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U.S. Geological Survey
Tuesday, September 15, 2009, 1:23 PM AKDT (Tuesday, September 15, 2009, 21:23 UTC)

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 day. The lava dome in the summit crater remains potentially unstable and could collapse with little or no warning. A major dome collapse event would likely 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.

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

Small explosion signals have been apparent in pressure sensor data over the past 24 hours. However, seismic activity at Shishaldin remains low and there do not appear to be any significant changes in seismicity correlative with the explosion signals. 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.


Tom Murray, Scientist-in-Charge, USGS
tlmurray@usgs.gov (907) 786-7497

Jeff Freymueller, Acting Coordinating Scientist, UAFGI
jeff@giseis.alaska.edu (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.
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Page modified: December 2, 2016 10:12
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