form a wide a'a flow banked against the calderabdiscussion, BGVN 30:09). Figure 5 is a photo taken by Greg Estes on 24 October. It highlights the vigorous venting and intracaldera flows at that point in the eruption. Figure 6, a post-eruption satellite photo, illustrates the broad pattern of still-cooling, erupted lavas (which appear as light colored areas on this 2 November thermal-infrared image). Although this may represent the best overview of the new lavas at this time, some of the thinnest flows or chilled flow features may not appear on this image. Figure 5. The Sierra Negra eruption setting as viewed from the E caldera rim. The fissure vent was vigorously emitting fountains, and there were several anastomosing lava flows pouring into the caldera. Photo was taken at night on 24 October 2005, day 3 of the eruption. The scattered glow in the foreground was due to ponded lava covering the calderabfloor. Courtesy of Greg Estes (GalC!pagos resident and Park Guide). Figure 6. The Sierra Negra eruption setting as viewed from space in a false color ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) infrared image taken at night on 2 November, ~ 3 days after the eruption ended. N is towards the top. Caldera is 7 x 10.5 km across. Note the extra-caldera, N-flank lava flows, the lunate zone of ponded lavas along the E caldera. NASA image created by Jesse Allen, Earth Observatory, using data provided courtesy of courtesy of Eric Fielding (NASA/JPL), the NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team. By 26 October, fissure activity had narrowed to one major vent very near the N rim, but at 0830 on the 27th, eyewitness Godfrey Merlin reported that a second vent opened downslope and SE of the first. This new vent did not diminish the activity of the first, meaning that the total flux of erupting lava nearly doubled. by about 1400 on the 27th, a team including Dennis Geist (University of Idaho), Terry Naumann (University of Alaska), and Karen Harpp (Colgate University) had arrived at the E caldera rim and began sending back a series of valuable reports. Their first report noted a major vent immediately below GPS station SN12 on the rim NE of the caldera's center. This vent emitted a large intracaldera a'a flow. Some active N-flank vents stood about 300-400 m NW of a station (GV01) on the calderab50 m high. Most lava being erupted was flowing into the caldera, although some of the scoria from the fountains was falling outside the caldera and then forming a short, sluggish flow. Lava inside the caldera was cascading from the vents down the slope on the N edge of the caldera in 3 main channels, each 30-40 m across, with lava flowing at ~10 m/s (36 km/h) and in some cases over 10 m/s, and coalescing into a major a'a flow to the S. On the caldera floor these channels merged into one big a'a channel about 100 m wide that flowed more slowly both to the S, clockwise along the base of the E caldera wall, and into the moat along the S edge of the caldera floor. Pahoehoe outbreaks occurred along the margins of the major a'a flow. New a'a lava covered an estimated one-third of the caldera floor. The report for 28 October noted that the eruption was still going strong. There were no significant new events on this day, but it appeared that the lava flux had increased because the vents looked wider wider and there seemed to be a lot more gas emitted. The lava continued to feed from the vents to the caldera floor in two large streams, each ~ 20 m across with lava traveling at 5-10 m/s, adding up to probably hundreds of millions of cubic meters of lava per day. The a'a field continued to grow. The group reached the caldera floor and were able to sample both lava and tephra. By 0700 on the 29th some of the vents had shut down and the two lava channels to the W (previously fed by the upper vent) stopped moving. The lower vent still emitted lava and fed one channel E of the others. The team estimated the channel to be ~ 10 m wide and moving ~5 m/s. Assuming a 2-m depth, the lava flux was 5 to 10 million cubic meters per day, about half that seen the morning of the 29th The emission rate continued to diminish throughout the 29th and by the evening it was only 10-20% of that seen on the 28th. In addition, the amount of gases emitted decreased such that the gas plume only rose ~ 1 km, whereas earlier plumes had risen to several kilometers. The lower vent was no longer fountaining continuously as it had on the 28th; instead the fountaining came in bur ts at intervals of about 1-30 seconds. A lava lake sloshed around in the lower ventblava escaped this crater along a breach in the crater rim. The upper vent (the one that shut off) was still incandescent with a lot of gas coming out, so it was possible that there was a lava lake there too. The eruption appeared to end on the 30th. Glow was observed at 0200, but had ceased by 0400. The vents still emitted gas, but not fresh lava. However, it was possible that there was still N-flank activity. There were reports of lava flows there, and while it was certain that at least some of these flows were clastogenic (composed of spatter from fire fountains that accumulated and