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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Wednesday, September 5, 2012, 2:20 PM AKDT (Wednesday, September 5, 2012, 22:20 UTC)

LITTLE SITKIN VOLCANO (VNUM #311050)
51°57'11" N 178°32'8" E, Summit Elevation 3898 ft (1188 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Elevated seismic activity continues at Little Sitkin. The rate of earthquakes is much reduced from the peak of activity on August 29-30. No eruptive activity has occurred. Clouds and fog have obscured the volcano preventing direct observation by ship, aircraft, or satellite.

AVO is closely monitoring the situation and will issue further updates as conditions change.




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

Satellite views of Cleveland since the last explosion on 20 August show no evidence of further eruptive activity. The last confident satellite detection of fresh lava within the summit crater was in early May.

Based on the apparent hiatus in lava effusion and explosions, it is possible that the current episode of eruptive activity has paused. However,sudden explosions of blocks and ash remain possible with little or no warning. Associated ash clouds could exceed 20,000 feet above sea level.

If a large ash-producing event occurs, nearby seismic, infrasound, or volcanic lightning networks should alert AVO staff quickly. However, for some events, a delay of several hours is possible. There is no real-time seismic monitoring network on Mount Cleveland and AVO is unable to track activity in real time.

ILIAMNA VOLCANO (VNUM #313020)
60°1'55" N 153°5'30" W, Summit Elevation 10016 ft (3053 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Seismicity remains slightly above background.

The current level of activity does not indicate an imminent or certain eruption. Seismic activity, along with gas emissions, appear to be declining gradually. A similar seismic swarm occurred at Iliamna Volcano in 1996-1997 and was not followed by eruptive activity. Prior to an eruption, AVO would expect to see a significant increase in earthquake activity beneath the volcano.


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

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.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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