Printer friendly versionALASKA VOLCANO OBSERVATORY
Saturday, August 27, 2005 11:20 AM AKDT (19:20 UTC)
CLEVELAND VOLCANO (CAVW #1101-24)
52°49’N 169°57’W, Summit Elevation 5,674 ft (1,730 m)
Previous Level of Concern Color Code: Yellow
Current Level of Concern Color Code: Not Assigned
(Note: Cleveland volcano does not have a real-time seismic network; volcanoes without seismic networks are not assigned a color code of Green because without the seismic data, AVO has no definitive information that the level of activity of the volcano is at background)
AVO is lowering the color code for Cleveland volcano from Yellow to "Not Assigned". The last evidence of activity at Cleveland was a thermal feature seen in a satellite image August 11. Since then AVO has had several good satellite views of the volcano, but no evidence of further activity has been seen. Also, we have not received any pilot reports of activity. AVO moved Cleveland to color code Yellow on July 7 when satellite images showed increased heat flow, thin ash deposits, and possible debris flows extending down the volcano’s flanks.
Cleveland volcano forms the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. It is located about 75 km (45 mi) west of the community of Nikolski, and 1500 km (940 mi) southwest of Anchorage. Historical eruptions at Cleveland volcano have been characterized by short-lived explosive bursts of ash, at times accompanied by lava fountaining, lava flows, and debris flows down the flanks. In February, 2001, Cleveland had 3 explosive events that produced ash clouds as high as 12 km (39,000 ft) above sea level. That eruption also produced a rubbly lava flow and hot avalanche that reached the sea.
ABBREVIATED COLOR CODE KEY (contact AVO for complete description):
GREEN volcano is dormant; normal seismicity and fumarolic activity occurring
YELLOW volcano is restless; eruption may occur
ORANGE volcano is in eruption or eruption may occur at any time
RED significant eruption is occurring or explosive eruption expected at any time
VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu
RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478
Tom Murray, Scientist-in-Charge, USGS
firstname.lastname@example.org (907) 786-7497
Steve McNutt, Acting-Coordinating Scientist, UAF-GI
email@example.com (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.