then began to flow), it was uncertain whether there were also actively erupting flank vents. The team remained separated from this area by hot lava, thwarting reconnaissance. Initial estimates of the coverage of the caldera floor were an area of ~ 14 km2. Assuming a 3-4 m average flow thickness, this was ~ 0.05 km3 (50,000,000 m3) of lava. Ther were obviously high error bars on this estimate, but it was clearly much less than the ~ 1 km3 extruded in the 1979 eruption. MODVOLC Thermal Alerts. A large set of thermal hotspots in multispectral imagery was observed beginning late 22 October (local time and date) and continuing through 16 November 2005 (figure 7). Although MODVOLC data were missing for some days and reduced for others (presumably due to cloud cover screening the radiation from the satellite) these hot-spot pixels dramatically document the course of the eruption. Data on figure 7 appear consistent with in-situ observations, in that by the second day, lava was at least 5 km down the outer N slope and covering much of the E caldera floor. By the 8th day (30 October), the outer slope flows had cooled significantly, but flows inside the caldera had continued their clockwise advance, filling all low points to the extreme SW corner of the caldera. Ten days later (9 November), the eruption had ended and only flows from the vents to the SE cald ra floor were still emitting detectable heat. The last pixels observed, two above the original vent area on the N rim, were on 16 November. Figure 7. Selected images of MODVOLC thermal anomalies for Sierra Negra measured from satellite (MODIS) data at three days during and after the 2005 eruption. Part A presents an overview of the region (smaller scale than the other images) on 24 October. Parts B-D give a zoom-in on the 7 x 10.5 km caldera. Part B represents 24 October; Part C, 30 October; and part D, 9 November 2005. Since the eruption ended 30 October, the latter two images must thus portray the post-eruptive thermal inertial of the cooling lavas. Courtesy of Hawai`i Institute of Geophysics and Planetology, University of Hawai`i. References: Amelung, F., JC3nsson, S., Zebker, H., and Segall, P., 2000, Widespread uplift and bobserved with radar interferometry: Nature, v. 407, p. 993-996. Geist, D.J., Chadwick, W.W., Jr., and Johnson, D.J., in press, Results from new GPS monitoring networks at Fernandina and Sierra Negra volcanoes, GalC!pagos, 2000-2002: Journal of Volcanology and Geothermal Research (in press). JC3nsson, S., H. Zebker, and F. Amelung, 2005, On trapdoor faulting at Sierra Negra volcano, GalC!pagos; Journal of Volcanology and Geothermal Research, v. 144, p. 59-71. Background. The broad shield volcano of Sierra Negra at the southern end of Isabela Island contains a shallow 7 x 10.5 km caldera that is the largest in the GalC!pagos Islands. The 1,490-m-high volcano is elongated in a NNE direction. Although Sierra Negra is the largest of the five major Isabela volcanoes, it has the flattest slopes, averaging less than 5 degrees and diminishing to 2 degrees near the coast. A sinuous, N-S-trending ridge occupies the W part of the caldera floor, which lies only 100 m below its rim. VolcC!n de Azufre, the largest fumarolic area in the GalC!pagos Islands, lies within a graben between this ridge and the W caldera wall. The 1979 lava flows from Sierra Negra extend all the way to the N coast from circumferential fissure vents on the upper northern flank, an area dotted with cinder and spatter cones. Sierra Negra, along with Cerro Azul and VolcC!n Wolf, is one of the most active of Isabela Islandb Information Contacts: Lucho Verdesoto and Carman Guzman, M/N Polaris, GalC!pagos Islands, Ecuador (Email: explead.polaris@expeditions.amosconnect.com); Francisco Dousdebes, GalC!pagos Expedition Manager, Metropolitan Touring, Ecuador (Email: fdousbedes@metropolitan-touring.com); Lindblad Expeditions (URL: http://www.expeditions.com/); U.S. National Aeronautical and Space Administration (NASA), (URL: http://earthobservatory.nasa.go /; http://www.nasa.gov/vision/earth/); Bill Chadwick, Cooperative Institute for Marine Resources Studies (CIMRS), National Oceanic and Atmospheric Agency (NOAA) Pacific Marine Environmental Laboratory (PMEL), Oregon State University, 2115 SE OSU Drive, Newport, OR 97365, USA (Email: William.W.Chadwick@noaa.gov); Dennis Geist, Department of Geological Sciences, University of Idaho, Moscow, ID 83844-3022 USA (Email: dgeist@uidaho.edu); Terry Naumann, Department of Geology, University of Alaska at Anchorage, Anchorage, AK 99598, USA (Email: aftrn@uaa.alaska.edu; URL: http://geology.uaa.alaska.edu/); Karen Harpp, Department of Geology, Colgate University, 408 Lathrop Hall, Hamilton, NY 13346, USA (Email: kharpp@mail.colgate.edu; URL: http://classes.colgate.edu/kharpp/khwebpage/); MODVOLC Alerts Team, Hawaii Institute of Geophysics and Planetology (HIGP), University of Hawaii at Manoa, 1680 East-West Road, Post 602, Honolulu, HI 96822, USA (URL: http://modis.higp.hawaii.edu/). East Pacific Rise at 10 L 44bPacific Ocean 10.73 L N, ~ 105 L W In a recent publication, Rubin and van der Zander (2005) discuss radiometric methods for dating