Volcanic Activity ReportEarth Changes News |
The alert-level system for all volcanoes monitored by the USGS was changed on 1 October from a numerical system to a descriptive system. In the new system, alert-level Normal indicates background conditions and is equivalent to aviation color-code Green. The previous alert levels of Volcanic Unrest (Alert Level 1), Volcano Advisory (Alert Level 2) and Volcano Alert (Alert Level 3) have changed to "Advisory," "Watch," and "Warning," respectively. There is a subtle change to the aviation color-code definitions in that there is no longer an ash-plume threshold given for either Orange or Red. Watch; Aviation color code ORANGE." The alert-level "Watch" is used for two different situations: (1) heightened or escalating unrest indicating a higher potential that an eruption is likely, but still not certain; or (2) an eruption that poses only limited hazard.
ABBREVIATED COLOR CODE KEY :
GREEN volcano is dormant; normal seismicity and fumarolic activity occurring = Normal
YELLOW volcano is restless; eruption may occur
ORANGE volcano is in eruption or eruption may occur at any time
RED significant eruption is occurring or explosive eruption expected at any time
Source - National Geographic News - Sept. 10, 2008: The magma reservoir beneath Mount Vesuvius has been migrating toward the surface over the past 20,000 years, according to a study. Magma pools at shallower depths are less volatile and less likely to produce violent eruptions, according to a research team led by Bruno Scaillet of the Université d'Orléans in France. Magma reservoirs hold a replenishing supply of lava, which is unleashed during volcanic eruptions. A reservoir's location and characteristics offer clues to the severity of future eruptions. ...
2008-08-25 - Seismic activity at Kasatochi volcano continues. In the past 24 hours earthquakes and periods of volcanic tremor have been detected by the AVO seismic network on Great Sitkin Island 25 miles west of Kasatochi. On Sunday, August 17, people on Adak reported smelling sulfur and on Monday, August 18, clear satellite views showed a steam plume from the volcano's summit.
August 29th: Seismicity at Okmok volcano has been steadily declining for the past nine days and significant ash plumes have not been observed since August 19.
2008-08-20 - Weak repetitive seismic events continue to be observed intermittently. Satellite observations have been obscured by clouds. Continued explosive activity remains possible.
SOUFRIERE HILLS Montserrat 16.72°N, 62.18°W; summit elev. 915 m
MVO reported that during 15-22 August, evidence suggested that the W side of the Soufrière Hills lava dome continued to grow. Cloud cover prevented visual observations. Rockfalls and long-period seismicity increased. Most of the rockfalls occurred on the W side of the lava dome in a new channel that developed below Gages Wall. Ash plumes occasionally generated by the rockfalls were most noticeable on 16 and 17 August. On 19 August a pyroclastic flow descended the Tar River Valley. According to news reports, on 25 August a rainfall-induced pyroclastic flow occurred on the W flank, split into two parts, and caused ashfall and a strong scent of gases in areas N. The event enlarged and steepened the rockfall gully below Gages Wall. The Hazard Level remained at 3.
BATU TARA Komba Island (Indonesia) 7.792°S, 123.579°E; summit elev. 748 m
Scientists on a boat passing Batu Tara about 24 km to the N observed six distinct eruptions of ash plumes from the westernmost area of the summit crater during a 45-minute period on 25 August. The plumes rose to an estimated altitude of 1.1-1.5 km (3,600-5,000 ft) a.s.l. and drifted W.
CHAITEN Southern Chile 42.833°S, 72.646°W; summit elev. 1122 m
Based on web camera views, pilot observations, and analysis of satellite imagery, the Buenos Aires VAAC reported that during 20-23 and 26 August ash plumes from Chaitén rose to altitudes of 2.1-3 km (7,000-10,000 ft) a.s.l. and drifted SE, E, and NE. A thermal anomaly over the lava dome was detected on satellite imagery during 22-23 August.
August 29th: Mount St. Helens has been at Volcano Alert Level NORMAL and Aviation Color Code GREEN for the past month; therefore, we are migrating from a Mount St. Helens weekly update to a Cascade Range weekly update. As long as all Cascade Range volcanoes are at Normal and Green, we will continue to issue Cascade Range weekly updates. If a Cascade Range volcano shows signs of unrest, we will issue an update for that particular volcano. Activity Update: All volcanoes in the Cascade Range are at normal levels of background seismicity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; Mount Hood, Mount Jefferson, Three Sisters, Newberry Volcano, and Crater Lake, in Oregon; and Medicine Lake, Mount Shasta, and Lassen Peak in northern California.
