Printer friendly versionALASKA VOLCANO OBSERVATORY
Friday, October 7, 2005 10:10 AM AKDT (1810 UTC)
52.8232°N 169.9431°W, Summit Elevation 5676 ft (1730 m)
Current Level of Concern Color Code: ORANGE
The Alaska Volcano Observatory detected a small drifting volcanic ash cloud in satellite data, located approximately 90 miles (150 km) ESE of Dutch Harbor at 1700 UTC. Based on data from a regional seismometer at Nikolski, AVO concludes that the ash came from a small eruption of Mount Cleveland at approximately 01:45 ADT (0945UTC). AVO, in consultation with the National Weather Service, estimates the top of the ash cloud to be no more than 15,000 ft above sea level (4600 m). The level of concern color code for Cleveland is now Orange.
AVO does not operate a seismic network on Cleveland Volcano. 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 (owing to the lack of local 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 significant 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. The most recent minor ash emissions were observed in July 2005.
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.