lavas as one means to establish eruption chronologies. Some of their techniques were applied to samples of fresh lava (erupted September-October 2003) found on the East Pacific Rise (EPR) at 10 L 44bkm WNW of the GalC!pagos Islands. During a November 2003 biological sampling visit to the EPR at 10 L 44bexpected to be revisiting an established hydrothermal vent field. Instead, they found indicia all of which were consistent with a recent eruption, notably fresh lava, bacterial mats, and diffuse snow- blower vents issuing from lava collapses. The team acted immediately after the cruise by sending the lava samples to the University of Hawai`i for dating. Researchers there determined that an eruption had occurred within 1 to 2 months prior to the site visit. A hydrophone array (designated N-EPR) nominally monitored this part of the EPR since 1996, but not in real time. Unfortunately, the system failed to record data during the 2002-2004 interval due to a hardware problem. Ages for lavas erupted within the past 1.5-2 years were determined with the 210Po-210Pb dating method (Rubin and others, 1994). To use this method, analyses should begin as soon as possible after samples are collected from suspected eruption locales. Radioactive disequilibrium is largest, and temporal resolution of the method is highest, immediately following eruption. According to Rubin and van der Zander (2005, p. 28) bwhen they erupt. This creates an initial 210Po (half-life = 138.4 day) deficit relative to grand parental 210Pb in freshly erupted magmas. This deficit is subsequently erased with time via radioactive ingrowth toward secular equilibrium.b References: Rubin, K.H., Macdougall, J.D., and Perfit, M.R., 1994, 210Po-210Pb dating of recent volcanic eruptions on the seafloor: Nature, v. 368, p. 841-844. Rubin, K., and van der Zander, I., 2005, Obtaining high-resolution chronologies of submarine lava eruptions: Better dating through radiochemistry: Ridge 2000 Events, v. 3 (Spring 2005), p. 28-30. Voight, J. R., Zierenberg, R.A., McClain, J., and the Science Party: Batson, P., Beers, K., Daly, M., Dushman, B., Gollner, S., Govenar, B., Haney, T.A., Hourdez, S., Liow, L.H., Parker, C., Von Damm, K., Zekley, J., and Zelnio, K.A., 2004, FIELD cruise to the northern EPR: Discoveries made during biological investigations from 8 L 37bL 48b Information Contact: Ken Rubin, Department of Geology and Geophysics, SOEST, University of Hawai`i, 1680 East West Road, Honolulu, HI 96822, USA (Email: krubin@hawaii.edu). Arenal Costa Rica 10.463 L N, 84.703 L W; summit elev. 1,657 m All times are local (= UTC - 6 hours) As described in the previous Arenal report (BGVN 29:08), on 6 July 2004 a series of pyroclastic flows descended the NE flank. These flows resulted from the collapse of the upper portions of a lava flow, and affected areas beyond those affected by pyroclastic flows during 1999-2003. Similar events have been common in recent years on the volcanobflows, and sporadic strombolian eruptions through 2004 and at least as late as November 2005. Throughout the period of this report (August 2004-September 2005) the lava flow that began to be emitted towards the NE flank in June 2004 remained active. Occasional blocks spalled off the N edge of the crater towards the NE. The NE and SE flanks continued to be affected by pyroclastic flows and acid rain. Crater D displayed fumarole activity from July 2004 through September 2005. The seismograph station VACR (2.9 km NE of the active Crater C) was out of service from 24 June 2004 until 20 August 2004. Table 1 summarizes the seismicity registered at VACR from August 2004 to September 2005. Table 1. Seismic activity registered at Arenalb2004 - September 2005. From 24 June to 20 August 2004 VACR was not operating. No data were reported for ecember 2004. Courtesy of OVSICORI-UNA. During July 2004-January 2005, pyroclastic flows were produced by the collapse of the active lava flow front. In August 2004 some eruptions generated ash columns higher than 500 m above Crater C. Through most of February 2005 Arenal was hidden by storm clouds, but late in the month it could be observed that the lava flow formerly active on the NE flank had stopped, and no other active flow was seen. The number of eruptions and the amount of ejected pyroclastic material were both reduced in February, and few eruptions produced plumes as high as 500 m. The dome in Crater C continued to grow. At the beginning of March a SW-trending lava flow was observed, and blocks were ejected to the W. During April 2005 this flow continued, and ejected blocks caused small fires in the surrounding vegetation. A new lava flow began on the SE flank, and blocks ejected to the S and SE again caused fires. In May and June 2005 the SW flow continued. In July the SW lava flow deposited blocks towards the SW, the W and the NW. The S lava flow released small avalanches off its front and sides. Occasional eruptions produced ash columns higher than 500 m above Crater C. In August 2005 the SE lava flow stopped. Few eruptions produced ash columns higher than 500 m above Crater C. During September 2005 the SW lava flow was active and deposited blocks to