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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

INFORMATION RELEASE

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:

http://vulcan.wr.usgs.gov/Hazards/Safety/what_to_do_during_ashfall.html or

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

level.





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



CONTACT INFORMATION:



Tom Murray, Scientist-in-Charge, USGS

tlmurray@usgs.gov (907) 786-7497



John Eichelberger, Coordinating Scientist, UAF-GI

eich@gi.alaska.edu (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.

VOLCANO ALERT LEVELS
NORMAL
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
ADVISORY
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
WATCH
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway but poses limited hazards.
WARNING
Hazardous eruption is imminent, underway, or suspected.

AVIATION COLOR CODES
GREEN
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
YELLOW
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway with no or minor volcanic-ash emissions [ash-plume height specified, if possible].
RED
Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].

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Page modified: May 27, 2014 10:23
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