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ARCHIVED REPORT
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ALASKA VOLCANOES UPDATE

Friday, February 18, 2000 1:30 PM

AST (2230 UT)

Shishaldin Volcano:

5445.33'N 16358.00'W (CAVW

#1101-36)

Summit Elevation 9,373 ft (2,857 m)

LEVEL OF CONCERN COLOR CODE

IS GREEN

PREVIOUS LEVEL OF CONCERN

COLOR CODE WAS YELLOW

Seismic activity has declined significantly

at Shishaldin volcano.

February 4th marked the last day

that appreciable numbers of

seismic events were detected.

This was also the last day that the

presence of small explosions was

observed. No thermal anomaly

has been observed in satellite

imagery and no pilot or ground

observations of unusual activity

have been reported. The Level of

Concern Color Code has therefore

been changed to GREEN.

Alaska Volcanoes:

No Change.

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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Page modified: May 27, 2014 10:23
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