the SW, the W and the NW. The NE and SE flanks continued to be affected by the fall of pyroclastic material and acid rain. Observatorio VulcanolC3gico y SismolC3gico de Costa Rica -Universidad Nacional (OVSICORI-UNA) reported that around 1500 on 2 November a pyroclastic flow was observed on the SE flank of Arenal. On 3 November researchers from OVSICORI-UNA visited the affected area and, contrary to what witnesses had reported, determined that the 2 November event took place on the W flank of the volcano. The mid-size pyroclastic flow produced gas, dust, and ash that were carried by strong winds towards the SE. Despite the rainy and hazy conditions during the fieldwork it was possible to con irm the affected area and deposits. The movement of lava flows on the SW flank had been observed for the last several months. Materials descending from the summit bifurcate, covering a wide fan that ranges from the W to the SW flank. The main pyroclastic flow affected an area from the summit down to ~ 1000 m altitude. A smooth alley was carved in the steep walls of upper W flank by the transport of incandescent material. Most of the material was deposited in a distal zone 75 m wide, at the break in the steep upper cone slope. Samples were taken from hot loose blocks spalled from the lava flow; one block was still at 154 B:C, and was accompanied by several other massive blocks that were fractured by rapid cooling and rough transport. There is evidence that the fine fall material was only deposited in the upper and middle part of the edifice towards the SE. Given the sustained deposition of material in the area, visitors were advised to follow instructions and safety measures and adhere to the advice of the P rk Rangers and tour guides. Background. Conical VolcC!n Arenal is the youngest stratovolcano in Costa Rica and one of its most active. The 1,657-m-high andesitic volcano towers above the E shores of Lake Arenal, which has been enlarged by a hydroelectric project. Arenal lies along a volcanic chain that has migrated to the NW from the late-Pleistocene Los Perdidos lava domes through the Pleistocene-to-Holocene Chato volcano, which contains a 500-m-wide, lake-filled summit crater. The earliest known eruptions of Arenal took place about 7,000 years ago, and it was active concurrently with Cerro Chato until the activity of Chato ended about 3,500 years ago. Growth of Arenal has been characterized by periodic major explosive eruptions at several-hundred-year intervals and periods of lava effusion that armor the cone. Arenalbmajor explosive eruption in 1968. Continuous explosive activity accompanied by slow lava effusion and the occasional emission of pyroclastic flows has occurred since then from vents at the su mit and on the upper W flank. Information Contacts: Eliecer Duarte, Observatorio VulcanolC3gico y SismolC3gico de Costa Rica, Universidad Nacional (OVSICORI-UNA), Apartado 86-3000, Heredia, Costa Rica. (URL: http://www.ovsicori.una.ac.cr/). Pacaya Guatemala 14.381 L N, 90.601 L W; summit elev. 2,552 m All times are local (= UTC - 6 hours) Frequent steam plumes through 2002 and 2003 indicated that Pacaya was active, although incandescence from the long-term lava lake ended after June 2001. During the latter half of October 2003 constant steam and abundant emissions of water and gas were being blown to the NNW and W of the volcano (BGVN 28:10). All of the following information is derived from the reports of Instituto Nacional de Sismologia, Vulcanologia, Meteorologia e Hydrologia (INSIVUMEH). Throughout November and December 2003 and the first half of 2004, abundant clouds and columns of white and off-white gases and steam were expelled from Pacaya, generally reaching less than 400 m above the volcano and dispersing mostly to the W and SW; these were occasionally visible from Guatemala City, 30 km to the NNE. During June, July, and August 2004, near-continuous tremor and frequent long-period earthquakes were recorded at seismograph station PCG (~ 1.4 km to the W of Pacaya). On 14 June, weak incandescence was observed in the central crater of M cKenney Cone for the first time since August 2000. Pacaya continued to expel off-white smoke and/or steam which usually drifted to the S and SW and rose to 150-300 m above the volcano. On 19 July, ejection of small lava fragments began to form a cone in the bottom of the central crater of MacKenney Cone. During September-November 2004, tremor increased somewhat (from ~ 2mm in June, July, and September to 4-7 mm in December), and white steam and/or gas plumes rose 300-500 m above MacKenney Cone. Incandescence was observed throughout this time and lava clasts were expelled from the MacKenney Cone on 7-9 December. On 3 January 2005, small expulsions of incandescent lava clasts rose from the central crater, and a narrow lava flow from the S rim of the crater reached 75-100 m down the flank. Station PCG continued to register tremor, and incandescence and white plumes persisted. On 10 January, lava flowed ~ 30 m from the SW rim of the central crater of MacKenney Cone. On 12 January, two lava flows, one to the S ( ~ 125 m) and one to the SW (~ 50 m) left the central crater.

