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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

CURRENT STATUS REPORT

Friday August 13, 2004 3:50 PM ADT (23:50 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. Seismicity rates have increased slightly in the past 24 hours.

However, they have not exceeded rates measured in early July. Rates of long

period volcanic earthquakes have increased slightly as well. An aerial

overflight by AVO scientists yesterday indicated no recent eruptive

activity, but steaming was observed from the summit area. There are no

indications that an eruption is imminent, and the seismic activity could

decline without producing an eruption.



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



High winds in the vicinity of Veniaminof have obscured seismic signals over

the past 24 hours, making it difficult to determine the level of activity.

However, it is likely that tremor bursts continue. Clouds obscured the web

camera and satellite data, but low-level steaming and ash emission may be

occurring (less than 10,000 ft above sea level). These emissions could pose

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

Activity at Mount Veniaminof can increase quickly and small ash emissions

may continue to occur with little or no warning.



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. Clouds largely

obscured Shishaldin in satellite data and no activity was observed. 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:



Chris Waythomas, Acting Scientist-in-Charge, USGS

chris@usgs.gov (907) 786-7497



Jeff Freymueller, Acting Coordinating Scientist, UAF-GI

jeff@giseis.alaska.edu; (907) 474-7286





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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Page modified: May 27, 2014 10:23
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