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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

CURRENT STATUS REPORT

Tuesday August 31, 2004 3:45 PM ADT (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



Seismic activity beneath Mount Spurr volcano continues to be above

background. Activity has not changed appreciably in the last 24 hours. No

activity was observed in satellite views of the volcano today. There are

no indications that an eruption is imminent. Often this type of seismicity

will decline without producing an eruption.



MOUNT VENIAMINOF VOLCANO (CAVW #1102-07)

5610'N 15923'W, Intracaldera Cone Elevation 7,073 ft (2,156 m)

Current Level of Concern Color Code: YELLOW



Low-level volcanic tremor and occasional tremor bursts continue at Mount

Veniaminof. This activity is likely associated with minor emissions of

volcanic ash, steam, or mixed steam and ash. Clouds and fog obscured views

of the intracaldera cone in web camera and satellite images. Low-level ash

emissions could pose a hazard to people and low flying aircraft in the

vicinity of the caldera. Activity at Mount Veniaminof could increase

quickly and ash bursts above the intracaldera cone may occur with little or

no warning as they have for the past several weeks.



SHISHALDIN VOLCANO (CAVW #1101-36)

5445'N 16358'W, Summit Cone Elevation 9,373 ft (2,857 m)

Current Level of Concern Color Code: YELLOW



Low-level tremor continues at Shishaldin Volcano. There is no evidence of

any increased activity and conditions at the volcano remain the same as

they have been for the past several months. Clouds obscured Shishaldin in

satellite views today. Should activity at Shishaldin increase, ash

emissions could occur with little or no warning and these would pose a

hazard to people and low-flying aircraft in the immediate vicinity of the

summit.



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].

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