Printer friendly versionAlaska Volcano ObservatoryWeekly UpdateFriday, January 2, 2009 1:48 PM AKST (22:48 UTC)CLEVELAND VOLCANO (CAVW #1101-24-)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Aviation Color Code:
YELLOWCurrent Volcano Alert Level:
ADVISORYA short-lived but explosive ash emission occurred this morning to about 6 km (20,000 ft) altitude. The plume was first observed in a satellite image obtained at 1645 UTC (7:45 AKST)and was visible in subsequent images for several hours. The plume drifted about 240 km (150 mi) east-southeast, but dispersed rapidly and presently can no longer be detected. Satellite views of the volcano have been obscured by clouds most of the week. A small thermal anomaly was observed on Dec. 28, but has not been seen since. No other reports of activity have been received.
Cleveland is not seismically monitored; satellite data and pilot reports are the primary source of information.
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 October 2006.
REDOUBT VOLCANO (CAVW #1103-03-)
60°29'7" N 152°44'38" W, Summit Elevation 10197 ft (3108 m)
Current Aviation Color Code:
YELLOWCurrent Volcano Alert Level:
ADVISORYSeismic activity at
Redoubt has been at a low level throughout the week. Nothing unusual was observed in clear views of the volcano by satellite this week. A few minor steam plumes in the vicinity of the summit were observed earlier in the week but are not considered unusual.
Heavily ice-mantled Redoubt volcano is located on the western side of Cook Inlet, 170 km (106 mi) southwest of Anchorage and 82 km (51 mi) west of Kenai, within Lake Clark National Park. Redoubt is a stratovolcano which rises to 10,198 feet above sea level. Recent eruptions occurred in 1902, 1966-68, and 1989-90. The 1989-90 eruption produced mudflows, or lahars, that traveled down the Drift River and partially flooded the Drift River Oil Terminal facility. The ash plume produced by the 1989-90 eruption affected international air traffic and resulted in minor or trace amounts of ash in the city of Anchorage and other nearby communities.
OTHER ALASKA VOLCANOESSeismic activity is monitored in real time at 31 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.
Akutan,
Aniakchak,
Augustine,
Dutton,
Fisher,
Fourpeaked,
Gareloi,
Great Sitkin,
Griggs,
Iliamna,
Isanotski,
Kanaga,
Katmai,
Korovin,
Mageik,
Makushin,
Martin,
Novarupta,
Okmok,
Pavlof,
Shishaldin,
Snowy,
Spurr,
Tanaga,
Trident, Ugashik-
Ugashik-Peulik,
Ukinrek Maars,
Veniaminof,
Westdahl, and
Wrangell volcanoes are in color code
GREEN and volcano alert level Normal. 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.
Please see
http://www.avo.alaska.edu/color_codes.php for complete definitions of Aviation color codes and Volcano alert levels.
VOLCANO INFORMATION ON THE INTERNET:
http://www.avo.alaska.edu
/>RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478
CONTACT INFORMATION:
Tom Murray, Scientist-in-Charge, USGS
tlmurray@usgs.gov (907) 786-7497
Jon Dehn, Acting Coordinating Scientist, UAFGI
jdehn@gi.alaska.edu (907) 474-6499
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.
