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Archived Report
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ALASKA VOLCANO OBSERVATORY

CURRENT STATUS REPORT

Saturday August 21, 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 been about 0-3 earthquakes every hour over the past

24 hours. 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. Conditions at the volcano have not changed significantly in the past

several days. Views of the Mt. Spurr summit area were obscured by clouds

and no AVO scientists visited the volcano today.



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 has been occurring over the past 24 hours

although the signal has been obscurred somewhat by sustained high winds in

the vicinity of the volcano. Low-level tremor is likely associated with

minor bursts of volcanic ash, steam, or mixed steam and ash. Clouds

obscured views of the intracaldera cone with the web camera and no activity

was observed in satellite data. 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 intracladera 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



High winds have obscurred the low-level seismic signals recorded at

Shishaldin Volcano today. However, there is no evidence of any increased

activity and activity is most likely the same as in 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:



Thomas 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].
PDF version of these definitions
URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: June 11, 2012 11:50
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