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Archived Report
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AKUTAN VOLCANO



LEVEL OF CONCERN COLOR CODE: YELLOW



The rate of seismicity at Akutan Volcano continues to be fewer than 5 recorded earthquakes per day, a significant decrease from the number of earthquakes recorded during the seismic crisis of mid-March. Should earthquake activity continue to decline or remain at this low level over the next week, AVO will downgrade our Level of Concern Color Code to GREEN next Friday.



Data from five seismic stations near Akutan are transmitted in real-time to AVO. AVO ceased around-the-clock staffing last Friday based on the continuing decrease in the number of recorded earthquakes at Akutan. However, AVO continues to closely monitor the volcano using automated computer analysis, and alarm system, and frequent examination of seismic records.



COOK INLET VOLCANOES



Seismic activity at Spurr, Redoubt, Iliamna, and Augustine

volcanoes remains at normal background levels. We

maintain a computerized alarm system 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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