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AVO VOLCANO ACTIVITY NOTIFICATION

ALASKA VOLCANO OBSERVATORY STATUS REPORT
U.S. Geological Survey
Monday, August 18, 2008, 1:35 PM AKDT (Monday, August 18, 2008, 21:35 UTC)


KASATOCHI VOLCANO (VNUM #311130)
52°10'9" N 175°30'41" W, Summit Elevation 1030 ft (314 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Seismic activity at Kasatochi continues to be detected by the AVO seismic network on Great Sitkin Island 25 miles to the west. Clouds have obscured the volcano in satellite views. No plumes have been observed, but people on Adak reported smelling sulfur Sunday afternoon.

The volcano remains in a restless condition and is still considered hazardous to approach. Further explosive eruptive activity remains possible.

CLEVELAND VOLCANO (VNUM #311240)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Clouds have obscured the volcano in satellite views. No plumes or other observations of activity have been reported.

AVO monitors Cleveland volcano with satellite imagery as weather allows. 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 of ash that could exceed 20,000 ft above sea level can occur without warning and may go undetected on satellite imagery. Please see http://www.avo.alaska.edu/activity/Cleveland.php for more information.

OKMOK VOLCANO (VNUM #311290)
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. The seismic intensity and tremor duration are still above background levels. Satellite data from the past 12 hours indicates small ash emissions have occurred intermittently and are drifting generally to the south and not reaching higher than 10,000 to 15,000 feet.

Okmok continues to produce ash and mixed ash and steam clouds. Given the level of unrest at the volcano, it remains possible for vigorous ash emissions to occur at any time, and ash plumes higher than 15,000 feet remain a possibility.

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

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

CONTACT INFORMATION:

John Power, Acting Scientist-in-Charge, USGS
jpower@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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