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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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SPURR



Seismic activity beneath Mt. Spurr is low. An increase in seismicity for several hours on June 29 resulted from a sub-glacial outburst flood from the Kidazgeni Glacier on the southeast flank of Crater Peak. An AVO field crew at the volcano that morning observed ice blocks and a high-volume, turbid flow of water in the stream below the glacier. Subsequent analysis of the seismic data indicated that activity was higher for several hours later, and was probably related to material sloughing off the stream banks. Activity has now returned to normal. The current level of concern color code is GREEN.

Steam and ash explosions could still occur at Crater Peak with little if any advance warning. Such explosions are unlikely to pose a hazard to high-flying aircraft or to communities downwind. AVO continues to recommend that climbers, hikers, and other interested parties stay of the crater until further notice.



OTHER COOK INLET VOLCANOES



Seismicity at Augustine, Redoubt, and Iliamna volcanoes remains at normal levels.

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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URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: May 27, 2014 10:23
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