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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

CURRENT STATUS REPORT

Tuesday, January 4, 2005 3:30 PM AST (January 5, 00:30 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



Elevated levels of seismicity continue to be recorded beneath Mount Spurr.

No activity was visible in partly cloudy views of the volcano by satellite

and web camera today. There are no indications that an eruption is

imminent.





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: YELLOW

Previous Level of Concern Color Code: GREEN



Several small ash emissions have been observed coming from the intracaldera

cone of Mount Veniaminof in recent internet camera images from Perryville.

This activity is above what we consider to be normal background. Thus the

color code for Mount Veniaminof has been upgraded to YELLOW.





Ash emission were visible starting around 9:38 AST (18:38 UTC), but could

have been obscured by clouds in previous images. The discrete ash emissions

are small, rising several hundred feet above the cone which has an

elevation of 7,073 ft (2,156 m) above sea level, and dissipating as they

drift towards the east. Ash fall is likely very minor, and confined to the

summit caldera.



Very weak seismic tremor was observed starting on January 1, and has

increased slightly over the past 2 days. The character of the signal

changed to that of numerous discrete events this morning, with events

occurring about once per minute with durations of about 10-20 seconds.

These seismic signals are similar to those recorded during steam emissions

and ash emissions from April to October, 2004. However, there are no

indications from seismic data that events significantly larger than those

observed are imminent. We expect that steam and ash emissions may continue

intermittently and could pose a hazard to people and low-flying aircraft in

the vicinity of the active cone.



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



Ken Dean, Acting Coordinating Scientist, UAF-GI

kdean@gi.alaska.edu (907) 474-7364



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 Geophysics

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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