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ALASKA VOLCANO OBSERVATORY
Friday, November 22, 2002 10:30 PM AST (19:30 UTC)
MT. VENIAMINOF VOLCANO (CAVW #1102-07)
Summit Cone Elevation 7,073 ft (2,156 m)
Current Level of Concern Color Code: GREEN.
Seismicity remains above background at Veniaminof, but is at levels notably lower than in September when the color code was raised to Yellow. AVO has received no pilot reports or other observations of activity at Veniaminof since early October. Similarly, AVO has not detected thermal anomalies in any clear satellite views of the volcano. Thus the Level of Concern Color Code for Veniaminof is GREEN. While in its current state of activity, low-level steaming and minor ash emissions may periodically occur. This will be the last report on Veniaminof unless increased activity is observed. AVO will continue to monitor the situation closely.
Mt. Veniaminof volcano is an andesitic stratovolcano with an ice-filled, 10-km diameter summit caldera located on the Alaska Peninsula, 775 km (480 mi) southwest of Anchorage and 35 km (22 mi) north of Perryville. Veniaminof is one of the largest and most active volcanoes in the Aleutian Arc and has erupted at least 12 times in the past 200 years. The most recent eruption occurred in 1993-95 and was a moderate Strombolian eruption from a cinder and spatter cone in the northwest sector of the caldera. The eruption was characterized by intermittent, low-level emissions of steam and ash and production of a small lava flow that melted a pit in the caldera ice field. Previous historical eruptions have produced ash plumes that reached 6,000 m (20,000 ft) above sea level and ash fallout that affected areas within about 40 km (25 mi) of the volcano.
For additional information and photographs of recent historical eruptions at Veniaminof, please visit our web site: http://www.avo.alaska.edu/avo4/atlas/Veniaminof.htm
OTHER ALASKAN VOLCANOES
Seismic activity is monitored in real time at 24 volcanoes in Alaska. Satellite images of all Alaskan volcanoes are analyzed daily for evidence of ash plumes and elevated surface temperatures. Some volcanoes may currently display anomalous behavior but are not considered to be at a dangerous level of unrest.
Wrangell, Spurr, Redoubt, Iliamna, Augustine, Snowy, Griggs, Katmai, Novarupta, Trident, Mageik, Martin, Aniakchak, Pavlof, Dutton, Isanotski, Shishaldin, Fisher, Westdahl, Akutan, Makushin, Great Sitkin, and Kanaga volcanoes are in color code GREEN. All are at or near normal levels of background seismicity. AVO did not detect ash plumes or significant elevated surface temperatures in the vicinity of any volcano.