Printer friendly versionALASKA VOLCANO OBSERVATORY
Friday, April 7, 2006 10:10 AM AKDT (1810 UTC)
59°21'48"N 153°26'W , Summit Elevation 4134 ft (1260 m)
Current Level of Concern Color Code: ORANGE
Low-level eruptive activity continues at Augustine Volcano, though at diminished levels compared to previous weeks. Occasional hot block-and-ash flows, rock avalanches, and rock falls originating from the summit lava dome and lava flows continue to be recorded by the seismic network. Small and dilute ash clouds resulting from these processes are likely confined to the immediate vicinity of the volcano. During very high wind conditions, minor amounts of ash may be carried longer distances.
Satellite imagery of the volcano this week indicated a continuing thermal anomaly at Augustine's summit. Airborne sulfur dioxide gas measurements this week show continued emissions of magmatic gas. Low-light camera observations, which are becoming increasingly difficuly to make because of lengthening days, show that activity this week was restricted mainly to the summit dome.
Dome-building eruptive activity will likely continue, perhaps intermittently, over the next several weeks or months. Brief, energetic explosions of ash can occur with little or no warning. Such explosions could produce significant amounts of ash and drifting ash clouds that could rise more than 25,000 feet above sea level.
AVO is monitoring Augustine closely and the observatory remains staffed 24/7. For up-to-date Ashfall Advisories and wind trajectories, please refer to the National Weather Service website: http://pafc.arh.noaa.gov/augustine.php
56°11'44"N 159°23'18"W , Summit Elevation 8225 ft (2507 m)
Current Level of Concern Color Code: YELLOW
Clear web camera views this week have shown low altitude ash emissions. On April 6, a pilot reported an ash plume rising to 10,000 ft ASL. The sesimic network, which had been out since March 21, was repaired on April 5. Seismicity remains at low levels. Production of short-lived, very small-volume steam and ash bursts from the intracaldera cone has been typical of this volcano intermittently over the past few years. There are no indications that a larger eruption is imminent. Ash clouds and fallout from these events are not likely to extend beyond the caldera rim, but could pose a hazard to people and low-flying aircraft in the vicinity of the active cone.
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.