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ALASKA VOLCANO OBSERVATORY INFORMATION STATEMENT
Saturday, August 9, 2008 4:23 PM AKDT (Sunday, August 10, 2008 0023 UTC)


Kasatochi Volcano
52°10'9" N 175°30'41" W, Summit Elevation 1030 ft (314 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: RED

The intensity of seismic activity associated with the Kasatochi eruption has markedly decreased to the level where AVO's seismic network on nearby Great Sitkin Island (about 40 km (25 mi) to the east) is no longer able to detect activity at Kasatochi volcano. Kasatochi has no seismic network; thus AVO does not have the means to monitor seismicity normally associated with eruptive activity. Some larger events may be seen seismically, but in general AVO will rely on satellite and visual reports to monitor activity.

Given the intensity of eruptive activity over the past several days and large ash clouds observed in satellite images AVO is keeping the aviation color code and alert level at RED/WARNING until it can be determined that eruptive activity has declined.

The recent eruptive activity was sufficiently strong to be recorded at seismic stations on Great Sitkin and elsewhere in the region. This intensity (earthquakes with magnitudes greater than M5) is atypical.


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

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

CONTACT INFORMATION:
Chris Waythomas, Acting Scientist-in-Charge, USGS
chris@usgs.gov, (907)786-7497

Jon Dehn, Acting Coordinating Scientist, UAFGI
dehn@gi.alaska.edu (907) 474-6499



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 16, 2014 09:40
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