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AVO VOLCANO ACTIVITY NOTIFICATION

ALASKA VOLCANO OBSERVATORY WEEKLY UPDATE
U.S. Geological Survey
Friday, September 5, 2008, 3:54 PM AKDT (Friday, September 5, 2008, 23:54 UTC)


KASATOCHI VOLCANO (VNUM #311130)
52°10'9" N 175°30'41" W, Summit Elevation 1030 ft (314 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Because of declined seismicity and lack of activity in satellite data, AVO lowered the aviation color code from ORANGE to YELLOW and the Alert Level from Watch to Advisory on September 4.

Seismicity at Kasatochi volcano remained low this week. For most of the week, no activity was observed in mostly cloudy satellite views. Today, a weak thermal anomaly was observed at the volcano. On September 3 and 4, passing mariners observed vigorous steam and gas plumes rising above the crater and extending up to twenty miles downwind.


Kasatochi Volcano does not have a seismic network, thus AVO depends on networks on neighboring islands to monitor earthquake activity there. For this reason, low-level seismicity may not be detected. Renewed volcanic activity is possible at any time with little or no warning.



OKMOK VOLCANO (VNUM #311290)
53°23'49" N 168°9'58" W, Summit Elevation 3520 ft (1073 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Seismicity at Okmok volcano remained low this week. Satellite views were obscured by clouds all week and we have no new visual observations. Significant ash plumes have not been observed since August 19.


Although the level of seismicity has declined, it is possible for vigorous ash emissions to resume at any time.

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 and web camera views were most cloudy this week. A weak thermal anomaly was detected on September 4.


AVO monitors Cleveland Volcano with satellite imagery as weather allows. The lack of a real-time seismic network at Cleveland means that AVO is unable to track local earthquake activity related to volcanic unrest. Short-lived explosions of ash that could exceed 20,000 ft above sea level can occur without warning and may go undetected on satellite imagery.



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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