FUEGO Guatemala 14.473°N, 90.880°W; summit elev. 3763 m
INSIVUMEH reported that on 20 August lahars descended several rivers to the S and SE of Fuego, carrying fine material as well as blocks up to 1 m in diameter. Strong currents in Río Cenizas and El Jute were noted. During 25-26 August, explosions produced ash plumes that rose to an altitude of 4.1 km (13,500 ft) a.s.l. and drifted SW. Fumarolic plumes rose to an altitude of 4 km (13,100 ft) a.s.l. and also drifted SW. A 300-m-long lava flow traveled W towards the Santa Teresa ravine
LLAIMA Central Chile 38.692°S, 71.729°W; summit elev. 3125 m
SERNAGEOMIN reported that steam plumes from the pyroclastic cones in Llaima's main crater were visible during periods of clear weather on 16 August. Steam plumes rose from the W flank where lava flows were active in February and July. On 17 August, sporadic gas-and-ash emissions were observed. Cloud cover prevented observations during 18-20 August. On 21 August, three explosions produced ash plumes that rose to an altitude of 3.6 km (11,800 ft) a.s.l. and drifted E. Gas and steam was emitted in between explosions; resultant plumes rose to an altitude of 3.4 km (11,200 ft) a.s.l. and drifted 9 km E. During an overflight, scientists observed steam-and-gas plumes being emitted from a small crater in the N sector of the main crater. A larger crater, about 100 m in diameter, in the central sector emitted ash. The ash plumes rose to an altitude of 3.4 km (11,200 ft) a.s.l. and drifted E. A thin layer of ash blanketed the E flank. Ash-and-gas plumes from the main crater drifted W on 22 August. On 23 August, observers reported that incandescent material was ejected less than 1 km above the crater. The next day, an ash plume drifted about 1.5 km SSE. Ash blanketed some areas of the flanks. The Volcanic Alert Level remained at Yellow.
NYIRAGONGO Democratic Republic of Congo 1.52°S, 29.25°E; summit elev. 3470 m
Based on analysis of satellite imagery, the Toulouse VAAC reported that an eruption of unstated character from Nyiragongo occurred before 0300 on 2 September. The activity was not confirmed by ground observations. Nyiragongo's frequently active lava lake is often detected on MODIS satellite thermal imagery. Alert Status = Yellow. With its deep lava lake and ongoing eruptive status, this is a volcano to keep a close eye on.
PACAYA Guatemala 14.381°N, 90.601°W; summit elev. 2552 m
INSIVUMEH reported that during 21-26 August, fumarolic plumes from Pacaya's MacKenney cone rose to an altitude of 3.2 km (10,500 ft) a.s.l. and drifted W and SW. Incandescence from the crater was occasionally seen at night. Lava flows on the SW flank branched and traveled a maximum of 300 m; lava continued to fill in the area between MacKenney cone and Cerro Chino crater to the N. Avalanches occurred from the lava-flow fronts on 26 August.
RABAUL New Britain 4.271°S, 152.203°E; summit elev. 688 m
RVO reported that ash plumes from Rabaul caldera's Tavurvur cone continued to be emitted during 18-22 August, although less so than during 16-18 August. Some prolonged ash-free intervals were immediately followed by explosions that produced ash plumes. The plumes drifted NW and caused ashfall in areas downwind. Occasionally incandescence at the summit was observed and roaring noises were heard. Explosions also ejected incandescent lava fragments. Based on analysis of satellite imagery, the Darwin VAAC reported that on 23 August ash plumes rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted NW.
SANTA MARIA Guatemala 14.756°N, 91.552°W; summit elev. 3772 m
INSIVUMEH reported that during 21-26 August explosions from Caliente, a unit of Santa María's Santiaguito lava dome complex, produced ash plumes that rose to altitudes of 2.8-3.3 km (9,200-10,800 ft) a.s.l. and drifted S, SW, and W. Constant degassing was noted.
