Printer friendly versionALASKA VOLCANO OBSERVATORY
Monday, October 10, 2005 1:30 PM AKDT (2130 UTC)
52.8232°N 169.9431°W, Summit Elevation 5676 ft (1730 m)
Current Level of Concern Color Code: YELLOW
Previous Level of Concern Color Code: ORANGE
Over the past three days, there have been no new observations of eruptive activity at Cleveland volcano from satellite data, pilots, or ground-based observers. Thus, the Level of Concern Color Code is being reduced to Yellow
. No ash clouds have been detected since last Friday (October 7) when a small eruption produced an ash cloud that reached a height of less than 15,000 ft above sea level.
Cleveland volcano continues to be at an elevated level of unrest. The current activity consists of minor ash emissions that typically produce only a localized ash fall, and small debris flows produced by melting of snow near the summit crater. 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, pilot and ground-based observer reports.
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
Dave Schneider, Acting 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.