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AVO VOLCANO ACTIVITY NOTIFICATION

ALASKA VOLCANO OBSERVATORY WEEKLY UPDATE
U.S. Geological Survey
Friday, August 22, 2008, 12:11 PM AKDT (Friday, August 22, 2008, 20:11 UTC)


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

Volcanic unrest continues at Okmok Volcano. Satellite data from Monday, August 18, indicated intermittent small ash emissions which drifted generally to the south and reached no higher than 10,000 to 15,000 feet. Beginning Tuesday, August 19, the level of seismic activity approached pre-eruption levels and satellite data showed that ash was no longer being emitted. Despite mostly cloudy conditions on Thursday, August 21, satellite observations show a possible thermal anomaly at the volcano. Seismic activity stayed near pre-eruption levels the remainder of the week.

Although the level of seismicity has declined and it appears that ash is no longer being erupted, it is possible for vigorous ash emissions to resume at any time.

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

Seismic activity at Kasatochi continues. Earthquakes were detected by the AVO seismic network on Great Sitkin Island 25 miles west of Kasatochi all week. Satellite views the majority of the week were obscured by clouds. On Sunday, August 17, people on Adak reported smelling sulfur and on Monday, August 18, clear satellite views showed a steam plume from the volcano's summit.


The volcano remains in a restless condition and is still considered hazardous to approach. Further explosive eruptive activity remains possible.

CLEVELAND VOLCANO (VNUM #311240)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Clouds have obscured the volcano in satellite views most of the week. Partly cloudy satellite views on Tuesday, August 19 showed a weak thermal anomaly at Cleveland volcano and no plume was observed. AVO has received no additional information about activity at Cleveland this week.

Small ash bursts and low-level ash plumes may resume at the volcano. It is also possible for larger, higher reaching plumes to be produced without warning.

OTHER ALASKA VOLCANOES

Seismic activity is monitored in real time at 30 volcanoes in Alaska. Satellite images of all Alaskan volcanoes are analyzed daily for evidence of ash plumes and elevated surface temperatures. Some volcanoes may currently display anomalous behavior but are not considered to be at a dangerous level of unrest. Augustine, Iliamna, Redoubt, Wrangell, Gareloi, Great Sitkin, Makushin, Fisher, Shishaldin, Isanotski, Pavlof, Veniaminof, Ugashik-Peulik, Griggs, Snowy, Fourpeaked, Aniakchak, Tanaga, Kanaga, Akutan, Westdahl, Dutton, Ukinrek Maars, Martin, Mageik, Trident, Katmai, Novarupta, Spurr, and Korovin volcanoes are in color code GREEN and volcano alert level Normal. All are at or near normal levels of background seismicity. AVO did not detect ash plumes or significant elevated surface temperatures in the vicinity of any volcano.

Please see http://www.avo.alaska.edu/color_codes.php for complete definitions of Aviation color codes and Volcano alert levels.

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

Jon Dehn, Acting Coordinating Scientist, UAFGI
dehn@gi.alaska.edu (907) 474-6499



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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