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ALASKA VOLCANO OBSERVATORY INFORMATION STATEMENT
Wednesday, February 22, 2006 3:40 PM AKST (Thursday, February 23, 2006 00:40 UTC)


KOROVIN VOLCANO (CAVW #1101-16)
52°22'46" N 174°9'17" W, Summit Elevation 5030 ft (1533 m)
Current Volcano Alert Level:
Current Aviation Color Code: YELLOW

Previous Level of Concern Color Code: GREEN

Beginning on January 17, the AVO seismic network detected a distinct, but brief increase in seismicity at Korovin Volcano on Atka Island. Similar periods of elevated seismicity occurred on January 18, 21 and again this morning. One event recorded at 06:35-06:46 AKST (15:35-15:46 UTC), January 22, was sustained for a period of 11 minutes. The elevated seismicity at Korovin indicates that the volcano may be entering a period of unrest and AVO is raising the level of concern color code for Korovin Volcano from Green to YELLOW.

The type of seismic activity we have observed may indicate that low-level volcanic activity is occurring or will soon occur. Clear satellite images yesterday and up until 06:00 AKST this morning however, do not show any unusual activity. Clouds obscure views of the volcano at this time. Previous eruptive activity at Korovin in 2005 was characterized by low-level ash and steam emissions (less than 10,000 feet above sea level).

AVO is monitoring the situation closely and will provide information should activity increase.

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, and 2005. 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.


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 16, 2014 09:40
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