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AVO Archived Volcano Activity Notifications

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Archived Report
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SHISHALDIN



There were no reports of activity at Shishaldin this week.



COOK INLET VOLCANOES



Seismic activity beneath Mt. Spurr remains low. The current level of concern 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 out of the crater until further notice.



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



The Alaska Volcano Observatory continues to monitor Spurr, Augustine, Redoubt and Iliamna volcanoes closely. We 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].
PDF version of these definitions
URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: June 11, 2012 11:50
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