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Archived Report
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ALASKA VOLCANO OBSERVATORY

CURRENT STATUS REPORT

Saturday July 31, 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



Elevated levels of seismicity continue to be recorded beneath the summit of

Mount Spurr volcano. The seismicity rate has remained unchanged throughout

the week. There are no indications that an eruption is imminent. Often this

type of seismicity will decline without producing an eruption.



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



Tremor bursts and episodes of sustained tremor were recorded throughout the

day at Mount Veniaminof volcano. Based on previous observations, some of

these episodes likely represent ash/steam emissions rising to less than

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 and web

camera views today. 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 tremor continues to be recorded at Shishaldin Volcano.

Activity has changed little over the past several months. A clear

satellite view of the volcano's summit revealed no unusual activity. An AVO

field party working at Shishaldin observed sustained steaming at the

summit, but no sign of any ash being emitted. 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



Steve McNutt, Acting Coordinating Scientist, UAF-GI

steve@giseis.alaska.edu (907) 474-7131



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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