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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

CURRENT STATUS REPORT

Sunday, February 20, 2005 3:35 PM AST (February 21, 0035 UTC)



ALASKA VOLCANOES WITH ELEVATED COLOR CODES:



MOUNT VENIAMINOF VOLCANO (CAVW #1102-07)

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

Current Level of Concern Color Code: ORANGE



Low-level seismic tremor abruptly returned this morning at approximately

10:50 AST (19:50 UTC) after having ceased abruptly yesterday morning at

02:35 AST (1135 UTC). At about 11:50 AST (2050 UTC) today seismic activity

again dropped in amplitude abruptly, only to return at 15:06 AST (0006

February 21 UTC) at a higher level than in previous days. Strombolian

explosions or steam and ash emissions similar to what we have seen over the

past month can occur at any time. Clouds continue to obscure web camera and

satellite views of the volcano.



At this level of activity, we would not expect ash to rise much more than

13,000 ft (4,000 m) above sea level. These ash bursts could, however, pose

a hazard to people and low flying aircraft in the vicinity of the active

cone. Very light ash falls outside of the summit caldera are also

possible. There are no indications that a larger eruption is imminent.



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



Elevated levels of seismicity continue. No activity was seen in satellite

views or web camera images. There are no indications that an eruption is

imminent.



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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