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U.S. Geological Survey
Monday, October 31, 2011, 12:12 PM AKDT (Monday, October 31, 2011, 20:12 UTC)

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 satellite views of Cleveland volcano over the past 24 hours. AVO has received no reports of activity since October 23, when a TerraSAR-X satellite radar image showed surface deflation or collapse of the surface of the lava dome that resides in the summit crater. Such features are consistent with a pause in eruption of lava, but we are unable to confirm if this has continued past October 23.

Effusion of lava may resume at any time. This could result in lava overtopping the crater rim and flowing down the flank of the volcano. Portions of this lava flow could collapse and produce avalanches of hot debris that reach the sea accompanied by small ash clouds. A sudden explosion and ash cloud exceeding 20,000 ft above sea level could also occur. Such explosions could go undetected in satellite imagery for hours. However, in cooperation with the University of Washington, AVO has implemented a lightning alarm system that may detect significant ash-producing events within minutes of onset. In the event of a large ash explosion, seismic signals may be recorded on AVO seismic networks at nearby volcanoes; there is no real-time seismic network on Cleveland.

Additional information on Cleveland volcano and the current activity may be found at this link:


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

Steve McNutt, Coordinating Scientist, UAF
steve@giseis.alaska.edu (907) 474-7131

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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