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U.S. Geological Survey
Saturday, August 9, 2008, 2:23 PM AKDT (Saturday, August 9, 2008, 22:23 UTC)

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 the eruption at Kasatochi has decreased over the past 24 hours. Earthquakes from the Kasatochi area continue to be recorded on the Great Sitkin seismic network, but at a much lower rate than pre-eruptive activity. We do not see seismic signals associated with a vigorous eruption. However, the available seismic stations are too distant to detect low-level ash emissions.

Ash emissions, if they are occurring, have not been observed in satellite data above the low meteorological cloud deck (~20,000 ft asl) over the past 24 hours. Higher meteorological clouds (~30,000 ft asl) have moved into the region over the past 6 hours, further limiting observations of the volcano.
A large mass of drifting ash from the major explosive activity on August 7 continues to be observed in satellite data over the North Pacific. Please see the latest SIGMET warnings for furtter details and forecasts of cloud movement.

Additional explosive activity is possible, and could occur with no warning.

53°23'49" N 168°9'58" W, Summit Elevation 3520 ft (1073 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Eruptive activity continues at Okmok Volcano on Umnak Island in the eastern Aleutian Islands. The intensity of activity has been relatively steady over the past day. A low-level steam and ash plume is seen in satellite data extending towards the south at an estimated altitude of less than 15,000 feet asl. Periods of intense seismicity are not necessarily corresponding with episodes of significant ash production and this has complicated attempts to provide early warning about potential ash cloud hazards based on seismicity alone.

52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: YELLOW

Volcanic unrest at Cleveland Volcano continues, with a thermal anomaly observed in satellite images over the past 24 hours, and is likely the result of the cooling of the newly emplaced lava flows. No ash plumes have been observed in satellite images since July 29. AVO has received no new information about activity at Cleveland Volcano for several days.

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



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.
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Page modified: December 2, 2016 10:12
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