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Archived Report
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ALASKA VOLCANO OBSERVATORY

CURRENT STATUS REPORT

Friday July 23, 2004 3:30 PM ADT (23:30 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: YELLOW



Intermittent low-level seismic activity at Mount Veniaminof continues.

Distinct tremor bursts detected on the AVO seismic network likely represent

small ash/steam emissions from the intracaldera cone similar to the one

observed by an AVO field crew on July 22. Based on previous observations,

most such emissions do not reach 10,000 ft. above sea level, though a few

have been reported to reach as high as 12,000 ft. Clouds obscured the

active crater in satellite views today. Occasional web camera images of

the caldera through breaks in the clouds showed steam emanating from the

summit cone. Activity at Mount Veniaminof can increase quickly and small

ash emissions may occur with little or no warning. Such emissions could

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

caldera.





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 seismic activity at Shishaldin Volcano continues. The seismicity

is characterized by weak but continuous tremor that has changed little over

the past several weeks. Clouds covered the volcano today obscuring

satellite views. There are no indications that more vigorous volcanic

activity is imminent. Activity at Shishaldin can, however, increase quickly

and small ash emissions could occur with little or no warning that 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].
PDF version of these definitions
URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: June 11, 2012 11:50
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