ALASKA VOLCANO OBSERVATORY STATUS REPORT
U.S. Geological Survey
Thursday, September 17, 2009, 12:47 PM AKDT (Thursday, September 17, 2009, 20:47 UTC)

REDOUBT VOLCANO (VNUM #313030)
60°29'7" N 152°44'38" W, Summit Elevation 10197 ft (3108 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

No significant activity has been observed at Redoubt during the past 24 hours. Satellite and web camera views have been obscured by clouds over the past 24 hours. The lava dome in the summit crater remains potentially unstable and could collapse with little or no warning, although as time goes on this becomes less and less likely. A major dome collapse event could result in significant ash production, hot block-and-ash flows, and flooding in the Drift River valley.

Although the operations center is not staffed 24/7, AVO continues to monitor the volcano on a 24/7 basis using an alarm system that alerts on-call staff of potential unrest.

SHISHALDIN VOLCANO (VNUM #311360)
54°45'19" N 163°58'16" W, Summit Elevation 9373 ft (2857 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Seismic activity at Shishaldin remains low. Small air wave signals that could be very minor explosions continue to be recorded by a pressure sensor near the volcano. Satellite and web camera images have been obscured by clouds. AVO has received no additional observations or information about activity at Shishaldin and the likelihood of eruptive activity in the near term is uncertain.



CONTACT INFORMATION:

Tom Murray, Scientist-in-Charge, USGS
tlmurray@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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