TUNGURAHUA Ecuador 1.467°S, 78.442°W; summit elev. 5023 m
The IG reported that on 19 August fumarolic plumes from Tungurahua rose 20 m above the NE crater and on 20 August, steam-and-ash plumes rose about 50 m above the crater. On 21 August, intense rains prompted the Tungurahua Observatory (OVT) to issue a warning of potential lahars in the Vascún river. A natural dam in the river was previously identified as potentially hazardous. On 23 August, a person in El Salado detected vibrations. The dam ruptured and material descended the Vascún river to the N at speeds of 10-15 m/s, destroying a house, damaging and demolishing bridges, and destroying multiple public swimming pools in the Baños area. Two people were injured and two people were missing.
Giant Undersea Volcano Found Off Iceland
National Geographic News - April 22, 2008: A giant and unusual underwater volcano lies just offshore of Iceland on the Reykjanes Ridge, volcanologists have announced. The Reykjanes formation is a section of the Mid-Atlantic Ridge, which bisects the Atlantic Ocean where the North American and Eurasian tectonic plates are pulling apart.
Video: Ecuador Volcano Erupts:The Tungurahua volcano in Ecuador erupted again this week. The volcano has been active on and off since 1999.
Ecuador Volcano Erupts, Thousands to Be Evacuated: Ominous rumblings from the Tungurahua volcano has prompted evacuation orders for 3,000 nearby villagers by officials fearing a repeat of a 2006 disaster. Current status is Orange (Feb. 28, 2008)
Volcanic eruption may be linked to quakes - October 17, 2007:Scientists are setting up seismographs in a wilderness region of the British Columbian Interior today to determine if a pending volcanic eruption is the cause of hundreds of small earthquakes the area has been experiencing non-stop since last week. Volcano Information
| |
|
POPOCATEPETL México 19.023°N, 98.622°W; summit elev. 5426 m
CENAPRED reported that emissions of steam and gas from Popocatépetl were visible during 6-12 February. The plumes occasionally contained slight amounts of ash. On 8 February, ash emissions were occasionally accompanied by explosions and propelled incandescent fragments that landed in the vicinity of the crater. Two explosive events on 11 February resulted in ashfall in the town of Huejotzingo, Puebla.
Geologic Summary. Popocatépetl, whose name is the Aztec word for smoking mountain, towers to 5,426 m 70 km SE of Mexico City and is North America's second-highest volcano. Frequent historical eruptions have been recorded since the beginning of the Spanish colonial era. A small eruption on 21 December 1994 ended five decades of quiescence. Since 1996 small lava domes have incrementally been constructed within the summit crater and destroyed by explosive eruptions. Intermittent small-to-moderate gas-and-ash eruptions have continued, occasionally producing ashfall in neighboring towns and villages.more than 8000 people to be evacuated amid fears of an imminent eruption, according to officials.
Friday, August 29, 2008 07:34 HST (Friday, August 29, 2008 17:34 UTC)
KILAUEA VOLCANO, HAWAII (CAVW#1302-01-)
19.42°N 155.29°W, Summit Elevation 4091 ft (1247 m)
Volcano Alert Level: WATCH
Aviation Color Code: ORANGE
Friday, August 29th: This report on the status of Kilauea volcanic activity, in addition to maps, photos, and webcam images, was prepared by the USGS Hawaiian Volcano Observatory (HVO). Hawai`i Volcanoes National Park status can be found at http://www.nps.gov/havo/ or 985-6000. Hawai`i County Viewing Area status can be found at http://www.lavainfo.us or 961-8093.
Activity Summary for last 24 hours: Kilauea summit continued to produce small amounts of ash and elevated amounts of sulfur dioxide gas from the Halema`uma`u vent. At the east rift eruption site, Pu`u `O`o cone continued to produce high amounts of sulfur dioxide gas; lava flows through tubes to the ocean.
Last 24 hours at Kilauea summit: The Halema`uma`u vent was very noisy yesterday with multiple rock impact sounds becoming frequent and loud in time with the episodic seismic tremor bursts. Some of these sounds were heard by NPS eruption crew personnel at Jaggar Museum overlook. In the evening, incandescence could be seen to also pulse in time with those bursts; the brightness decreased considerably after 1 am, just after the episodic tremor bursts stopped (see below).
This morning, the white plume is rising from the vent and being blown southwest over the Ka`u Desert. Ash production continued; the collection this morning included increased amounts of volcanic glass material in the form of small tears and blobs, delicate and coarse hair, and irregular shreds, some like twisted braids and some in irregular shapes. Wall rock and alteration fragments were still part of the mix.
Sulfur dioxide emission rates remained elevated and variable; the most recent average measurement was 700 tonnes/day on August 28 compared to a pre-2008 background rate between 150-200 tonnes/day.
