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Archived Report
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ALASKA VOLCANO OBSERVATORY

CURRENT STATUS REPORT

Wednesday, May 4, 2005 3:45 PM AKDT (23:45 UTC)






ALASKA VOLCANOES WITH ELEVATED COLOR CODES:



MOUNT SPURR VOLCANO (CAVW#1103-04)

6118'N 15215'W, Summit Elevation 11,070 ft. (3,374 m)

Current Level of Concern Color Code: YELLOW



The level of seismic activity remains above background. Clouds obscured views of the volcano by satellite and web camera throughout the day. There are no indications that an eruption is imminent.



A pilot report received yesterday described a debris flow feature below the Spurr summit. AVO staff were able to see this feature from Anchorage using high-powered binoculars prompting an overflight. Despite some cloud cover, AVO staff observed an approximatly 600 meter long debris flow emanating from the ice and snow at about 9500 ft ASL east-southeast of the summit melt pit. This debris flow is similar to those observed in July 2004. Clear views of the melt pit showed that the lake level has decreased since our April 25 overflight. This lake level drop indicates outflow of water from the lake which may have coincided with emplacement of the recent debris flow. Analysis of web camera images suggest that the debris flow occurred late on the morning of

May 2.





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



John Eichelberger, Coordinating Scientist, UAF-GI

eich@gi.alaska.edu (907) 474-5530



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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