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Archived Report
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ALASKA VOLCANO OBSERVATORY

INFORMATION RELEASE

Saturday, February 18, 2006 3:05 PM AKST (005 UTC)




AUGUSTINE VOLCANO (CAVW#1103-01-)

59°21'48"N 153°26'W , Summit Elevation 4134 ft (1260 m)

Current Level of Concern Color Code: ORANGE



Activity continues at Augustine Volcano. Rockfall and avalanches from the lava dome continue to be recorded by AVO seismic stations. Scientists from New Mexico Tech are on the island today installing lightning detection equipment.



We have had no additional views of the summit area since yesterday afternoon, when an AVO observation flight documented a new, steaming, blocky lava dome in the summit crater at Augustine. The dome fills much of the crater and extends as a rubbly tongue northward 500-800 m (0.3 0.5 mi) down the upper north flank of the volcano. Dark aprons of collapse debris, including large steaming blocks, extend down slope to the north. This dome is a result of the largely quiet eruption of lava following the cessation of explosive activity on January 30. Some of the lava may have been emplaced prior to January 30. (Please see our web site for photographs: http://www.avo.alaska.edu/volcanoes/volcimage.php?volcname=Augustine)



Earlier this week, satellite views of the volcano showed a thermal anomaly coinciding with the summit area. Airborne gas measurements this week show no significant change from earlier in the eruption. Values of sulfur dioxide emission are broadly consistent with similar types of dome building eruptions at other volcanoes.



A plume composed of variable amounts of gas, steam, and small amounts of ash is likely being emitted intermittently from Augustine's summit. Occasional, very localized ash clouds and light ash fall will be produced by collapses from the lava dome. Evidence of such localized ash fall on the flanks of the volcano was observed from the air this week.



During dome building eruptions, brief, energetic explosions can occur with little or no warning. Such explosions could produce larger amounts of ash leading to the formation of drifting ash clouds that could rise more than 25,000 feet above sea level.



Dome building eruptive activity will likely continue over the next few days or weeks and may continue intermittently over the next several months.



AVO is monitoring the situation 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





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



CONTACT INFORMATION:

Tom Murray, Scientist-in-Charge, USGS

tlmurray@usgs.gov (907) 786-7497



Steve McNutt, Acting Coordinating Scientist, UAF-GI

steve@giseis.alaska.edu (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.
Volcano Alert Levels
NORMAL
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
ADVISORY
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
WATCH
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway but poses limited hazards.
WARNING
Hazardous eruption is imminent, underway, or suspected.
Aviation Color Codes
GREEN
Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.
YELLOW
Volcano is exhibiting signs of elevated unrest above known background level or, after a change from a higher level, volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
ORANGE
Volcano is exhibiting heightened or escalating unrest with increased potential of eruption, timeframe uncertain, OR eruption is underway with no or minor volcanic-ash emissions [ash-plume height specified, if possible].
RED
Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].
PDF version of these definitions
URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: June 11, 2012 11:50
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