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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

CURRENT STATUS REPORT

Sunday August 22, 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



Increased levels of seismicity continue beneath Mount Spurr volcano.

Seismicity rates have declined just slightly over the past 24 hours, but

remain above background levels. There are no indications that the level of

activity will change drastically and we do not anticipate any kind of

eruptive activity at this time. The Mt. Spurr summit area was observed in

satellite images today, but no activity was observed.



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 have been occurring

over the past 24 hours although the signal has been obscured somewhat by

windy conditions in the vicinity of the volcano. Low-level tremor is likely

associated with minor emissions of volcanic ash, steam, or mixed steam and

ash. Clouds and fog obscured views of the intracaldera cone with the web

camera and in satellite images. Low-level ash emissions could pose a hazard

to people and low flying aircraft in the vicinity of the intracaldera cone.

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 over the past 24 hours.

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 of the area 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



Chris Nye, Acting Coordinating Scientist, UAF-GI

cnye@giseis.alaska.edu; (907) 978-5458





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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