Marci were around for the Kileua eruption in '83?

OH YES!!! That is why I am Kilauea83 on a lot of places.

What was it like?

Great question. Let me collect my thoughta and write what it is like to know a volcano near you is erupting and what it is like to drive up then walk in to see it. What it looks like. What it sounds like; how it smells, tastes, feels. I have been contemplating doing this anyway. Let me work on it now. Thank you for asking.

Thanks for doing this. The feeling and visuals must have been awesome.

My vocabulary is pretty good but this will tax it to the utmost. In The Beginning...

Good start. Go on.

When you live on an active volcano with historic eruptions, you hope and expect to see it erupt. With that in mind, there are several ways to find out if it is happening. Early on, we wandered around at night looking up our dark street through the windows. Later we had radio broadcasts and television news to tell us that Kilauea was erupting. The best came later when we had scanner capabilities and had them tuned to the Hawaii Volcanoes Observatory and the National Park Service Rangers. Kilauea's current eruption began at night on January 3, 1983. The glow up the usually dark street told us either the whole world was on fire up there or we were having another eruption. That glow has since been obliterated by the use of low pressure orange-colored street lights which match and cancel out any eruption glow that might be there. As soon as it was ascertained that there WAS a new eruption occuring, Some of us ran for heavy jackets, others for water, cheese and apples, and yet another for the binoculars and cameras and flashlights. We were ready to recored the new earth forming.

Wow, this is getting exciting. I can't wait for the next episode.

Came across this site doing research for Sangay, Tungurahua, and Reventador. Some recent pictures of Tung are available here ... http://www.geocities.com/tsiktsikco/picsvolcano.html

Tsiktsik, many thanks for posting that link. Your exeriences outrank mine by quite a bit. I will ad Mauna Loa after I get finished with Kilauea. Did you know the Kraffts? I have so many questions for you I hardly know where to begin, but for starters I see you have Paracutin volcano included. It was my first volcano eruption and I'd really like to have a DVD or some form of video of the eruption (not in real life... in books.) I know the footage exists. I just can't find it for sale anywhere. Suggestions? Welcome to Geo!

marcia, kilauea started to erupt in 1983? is it still in business?

