ALASKA VOLCANO OBSERVATORY WEEKLY UPDATEFriday, July 3, 2009 01:06 PM (Friday, July 3, 2009 21:06 UTC)
REDOUBT VOLCANO (CAVW #1103-03-)
60°29'7" N 152°44'38" W, Summit Elevation 10197 ft (3108 m)
Current Aviation Color Code: YELLOW
Current Volcano Alert Level: ADVISORY
Continued low seismicity, reduced gas emissions, and lack of observable growth in the lava dome suggest that the 2009 eruption of Redoubt may be drawing to a close. Due to this consistent trend in the data, AVO lowered Redoubt's Aviation Color Code from Orange to Yellow, and the Alert Level from Watch to Advisory on Tuesday, June 30. The 1 km-long lava dome at the summit, however, remains potentially unstable. Collapse of the lava dome would likely result in high-level ash production, hot lava block and ash flows, and possible flooding in the Drift River valley.
Web camera views, when clear, show continued steaming at the summit.
AVO scientists conducted field work at Redoubt this week, including measuring gas emissions from the steam and gas plume, observing the lava dome, collecting thermal imagery of the dome, and maintaining field equipment.
AVO will continue to monitor Redoubt's activity closely, but will begin to transition off of 24/7 staffing.
CLEVELAND VOLCANO (CAVW #1101-24-)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Aviation Color Code: YELLOW
Current Volcano Alert Level: ADVISORY
AVO has received no reports of activity at Cleveland since the small eruption on June 25. Recent satellite and web camera views of the volcano have been obscured by clouds.
OTHER ALASKA VOLCANOES
Seismic 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-Peulik, Ukinrek Maars, 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
Jessica Larsen, Acting Coordinating Scientist, UAF
faust@gi.alaska.edu (907) 322-4085
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.
