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AVO VOLCANO ACTIVITY NOTIFICATION

ALASKA VOLCANO OBSERVATORY STATUS REPORT
U.S. Geological Survey
Sunday, May 17, 2009, 1:16 PM AKDT (Sunday, May 17, 2009, 21:16 UTC)


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

The 2009 eruption of Redoubt continues and the summit lava dome continues to grow. Small rock avalanches, discrete earthquakes and minor volcanic tremor have been evident in seismic data over the past 24 hours. The lava dome has been visible in web camera images today and a robust steam plume rising from the southern part of the dome base is present. Rock avalanches have been occurring intermittently and are producing diffuse low level ash plumes that are too small to be detected in radar or satellite data.

AVO scientists who overflew the volcano yesterday report that a steaming, turquoise lake still exists along the south margin of the dome, and a persistent, vigorous fumarole on the west wall of the upper gorge was very active (and hot according to FLIR). No creases, cracks, or other signs of instability, at least to the naked eye are present on the surface of the dome, although the front is quite steep.

If a lava dome collapse occurs, or if the dome is removed by a sudden explosive event, significant ash emissions, possibly >30,000 feet above sea level, and trace to minor ash fall on communities in south-central Alaska could occur. Pyroclastic flows associated with dome collapse or removal also may develop, and they could initiate lahars and floods in the Drift River valley.

AVO is monitoring Redoubt volcano closely and the observatory is staffed 24/7. AVO will provide frequent updates of the volcano's status and the earliest possible warning of significant explosive activity and other hazardous phenomena.


VENIAMINOF VOLCANO (VNUM #312070)
56°11'52" N 159°23'35" W, Summit Elevation 8225 ft (2507 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Seismicity at Veniaminof has been low but above background levels over the past 24 hours. Seismic activity is characterized by short periods of low amplitude volcanic tremor and some discrete earthquakes. No unusual activity has been observed in satellite data today, and AVO has received no reports of unusual activity from from pilots or observers in the area.





VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu

RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478

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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