Printer friendly versionALASKA VOLCANO OBSERVATORY
Friday, August 25, 2006 12:25 PM AKDT (2025 UTC)
56°11'44" N159°23'18" W, Summit Elevation 8225 ft (2507 m)
Current Level of Concern Color Code: YELLOW
Seismicity at Veniaminof increased slightly early this week, but overall remains quite low. Satellite and web camera views during brief periods of clear weather this week showed a small, white steam plume and no signs of ash emission.
Intermittent, short-lived, very small-volume steam and ash bursts from the intracaldera cone have been common over the past few years. Ash from these events is not likely to extend beyond the caldera rim. There are no indications that a larger eruption is imminent.
52°49'24" N169°56'35" W, Summit Elevation 5676 ft (1730 m)
Current Level of Concern Color Code: Not Assigned
Just before 8:00 pm on August 24, the National Weather Service (NWS) received a report of an eruption at Mount Cleveland Volcano in the central Aleutians via a brief phone call from a passing ship. NWS and AVO scientists examined satellite images and seismic data from the closest stations (45 miles east of the volcano) and found no evidence of activity. Weather in the region is cloudy again today, but there is no indication of significant eruptive activity in the vicinity of Cleveland. Efforts to track down additional observation details from the ship have failed. Cleveland is not monitored directly with seismometers to detect volcanic earthquakes and explosions.
Frequently active 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 producing 3 explosive events and 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. Short-lived explosions of ash reaching approximately 20,000 feet above sea level were observed on February 6 and May 23, 2006.
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. Wrangell, Spurr, Redoubt, Iliamna, Snowy, Griggs, Katmai, Novarupta, Trident, Mageik, Martin, Peulik, Ukinrek Maars, Aniakchak, Pavlof, Dutton, Isanotski, Shishaldin, Fisher, Westdahl, Akutan, Makushin, Okmok, Korovin, Great Sitkin, Kanaga, Tanaga, and Gareloi volcanoes are in color code GREEN. 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.
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
Tina Neal, Acting Scientist-in-Charge, USGS
email@example.com (907) 786-7497
Steve McNutt, Acting Coordinating Scientist, UAF
firstname.lastname@example.org (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.