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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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SPURR



Since the last update on January 4, 1993, six earthquakes have been located beneath Crater Peak. One locatable event has occurred in the past 24 hours. Although the volcano has not erupted for 112 days, seismic activity remains above background levels.

The level of concern color code for Mt. Spurr volcano will remain YELLOW for at least another week.



SEGUAM



No reports of activity at Pyre Peak on Seguam Island were received this week.



The Alaska Volcano Observatory continues to monitor Mt. Spurr closely but will no longer be on 24hr duty. This decision reflects the general decrease in seismicity and the significant elapsed time since the last eruption. The Fairbanks office will operate on extended business hours including weekends, and the Anchorage office will be staffed during normal business hours. AVO continues to maintain a computerized alarm system that is capable of notifying AVO seismologists during non-business hours should unusual seismic activity occur.

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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