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ALASKA VOLCANO OBSERVATORY
Thursday, February 24, 2005 11:55 AM AST (20:55 UTC)
KOROVIN VOLCANO (CAVW #1101-16)
52.381° N 174.154° W, Summit Cone Elevation 5,029 ft (1,533 m)
Current Level of Concern Color Code: YELLOW
Previous Level of Concern Color Code: GREEN
This morning, the Alaska Volcano Observatory (AVO) received a report of a
ash and steam emissions from Korovin Volcano on Atka Island, that occurred
at approximately 7:00 PM local time (8:00 PM AST) February 23, 2004.
According to residents of Atka village, the initial ash burst reached a
height of approximately 8,000 feet (2440m) above sea level and drifted
eastward. The initial burst was followed by several smaller ash and steam
bursts. No ash fall was reported in Atka village, nor were there any
reports of accompanying volcanic odors, earthquakes or volcanic explosions.
Satellite images of the volcano examined by AVO do not clearly show the
presence of ash or any thermal anomalies. Telephone conversations with
residents of Atka this morning (2/24/05) indicate that the volcano is
steaming with some vigor.
These observations indicate that a minor eruptive episode of Korovin
Volcano may be in progress and therefore AVO is raising the level of
concern color code of Korovin Volcano from Green to YELLOW.
Low-level steam and ash emissions may continue and could pose a hazard to
people and low- to medium-flying aircraft in the vicinity of the volcano.
If the eruption continues and begins to intensify, light ash fall could
occur on parts of Atka Island, including the village of Atka. Residents
should take the necessary precautions for dealing with an episode of ash
fall. Information about dealing with an ash fall event is contained on the
following internet site:
by contacting AVO.
Korovin Volcano is a 1553 m high stratovolcano located on the northern part
of Atka Island in the central Aleutian Islands, about 184 km (110 mi) east
of Adak, 538 km (350 mi) west of Dutch Harbor, and 1760 km (1100 mi)
southwest of Anchorage. The volcano has two distinct summit vents about 0.6
km apart, that have been the sites of eruptive activity as recently as
June, 1998. Korovin has erupted several times in the past 200 years,
including 1907, 1951, 1953, 1954, 1973, 1976, 1986, 1987, 1996, and 1998.
All of these eruptions produced minor amounts of ash and occasional but
small lava flows. Reports of the height of the ash plume produced by the
1998 eruption ranged from 4900 to 9200 m (16,000 to 30,000 feet) above sea
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.