Printer friendly versionALASKA VOLCANO OBSERVATORY
Friday, December 30, 2005 11:00 AM AKST (2000 UTC)
56.1956°N 159.3883°W, Summit Elevation 8225 ft (2507 m)
Current Level of Concern Color Code: GREEN
Seismic activity at Veniaminof Volcano has been at background levels for several weeks. Cloudy conditions have persisted for most of the previous month preventing views of the volcano by satellite, web camera, and ground observers. However, brief views showed no activity. AVO has recieved no reports of ash emissions from pilots or observers on the ground. Given the decline of the seismicity it appears that the most recent episode of activity has ended, although based on the past behavior of the volcano, low level ash and steam emissions in the vicinity of the active cone may return at any time with little or no warning. The Level of Concern Color Code for Mount Veniaminof Volcano is thus downgraded from yellow to GREEN.
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 13 times in the past 200 years. Recent significant eruptions of the volcano occurred in 1993-95 and 2005. Both were moderate Strombolian eruptions producing intermittent low-level jets of incandescent lava fragments, and low-level emissions of steam and ash from the main intracaldera cone. During the 1993-95 activity, a small lava flow was extruded into the summit caldera ice field producing an ice pit. Minor ash-producing explosions occurred in 2002, 2004, early 2005, and in recent weeks. 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 occurring
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
Jon Dehn, Acting Coordinating Scientist, UAF-GI
email@example.com (907) 474-7131
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.