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ALASKA VOLCANO OBSERVATORY
Friday, April 4, 2003 10:30 AM AST (1930 UTC)
MT. VENIAMINOF VOLCANO (CAVW #1102-07)
56°10'N 159°23'W, Summit Cone Elevation 7,073 ft (2,156 m)
Current Level of Concern Color Code: YELLOW
Seismic activity dramatically decreased at Mt. Veniaminof during the past
week. However, short periods of volcanic tremor and low frequency events
are still present at the volcano. Low-level steaming and minor ash
emissions may occur at any time. Satellite images observed during the last
week did not reveal any elevated surface temperatures, ash emissions or ash
deposits at the volcano.
The level of concern color code for Mt. Veniaminof will remain YELLOW. AVO
continues to monitor the situation closely, and will issue further updates
as information becomes available.
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 came from an intracaldera cinder
and spatter cone in the northwest sector of the caldera. The eruption was
Strombolian and 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 fall 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:
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
ABBREVIATED COLOR CODE KEY (contact AVO for complete description):
GREEN volcano is dormant; normal seismicity and fumarolic activity
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
VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu
RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478
Tom Murray, Scientist-in-Charge, USGS
firstname.lastname@example.org (907) 786-7497
John Eichelberger, Coordinating Scientist, UAF-GI
email@example.com (907) 474-5530
The Alaska Volcano Observatory is a cooperative program of the U.S.
Geological Survey, the University of Alaska Fairbanks Geophysical
Institute, and the Alaska Division of Geological and Geophysical Surveys.