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ARCHIVED REPORT
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SHISHALDIN VOLCANO



AVO has received no further reports of eruptive activity at Shishaldin Volcano on Unimak Island in the eastern Aleutians since December 23, when pilots reported an ash plume reaching 35,000 feet above sea level. In the early morning hours of December 24, a Cold Bay resident, 56 mi (90 km) northeast of Shishaldin noted a possible very light ash fall. A satellite image from the approximate time of eruption showed a weak plume that dissipated by midday on December 24. Although there is no monitoring equipment on Shishaldin, AVO will continue to track the status of the volcano through pilot observation and analysis of satellite images.



Shishaldin Volcano is a symmetric stratovolcano with a summit crater that produces a steady, vigorous cloud of steam and, occasionally, small amounts of ash. It is one of the most active volcanoes in the Aleutian volcanic arc, erupting at least 27 times since 1775. Prior to the December 23 event, the most recent eruptive period was in 1986-1987 and consisted of minor steam and ash emission over several months. The nearest village is False Pass, 20 mi (32 km) east-northeast of the volcano.



COOK INLET VOLCANOES



Seismic activity at Spurr, Redoubt, Iliamna, and Augustine

volcanoes remains at normal background levels.



NOTE: Due to the partial shutdown of the Federal

Government, the Alaska Volcano Observatory is currently

operating with reduced staff. However, we continue to

seismically monitor Spurr, Redoubt, Iliamna, and Augustine

volcanoes. A computerized alarm system 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].

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

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