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AVO VOLCANO ACTIVITY NOTIFICATION

ALASKA VOLCANO OBSERVATORY WEEKLY UPDATE
U.S. Geological Survey
Friday, September 2, 2011, 12:10 PM AKDT (Friday, September 2, 2011, 20:10 UTC)


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

Clouds have obscured the summit of Mt. Cleveland over the past 24 hours and AVO has received no new information about unrest at the volcano. Because of the extensive cloud cover, we do not know if the M6.8 Fox Islands earthquake that occurred at 2:55 AM AKDT, September 2 had any effect on the unrest at Mt. Cleveland. Earlier this week, AVO lowered the Aviation Color Code/Volcano Alert Level to Yellow/Advisory based on satellite data indicating no significant change in the size of the lava dome in the summit crater. Although the dome-producing eruption at Mt. Cleveland appears to have stopped or paused, it remains possible for dome growth to resume at any time. If growth of the lava dome does resume, it is possible, but not certain, that explosive ash-producing activity may follow.

Without a real-time seismic network on the volcano, AVO is unable to track local earthquake activity related to volcanic unrest, provide forecasts of eruptive activity, or confirmation of explosive, ash-producing events. AVO will continue to monitor the volcano using satellite data as it becomes available.


Cleveland volcano forms the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. It is located about 75 km (45 mi.) west of the community of Nikolski, and 1500 km (940 mi.) southwest of Anchorage. The volcano's most recent significant eruption began in February, 2001 and it produced 3 explosive events that produced ash clouds as high as 12 km (39,000 ft) above sea level. The 2001 eruption also produced a rubbly lava flow and hot avalanche that reached the sea. The most recent minor ash emissions were observed in January and June 2009.



CONTACT INFORMATION:

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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