Printer friendly versionALASKA VOLCANO OBSERVATORY
Thursday, July 7, 2005 3:55 PM AKDT (23:55 UTC)
CLEVELAND VOLCANO (CAVW #1101-24)
52°49’N 169°57’W, Summit Elevation 5,674 ft (1,730 m)
Current Level of Concern Color Code: YELLOW
Previous Level of Concern Color Code: Not Assigned
Satellite images collected over the past several days have provided additional evidence of increased activity at Cleveland volcano and the Level of Concern Color Code is now assigned at YELLOW. These images show increased heat flow, thin ash deposits, and possible debris flows extending down the volcano’s flanks from the summit crater for ~2 kilometers (~ 6500 ft). Cleveland volcano is not seismically monitored, so satellite images are the primary source of information.
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. Based on this record, it is possible that explosive, ash-producing events could occur at any time and without warning (due to the lack of seismic monitoring). AVO will continue to monitor the volcano using satellite images.
Cleveland volcano forms the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. It is located about about 75 km (45 mi.) west of the community of Nikolski, and 1500 km (940 mi.) southwest of Anchorage. The volcano's most recent eruption began in February, 2001 and had 3 explosive events that produced ash clouds as high as 12 km (39,000 ft) above sea level. This 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
John Eichelberger, Coordinating Scientist, UAF-GI, email@example.com (907) 474-5530
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.