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U.S. Geological Survey
Monday, July 14, 2008, 1:39 PM AKDT (Monday, July 14, 2008, 21:39 UTC)

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

The eruption at Okmok continues based on ongoing seismic activity. Satellite observations indicate ash emissions continue reaching altitudes of 30,000 - 35,000 ft asl. Satellite observations also indicate a thermal anomaly in the western portion of the caldera (in the vicinity of Cone D.). There is currently an NWS ash fall advisory in effect for the Eastern Aleutian zone, including Nikolski and Unalaska/Dutch Harbor.

Okmok Volcano is located on the northeast end of Umnak Island in the eastern Aleutians about 65 miles southwest of Unalaska/Dutch Harbor. The volcano consists of a 6-mile-wide circular caldera or crater about 1600 feet deep that formed about 2000 years ago. Okmok has been frequently active in historical times producing ash clouds often accompanied by lava flows within the caldera. The most recent eruption occurred in 1997 and produced ash clouds and a lava flow that traveled about 5 miles across the caldera floor.

Please see http://www.avo.alaska.edu/activity/Okmok.php for more information.

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

Cleveland was obscured by clouds in satellite and web camera images in the last 24 hours. AVO has received no reports of eruptive activity at the volcano.

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.


John Power, Acting Scientist-in-Charge, USGS
jpower@usgs.gov, (907)786-7497

Steve McNutt, Coordinating Scientist, UAFGI
steve@giseis.alaska.edu (907)978-5458

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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URL: avo.alaska.edu/activity/report.php
Page modified: December 2, 2016 10:12
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