*woops* forgot to close my tag *grin*

Yes, as of this post Kilauea is erupting in a phase (last time I noted the phase it was 55) and has her own web camera http://hvo.wr.usgs.gov/cam/index.htm

0540 April 10 The main three vents, East Pond Vent, January Vent, and Drainhole, joined by South Wall Complex, are barely visible this morning owing to thick fume.

Now, as we drive the 30 or so miles to the eruption (uphill all the way) which takes about 45 minutes or so, let me tell you what we are wearing. We know we might get rained on so we each have light-weight ponchos stashed in our back packs. We wear several layers of hooded sweatshirts and wind proof jackets. The heaviest jeans are best for hiking, and mandatory is leather hiking boots covering the ankles as well as the foot. New lava is very sharp and broken. It is very easy to twist ankles and to get cuts. Flashlights with new fresh batteries are also mandatory and water bottles. Each one has his own stashed in back packs, too. Spam musubi and apples are my favorite hiking food but you can use apples and cheese and rice balls or cookies just as well. We are stuffed into the car with many layers on. In winter I would add thermal leggings to the lot under the jeans I am wearing. You need the hooded jackets to keep the lapilli from getting down your neck. New eruptions have high fountaining which pins out volcanic glass and it gets into everything. Wearing some sort of eye protection is also a good idea. Check which way the wind is going and plan to hike accordingly. Listen to the car scanner to see where they are opening the space to park near the activity. Join the rest of the car parade snaking its way up the mountain. You should be ahead of most of the people who actually sleep at night.

oh goodie, i lost the webcam, thanks for reposting!

By this time you are begining to notice that the inky blackness of the outdoors is gaining a decidedly orange hue which is brighter near the horizon. As you ascend the mountain the glow brightens until it appears to be the world's largest forest fire happening right in front of you a few miles up the road. Anticipation mounts as you pass over the National Park Boundary and head for the Hawaii Volcanoes Observatory on the rim of the summit caldera of Kilauea Volcano. You are not the first to arrive by any means but you are one who is properly attired for the duration and you notice the others are all dressed much as you are complete with hiking boots covering the ankles. You park and walk and walk toward the buildings to gain more information. Then you see it.

Around the side of the building where all the seismographs are house you note that the glow up here in an intense orange bordering on becoming yeallow. You stretch to see more but you need to be clear of the building to do that. Rather than go inside to get the update, you walk as quickly as you can to the overlook into a dark summit caldera anc across to the source of the immense roar you hear. A great lava fountain is dancing before you. Higher and Higher it goes with several smaller fountains joining it. You speak to no one in particular that this is the famous "Curtain of Fire" with which such volcano eruptions begin. A crack opens when the magma has built up enough stress and fractures the rock above it seeking release. They will eventually seal themselves off saving the main fountain to contiue the eruption. Thank you � for your encouragement. I am never sure if anyone reads what I post.

silly goose, of course we read what you post *HUGS*

I could divert my comments from the burgeoning eruption and tell you how to cut apples so they leave no trace behind while you hike, or how to wrap cheese without destroying it while in your backpack, but I think, like me, you are captivated by the scene in front of me, and want more information. People start walking up beside you, and like you they talk quietly to the inky blackness of the night broken by wildly gyrating fountains of molten rock. Your neck folds back on itself trying to see the very top. Gauging by the 45� angle straight out in front of you, it seems to cover at least 70� of your view. You wonder how high they are and how far away. In this surreal night vision nothing is as it seems. You finally wander back to the Observatory and go inside to find out anything they know about what is going on outside. (Thank you, readers, for bearing with my terrible but excited typing. I am really enjoying reliving this great adventure.)

Kia Ora I am waiting here for a report that says a debris dam plugging the outlet of Mount Ruapehu's crater lake, has finally failed. One formed after the 1995-96 eruption sequence, which emptied the lake. The lake level is now 1.2 metres or about 4ft above the hard rock rim, but the dam will most likely fail when the level is 5-7 metres (17-23ft above the rim). It WILL fail. The last time this happened in 1953, it knocked out the railway bridge at Tangiwai minutes before a fully loaded passenger train crossed - 151 people were killed. This time we know it is going to happen eventually, as there is a warning system embedded in the river upstream, and the Ministry of Civil Defence has put together a response plan for dealing with the aftermath. You will probably recall a few weeks ago NZ volcano Raoul Island erupted killing a Department of Conservation worker on the island. I just want to confirm no body has been found. Rob

Thanks for that update, Rob. Yes, I noticed that fatality. Volcanoes have killed a good number of people I know. Was there no warning?