The summit tiltmeter network recorded minor oscillations. The network of GPS receivers that span the summit recorded weak contraction across the caldera.
Episodic seismic tremor stopped at 00:45 am this morning, after having been nearly continuous for more than 48 hours; this morning, tremor levels resumed at values nearly identical to those before the episodic tremor began. The number of RB2S2BL earthquakes beneath Halema`uma`u Crater decreased but are still well above background values of 40/d. Forty two earthquakes were located beneath Kilauea, 31 of them beneath the summit caldera focused on the Halema`uma`u vent, 6 on south flank faults, 5 on Koa`e faults, andfour beneath the southwest rift zone.
Last 24 hours at the middle east rift zone vents and flow field: Magma continued to degas through Pu`u `O`o Crater resulting in an emission of 1,500 tonnes/day of sulfur dioxide on August 28, down from a high of 7,100 tonnes/day on July 18 and near background values of about 2,000 tonnes/day. No incandescence was observed overnight within the crater.
The tiltmeter on the north side of Pu`u `O`o cone recorded minor oscillations. GPS receivers recorded no change in distance across the crater. Seismic tremor levels are at low values near Pu`u `O`o and the TEB vent.
Lava from the TEB vent and the rootless shield field flows through tubes to the ocean. Yesterday, HVO geologists found no active surface flows anywhere on the flow field; Waikupanaha ocean entry was generating a strong steam plume with no explosions evident. There had been a bench collapse sometime between Monday and Thursday, most likely at around 10 pm on Wednesday night, August 27, based on seismic evidence. No incandescence was observed overnight from rift zone to the top of the pali above the abandoned Royal Gardens subdivision. GOES-WEST imagery shows a prominent coastal steam plume blowing offshore at 6:15 am.
Listen to a podcast interview with Dr. Eichelberger describing the activity at Kilauea in episode 35 of CoreCast at http://www.usgs.gov/corecast/.
Long Valley Caldera August 29th: Volcanic-Alert Level NORMAL - Aviation Color Code GREEN
The real-time computer system located three small earthquakes in the vicinity of Long Valley caldera since the last update at 9:04 AM (PDT) on August 28. Two were located in the Round Valley area and the other in the Sierra Nevada south of the caldera. All had magnitudes less than M=2.0.
Long Term Trends:
Seismic Trend: Earthquake activity within and adjacent to the caldera has remained low since mid-1999 averaging just five to ten earthquake per day with magnitudes less than M=2 and an occasional event as large as M=3. see details.
Deformation trend: Renewed uplift of the resurgent dome that began in early 2002 ended in early 2003 largely offsetting the 2 cm of subsidence that accumulated from early 1999 through the end of 2001. The resurent dome has since shown minor fluctuations in uplift and subsidence but remains roughly 80 cm higher than in the late 1970's. see details.
CO2 trend: The diffuse carbon dioxide gas flux in the Horseshoe Lake
tree-kill area has shown little change from the relatively high levels of
50 to 150 tons per day sustained for the past several years
21-Nov-2006: Volcanic eruptions in high latitudes can greatly alter climate and distant river flows, including the Nile, according to a recent study funded in part by NASA. Researchers found that Iceland's Laki volcanic event, a series of about ten eruptions from June 1783 through February 1784, significantly changed atmospheric circulations across much of the Northern Hemisphere. This created unusual temperature and precipitation patterns that peaked in the summer of 1783, including far below normal rainfall over much of the Nile River watershed and record low river levels. Full Article Here
By Andrea Thompson, LiveScience Staff Writer: 08 November 2007 02:00 pm ET
Yellowstone's ancient volcanic floor has been rising since mid-2004 because a blob of molten rock the size of Los Angeles infiltrated the system 6 miles beneath the surface, scientists say, but there is no risk of an eruption.
Yellowstone National Park is the site of North America's largest volcanic field, which is produced by a hotspot, or gigantic plume of hot, molten rock, that begins at least 400 miles (643 kilometers) beneath Earth's surface and rises to 30 miles (48 kilometers) underground, where it widens to about 300 miles across.
Monday, August 4, 2008
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN
JULY 2008 Yellowstone Seismicity Summary: During the month of July 2008, 185 earthquakes were located in the Yellowstone region. The largest event was a magnitude 2.5 on July 31 at 7:22 AM MDT, located about 6 miles southwest of Madison Junction, WY. The event is part of an ongoing swarm of 132 earthquakes on the Madison Plateau, July 28-31, with magnitudes -0.2 to 2.5.
