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ALASKA VOLCANO OBSERVATORY
Monday, April 26, 2004 2:30 PM ADT (22:30 UTC)
MOUNT 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
Activity continues at Mount Veniaminof, and is characterized by episodes of
steam and ash emissions and small volcanic earthquakes. A newly installed
internet camera based in Perryville allows AVO to observe the volcano
during clear weather. On the afternoon and evening of April 25, more than
25 small steam and ash emissions were seen during an 8-hour time period,
producing clouds that rose 1000-2000 ft above the active cone (~8,000 to
9000 ft or ~2,400 to 2700 m above sea level). These clouds typically were
confined to the summit caldera, but could pose a hazard to people and
low-flying aircraft in the immediate vicinity of the active cone. We
expect that steam and ash emissions may continue intermittently, but this
does not indicate that more vigorous activity is imminent or even likely.
AVO will continue to monitor activity at Mount Veniaminof using seismic
data, satellite images, internet camera data and observer reports.
Mount 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 (~ 300 km3) and most active volcanic
centers in the Aleutian Arc and has erupted at least 12 times in the past
200 years. The most recent significant eruption of the volcano occurred in
1993-95 and was a moderate Strombolian eruption from the main intracaldera
cone in the northwest sector of the caldera above Cone Glacier. The
eruption was characterized by intermittent low-level emissions of steam and
ash, and a small lava flow was extruded into the summit caldera ice field
producing an ice pit. Minor explosions producing small ash clouds very
similar to those observed this week also occurred in 2002. Previous
historical eruptions have produced ash plumes that reached 6,000 m (20,000
ft) above sea level and ash fallout that blanketed areas within about 40 km
(25 mi) of the volcano.
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.