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ARCHIVED REPORT
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ALASKA VOLCANO OBSERVATORY

INFORMATION RELEASE

Thursday, August 12, 2004 11:40 AM ADT (1940 UTC)



MOUNT SPURR VOLCANO (CAVW#1103-04)

61 deg 18' N 152 deg 15' W, Summit Elevation 11,070 ft (3,374 m)

Current Level of Concern Color Code: YELLOW



AVO received a pilot report at approximately 8:15 AM ADT, today, August 12,

2004, of possible emission of ash from Mt. Spurr volcano. At this time we

have no evidence that an eruption has occurred or is in progress. Crater

Peak, the vent responsible for the eruptions in 1953 and in the early

1990s, also shows no sign of any unusual activity.



Earthquake activity continues beneath Mt. Spurr with no significant change

over the past several weeks.



Based on these observations and our continuing seismic monitoring of the

volcano, there are no signs that an eruption is imminent or even certain.

Ephemeral summit craters have been described before at Mt. Spurr and

temporary increases in earthquake activity below a volcano often decline

without producing an eruption. AVO will continue to monitor activity at

Mount Spurr closely using seismic data, satellite images, and overflights,

and will issue further information releases as appropriate.





The volcano-hazard assessment for Mount Spurr Volcano is available from the

AVO web site: http://www.avo.alaska.edu/avo4/products/hazard.htm





ABBREVIATED COLOR CODE KEY (contact AVO for complete description):

GREEN` volcano is dormant; normal seismicity and fumarolic activity

occurring

YELLOW volcano is restless; eruption may occur

ORANGE volcano is in eruption or eruption may occur at any time

RED significant eruption is occurring or explosive eruption

expected at any time





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].

PDF version of these definitions
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URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: May 27, 2014 10:23
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