Earthquake activity in the Yellowstone region is at relatively low background levels.
Ground Deformation Summary: Through July 2008, continuous GPS data show
that most of the Yellowstone caldera continued moving upward, though at
a lower rate than the past several years. The maximum measured ground uplift
over the past 48 months is ~20 cm at the White Lake GPS station. An example
can be found at: http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots×eries=raw
An article on the current uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/2007/upsanddowns.html
Magnitude 4.1 occurred at 05:59 AM on March 25, 2008 (MDT) in Yellowstone National Park - 03/25/2008
The University of Utah Seismograph Stations reports that a light earthquake
of magnitude 4.1 occurred at 05:59 AM on March 25, 2008 (MDT) in Yellowstone
National Park. The epicenter of the shock was located 29.8 km (18.6 mi)
NE of Fishing Bridge, WY. Two earthquakes of magnitude 3.0 or greater have
occurred within 25 km of the epicenter of this event since 1962. The largest
of these events was a magnitude 3.5 on July 20, 1992, 6.4 km (4.0 mi) NE
of Fishing Bridge, WY. No earthquakes of magnitude 4.5 or greater have occurred
within 50 km of the epicenter of this event since 1962. This event has been
reported felt in Pahaska Tepee, outside the east entrance to Yellowstone
National Park and in southwest Montana as well as in western Wyoming.
46.20°N 122.18°W, Summit Elevation 8363 ft (2549 m)
Volcano Alert Level: ADVISORY
Aviation Color Code: YELLOW
As of the 3rd of May, the Cascades Volcano Observatory (CVO) reported that the pause in lava dome growth continues, and all of CVO's monitoring instruments show trifling or nil volcanic-related activity. This pause, which began in late January 2008, was recognised by absence of measurable growth among successive fixed-camera images, nearly quiescent seismicity, and the absence of tilt signals that might characterise extrusion of lava from the conduit.
RECENT OBSERVATIONS: Only three micro-earthquakes were located by the Pacific Northwest Seismograph Network over the last week, and other monitoring data showed no changes.
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. Frequent Q & A on Mt. St. Helens
Telephone recordings with the latest update on Mount St. Helens and phone contacts for additional information can be heard by calling: (360) 891-5180.
Q: How big is the new lava dome ???. The volume of the new lava dome as measured July 5, 2007, was 122 million cubic yards (volume is equivalent to 150 to 200 large sports stadiums) and was growing at an average rate of 0.14 cubic yards per second (nearly equivalent to filling 4 Olympic-sized swimming pools every day ...more
For additional information, background, images, and other graphics: http://vulcan.wr.usgs.gov/Volcanoes/MSH/Eruption04/
For seismic information: http://www.pnsn.org/HELENS/welcome.html
For a definition of alert levels: http://vulcan.wr.usgs.gov/Volcanoes/Cascades/CurrentActivity/volcano_warning_scheme.html
For a webcam view of the volcano: http://www.fs.fed.us/gpnf/volcanocams/msh/
November 22, 2006
The current eruption of Washington State's Mount St. Helens, which began about two years ago, has been marked by a series of weak, shallow earthquakes, or "drumbeats," that occur every couple of minutes, a new study says. The "slip/stick" motion of the rocky "plug" being pushed out of the volcano is causing those rhythmic quakes, according to scientists from the Cascades Volcano Observatory in Vancouver, Washington
KRAKATAU Indonesia 6.10°S, 105.43°E; summit elev. 813 m: According to news articles, gas-and-ash plumes from Anak Krakatau continued rise and seismicity was elevated during 9-11 November. Incandescent material was propelled from the summit and fell onto the flanks. Lava flows were also observed traveling down the flanks. Villagers and tourists were advised not go within a 3-km radius of the summit. The Alert Level remained at 3 (on a scale of 1-4).
KELUT Java, Indonesia 7.93°S, 112.31°E; summit elev. 1,731 m: CVGHM reported that on 6 November, temperatures at the surface of Kelut's crater lake measured 75 degrees Celsius and the newly exposed lava dome surface measured 150-210 degrees Celsius. Plumes inhibited clear views of the lava dome. CVGHM lowered the Alert Status of Kelut on 8 November from 4 to 3 (on a scale of 1-4), due to a decrease in seismicity and stability indicated by deformation-monitoring instruments. CVGHM recommended that evacuees could return to their homes, but activity within a 3-km radius was restricted.