I got Rob's pictures up at http://spring.net/geo/rob/ Funny thing. I created that page for Rob and went to save it. And I forgot what directory I was in and saved it right over the top of the geo main page. Oh boy. At first, I rushed off to the Wayback Machine and grabbed an old copy of the geo main page and installed it. Then I realized that just last Sunday I got a new server up and running and copied every single file from the Spring on to it. So I just went over there and found last Sunday's geo main page and used that. http://spring.net/geo/index.wayback.html is the page I dug out of the history archives. But it would have been out of date.

That is the link on Geo's front page that John of Greece created for his earthquake research data and other things not Geo conference. We'd never have gotten back here if you had done that. Please be careful. I love goback but it needs to go back to http://www.spring.net/yapp-bin/restricted/browse/geo/all or http://www.spring.net/yapp-bin/restricted/browse/geo/all/new. How big is this file? I may need to make a copy of it for myself. I can'r bear to think of it just disappearing because someone went "oops"

Well, with the new server I have everyhing backed up daily. And I'll be adding another backup server as well.

As you walk back, you feel the earth moving beneath your feet. It is a kind of constant background rumble like an approaching train might make. You know from past experience that it is the multitude of earthquakes that accompany any volcanic eruption. The earth has been wrenched apart and liquid magma has forced itself to the surface. Gases trapped in the magma now burst free creating noxious fumes and an impressive cloud over the main vents. Still the movement continue. At the rate magma is leaving the vent, you think it will stop soon since there just can't be that much molten rock down there. Time for an aside. If you can see molten rock, it is lava. If it is still underground but molten, it is magma. The sound behind you is nothing like you expected. I'm not sure what I expected, but it sounded like hundreds of jet engine tethered just out of sight at full blast. The taste is strangely like dried celery leaves and so is the smell of the night rain on the hot rocks. Inside the observatory, little knots of people are discussing what they know and what they have just seen, Coffee is unnecessary. There is nothing quite like a rawness of a new eruption to keep your senses alert, especially when you have just gotten to where you could see it. The seismographs are busy hitting the pins on either side of each drum. We are too close to the source of the motion to get anything like reliable measurements from these seismographs, but it is fun to watch them batting around making wild arcs on the paper. A ranger nearby is watching one of the staff geologists making a map. Now we will all know exactly where that fountain activity is happening and how close to it we will be allowed to go.

how do you remember this with such detail? amazing, i can almost smell everything!

Many years of attending eruptions and enthusiastic curiosity has made the whole experience a permanent part of my memory. As this progresses, more and more different eruptions will be brought into play. They are never the same, twice. When you see rock - that really hard stuff that mountains are made of and that lasts "forever" - in molten form spraying high into the night sky as incandescent fountains, or see the rivers of lava oblitering everything in its path, it is not like any other experience. This taffy-like substance will surely never build great mountains or even be inhabitable. Everything your mind knows about Earth rebels at such a suggestion. So you watch... fascinated. If you ever thought a fireplace hypnotic, you can imagine the fascination of a Hawaiian volcano eruption. Only one person we have taken to see such events has ever just stayed in the car and not wanted to see or experience it at all. My mother.

Mount Merapi, which has been smouldering for three weeks, is threatening to erupt on the Indonesian island of Java. The volcano has been spewing gasses, ash and lava, prompting officials to raise the threat status to the highest level. ...

