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Monday, May 31, 2010 12:33 PM AKDT (Monday, May 31, 2010 20:33 UTC)

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

A small ash emission occurred early last night from Cleveland. The cloud was visible in a 7:56 pm ADT May 30 (0356 UTC, May 31) satellite image moving to the southwest and it did not rise above 16,000' ASL. At the time of the satellite image, the cloud was detached, and it is estimated that the emission occurred several hours earlier. The event was a short-lived ash emission and there are no signs of further activity.

The lack of a real-time seismic network at Cleveland means that AVO is unable to track local earthquake activity related to volcanic unrest. Unrest at Cleveland is frequent, and short-lived explosions with ash clouds or plumes that could exceed 20,000 ft above sea level can occur without warning and may go undetected on satellite imagery.

Chris Waythomas, Acting Scientist-in-Charge, USGS (907) 786-7497

Jeff Freymueller, Acting Coordinating Scientist, UAFGI (907) 474-7286

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.