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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

Current Status Report

Sunday, December 17, 2006 12:05 PM AKST (2105 UTC)




FOURPEAKED VOLCANO (CAVW#1102-26-)

58°46'12" N153°40'19" W, Summit Elevation 6903 ft (2104 m)

Current Aviation Color Code: YELLOW

Current Volcanic Activity Alert Level: Advisory



Low-level earthquake and fumarolic activity continue at Fourpeaked volcano. The volcano is obscured by clouds in web camera and satellite views today.



The age of the last 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.



CLEVELAND VOLCANO (CAVW#1101-24-)

52°49'24" N169°56'35" W, Summit Elevation 5676 ft (1730 m)

Current Aviation Color Code: YELLOW

Current Volcanic Activity Alert Level: Advisory



AVO has received no new information about activity at Cleveland. Nothing unusual was observed in mostly clear satellite images over the past 24 hours.



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 ash explosions could occur without warning and may go undetected on satellite imagery.



VENIAMINOF VOLCANO (CAVW#1102-07-)

56°11'44" N159°23'18" W, Summit Elevation 8225 ft (2507 m)

Current Aviation Color Code: YELLOW

Current Volcanic Activity Alert Level: Advisory



Seismicity at Veniaminof remains low but above background. Nothing unusual was observed in mostly clear satellite views this morning. Clear web camera views this morning showed low-level steaming from the intracaldera cone.



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.



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

52°22'52" N174°9'15" W, Summit Elevation 5030 ft (1533 m)

Current Aviation Color Code: YELLOW

Current Volcanic Activity Alert Level: Advisory



Seismicity at Korovin remains above background. Mostly cloudy satellite views today revealed nothing unusual.



Northern Atka Island is home to at least two potentially active volcanic vents. While Korovin is the source of recent steam emission, the current seismicity is located under neighboring Mount Kliuchef. Because seismicity does not always indicate the potential eruptive source vent, AVO will continue to refer to Korovin Volcano unless new data allow us to be more specific.



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.





VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu



RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478



CONTACT INFORMATION:

Game McGimsey, Acting Scientist-in-Charge, USGS

mcgimsey@usgs.gov (907) 786-7497



Mike West, Acting Coordinating Scientist, UAFGI

west@gi.alaska.edu (907) 474-6977



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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