Kia Ora Gunung Merapi (local name)is on a roll. The gas flows referred to in some reports were pyroclastic surges. There is a lava dome in the summit crater and it is still expanding. Yahoo News has been good at covering it, and the regular media are doing okay too. Rob

Interesting tv coverage plus fantastic internet images. Indonesia is a very volcanically unstable place. Keep watching!

http://www.geonet.org.nz/volcano/volcams.html Remote cameras are an important aid to our volcanologists. They allow them to quickly assess the status of the volcanoes, especially if they have recently recorded unusual seismic events or there have been reports of eruptions. A set of images from the last twenty-four hours may be displayed for each camera site by clicking on the volcano links at the right-hand side of this page. Larger versions of the latest seismograph recordings may be displayed by clicking on the thumbnail seismic drums. White Island from Whakatane. White Island from Whakatane. White Island Crater (floor). White Island Crater (floor). White Island Crater (rim). White Island Crater (rim). White Island Seismic Drum. White Island Seismic Drum. Ngauruhoe Volcano. Ngauruhoe Volcano. Ngauruhoe Seismic Drum. Ngauruhoe Seismic Drum. Ruapehu Volcano. Ruapehu Volcano. Ruapehu Seismic Drum. Ruapehu Seismic Drum. Taranaki (Egmont Volcano). Taranaki (Egmont Volcano). Taranaki Seismic Drum. Taranaki Seismic Drum. The images from the cameras are made possible with the support of the following organisations: * Environment Bay of Plenty * Heli Pro (New Zealand) * Mountain Air * PeeJay Charters * Taranaki Regional Council * Volcanic Air Safaris * Vulcan Helicopters * White Island Trust GNS Science EQC (Earthquake Commission) from the above web page.

Fathers Day this year (June) began a new episode in the Kilauea eruption of 1983 cycle. You can watch it happen http://hvo.wr.usgs.gov/cam3/ Photos are best a night since the glowing lava is more apparent. I will write more on this. It has been very exciting. But, mostly, I do not miss being there.

Thank you William for finding my way into here. I thought it was here where my visit-the-volcano appeared but I could not find it. But, I continue...

It is finally our lucky day. The most violent stages of the eruption have died down a bit and the earth under your feet have taken to gentle movements in less frantic fashion. Now, with your pockets stuffed with snacks, a flashlight attached to your belt and a water bottle on your hip you are ready to file in orderly fashion after the lead Park Ranger who is opening the trail for you. You hae a small group of dedicated people who waited with you and discussed other eruptions they had seen while the wait went on... and on. You leave the Volcano Observatory in a train of cars behind the Ranger car. It is on a roadway where we are going but there is little room there for parking so we are taken in small groups of 20 or so and the rest wait their turn at the observatory like we did.

Not even Christmas morning can bring on the excitment of being one of the first cars down the road to a new eruption. The road is often wiggly where it once was straight, and there are ominous cracks of measurable width across them and you have to negotiate as lightly as possible your way down the fractured paving. The fragrance of burning asphalt comes to you strongly as you get close, and finally you are allowed to turn around and park. All cars must be facing out of the danger ares for quick retreat should the situation change. It is night but the sky is a dark blood red and suddenly over the shoulders of the people in front of you you see incadescent globs of lava being lofted high into the air. We are there !

(As far as I know, no one but the Hawaii Volcanoes Observatory scientists have been allowed into the field to see the current new eruptive phase, but this is a little like what they are going through. There are excellent pictures on the website of HVO and if you look at night you will see similar scenes to the ones I am describing.)

YOu forget about the grit between your back teeth and the itchy grit falling down the back of your neck and you walk too rapidly for the Ranger. He calls you back and you walk as patiently as possibly behind him trying to see where you are going. If it is in a pit crater you will be looking far across a gigantic hole in the ground to see anything (like my first eruption was. If it is down an incline out on the older lava flows, you are fortunate and will be able to get as close to it as you can. They allow you to do this since 2000 degree (F) rock is so hot it makes its own force field of heat and you can't get too close. You might try to pick up a piece of new lava nearby to look at it more closely but it will burn your fingers (It really does !) You can be there for long enough to listen to what it sounds like, to be aware of how it tastes, how the various colors of black thru red to yellow and white hot merge and blend into the velvet of the night.

I t sounds interesting. Are you still in Hawaii?

NO, I am in the midwest permanently or as permanently away from Hawaii as I can get. Hawaii is a strange place. One should never try to live in Paradise lest all you find, finally, are the snakes.

I do miss the night hikes to see eruptions, though.

Well, at least you got a taste of Hawaii, and learned from it.

Oh indeed and now folks you can watch the summit glow of a crater that appeared when the summit had a minor explosive event. The pit is several hundred feet deep and has been quite bright at night. It makes a great night light to leave it on as your desktop. http://hvo.wr.usgs.gov/cam3/