Oct. 3 , 2006: In June 1912, Novarupta-one of a chain of volcanoes on the Alaska Peninsula-erupted in what turned out to be the largest blast of the twentieth century.Almost a hundred years later, researchers are paying attention. Novarupta is near the Arctic Circle and its impact on climate appears to be quite different from that of "ordinary" tropical volcanoes, according to recent research by climatologists using a NASA computer model.
When a volcano anywhere erupts, it does more than spew clouds of ash, which can shadow a region from sunlight and cool it for a few days. It also spews sulfur dioxide. If the eruption is strongly vertical, it shoots that sulfur dioxide high into the stratosphere more than 10 miles above Earth.
Up in the stratosphere, sulfur dioxide reacts with water vapor to form sulfate aerosols. Because these aerosols float above the altitude of rain, they don't get washed out. They linger, reflecting sunlight and cooling Earth's surface.
This can create a kind of nuclear winter (a.k.a. "volcanic winter") for a year or more after an eruption. In April 1815, for instance, the Tambora volcano in Indonesia erupted. The following year, 1816, was called "the year without a summer," with snow falling across the United States in July. Even the smaller June 1991 eruption of Pinatubo in the Philippines cooled the average temperature of the northern hemisphere summer of 1992 to well below average.
But both those volcanoes as well as Krakatau were in the tropics.
Novarupta is just south of the Arctic Circle.
For Complete Story - http://science.nasa.gov/headlines/y2006/03oct_novarupta.htm
2008-08-25 - Seismic activity at Kasatochi volcano continues. In the past 24 hours earthquakes and periods of volcanic tremor have been detected by the AVO seismic network on Great Sitkin Island 25 miles west of Kasatochi. On Sunday, August 17, people on Adak reported smelling sulfur and on Monday, August 18, clear satellite views showed a steam plume from the volcano's summit.
2008-08-20 - Weak repetitive seismic events continue to be observed intermittently. Satellite observations have been obscured by clouds. Continued explosive activity remains possible.
|
VENIAMINOF VOLCANOAviation Color Code - Volcano Alert Level - OFF ALERT As of the 3rd of May, the Alaska Volcano Observatory (AVO) has reported to INTLVRC that seismic data show that low level volcanic unrest continues at Mt. Veniaminof volcano. |
 |
PAVLOF VOLCANOCurrent Aviation Color Code: OFF ALERT Current Volcano Alert Level: |
585 mi (941 km) from Anchorage Elevation: 8261 ft (2518 m) Latitude: 55.4159° N Longitude:161.89° W
2007-10-01 - Information Release
A pause in eruptive activity at Pavlof continues. Seismicity remains at low levels and has been relatively unchanged since about September 13. Mostly cloudy conditions obscure the volcano from satellite and web camera views today.
Rockfall from the unstable front of the lava flow remains a hazard on
the southeast flank of the volcano and small dust/ash plumes could be generated
but are not likely to rise above the summit of the volcano. Small lahars
could be generated down drainages below the lava flow should hot rockfall
debris contact snow and ice.
 |
KOROVIN VOLCANO (ATKA ISLAND)Current Aviation Color Code: OFF ALERT Current Volcano Alert Level: |
52°22'48" N174°9'22" W, Summit Elevation 5030 ft (1533 m)
Sept. 21, 2007: Off alert status.
Korovin has erupted several times in the past 200 years, most recently in 1998. Eruptions typically produce minor amounts of ash and occasional, small lava flows. Ash plume heights could exceed 20,000 ft above sea level. Korovin occasionally produces large steam plumes from its summit.
 |
CLEVELAND VOLCANOCurrent Aviation Color Code: YELLOW Current Volcano Alert Level: Advisory |
52°49'20" N169°56'42" W, Summit Elevation 5676 ft (1730 m)
AVO reported that cloud cover prevented satellite observations of Cleveland during 20-26 August, although a possible thermal anomaly was present on 24 August.
2007-10-01 - Status Report
Current Aviation Color Code: OFF ALERT
Current Volcano Alert Level:
All other volcanoes in the Cascade Range are all at normal levels of background seismicity. These include Mount Baker, Glacier Peak, Mount Rainier, and Mount Adams in Washington State; Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake, in Oregon; and Medicine Lake, Mount Shasta, and Lassen Peak in northern California.
