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ARCHIVED REPORT
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ALASKA VOLCANOES UPDATE

Friday, January 28, 2000 2:00 PM ADT

(2300 UT)

Shishaldin Volcano:

54�45.33�N 163�58.00�W Summit

Elevation 9,373 ft (2,857 m)

LEVEL OF CONCERN COLOR CODE

IS GREEN

The small explosions described in the

January 21, 2000, update are

continuing at a similar rate. These

events are presumably phreatic

(caused by the flashing of water

to steam) and may represent a

local hazard within a few hundred

meters of the vent, but do not

pose a hazard to aircraft. The

occurrence of these events does

not suggest that the likelihood of a

large explosive eruption has

increased. Therefore, we are

staying at Color Code GREEN.

AVO is monitoring the situation closely

and will issue further updates as

the situation warrants.

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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