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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

Current Status Report

Sunday, February 18, 2007 12:20 PM AKST (2120 UTC)




KOROVIN VOLCANO (ATKA ISLAND) (CAVW#1101-16)

52°22'48" N174°9'22" W, Summit Elevation 5030 ft (1533 m)

Current Aviation Color Code: YELLOW

Current Volcanic Activity Alert Level: Advisory



Slightly elevated seismicity continues at Korovin. Satellite views were mostly cloudy today.



Korovin has erupted several times in the past 200 years, most recently in 1998. Eruptions typically produce minor amounts of ash and occasional, small lava flows. Ash plume heights could exceed 20,000 ft above sea level. Korovin occasionally produces large steam plumes from its summit.



VENIAMINOF VOLCANO (CAVW#1102-07-)

56°11'41" N159°23'24" W, Summit Elevation 8225 ft (2507 m)

Current Aviation Color Code: YELLOW

Current Volcanic Activity Alert Level: Advisory



Webcam views and satellite views were cloudy today.



Short-lived, very small-volume steam and ash bursts from the intracaldera cone have been common over the past few years. Ash from these events is not likely to extend beyond the caldera rim. There are no indications that a larger eruption is imminent.



CLEVELAND VOLCANO (CAVW#1101-24-)

52°49'20" N169°56'42" W, Summit Elevation 5676 ft (1730 m)

Current Aviation Color Code: YELLOW

Current Volcanic Activity Alert Level: Advisory



Satellite views were cloudy again today. We have no new information about unrest at Cleveland.



The lack of a real-time seismic network at Cleveland means that AVO is unable to track local earthquake activity related to volcanic unrest. Short-lived explosions with ash plumes that could exceed 20,000 ft above sea level can occur without warning and may go undetected on satellite imagery.



FOURPEAKED VOLCANO (CAVW#1102-26-)

58°46'9" N153°40'26" W, Summit Elevation 6903 ft (2104 m)

Current Aviation Color Code: YELLOW

Current Volcanic Activity Alert Level: Advisory



Low-level seismic unrest continues at Fourpeaked. Webcam and satellite views were cloudy today.



The age of the last significant eruption at Fourpeaked is not known. Because geological investigations have been limited and ice covers much of the area, the sizes and styles of past eruptions are not well-constrained. However, the composition of the volcano indicates that eruptions can be explosive, possibly producing plumes that reach in excess of 33,000 ft above sea level and local ashfall.



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



Steve McNutt, Coordinating Scientist, USGS/GI

steve@giseis.alaska.edu (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.
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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