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ARCHIVED REPORT
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KOROVIN



At about 10 am ADT this morning, AVO received a report of an eruption of Korovin volcano from a ground observer in the village of Atka. The crew of a Coast Guard C-130 confirmed a plume to 16,000 feet (4877 m) ASL at 10:30 am ADT. Local winds at the time were light and to the south southwest, and a dusting of ash was reported in Atka. The low level ash and steam plume was not visible in satellite imagery. Korovin volcano is located on the north end of Atka Island in the central Aleutians, 538 km (334 miles) west of Dutch Harbor. It is 21 km (13 miles) north of the village of Atka, population about 100. Korovin is a 1533-m-high (5029 ft) stratovolcano with a basal diameter of 7 km (4 miles). The last reported eruption was in March, 1987.



AVO does not maintain seismic monitoring equipment on Atka. AVO will continue to monitor the situation closely using satellite and field observations.

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].

PDF version of these definitions
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URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: May 27, 2014 10:23
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