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ARCHIVED REPORT
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Alaska Volcanoes Update

Friday, April 04, 1997, 10:30 AM AST (1930 UTC)



Pavlof Volcano: 55.42N, 161.9W 8,262 ft elevation

CURRENT LEVEL OF CONCERN COLOR CODE IS GREEN



Seismicity at Pavlof has returned to a near-background level after

fourteen weeks of eruptive quiescence. No thermal anomalies

are present on satellite images. Although the likelihood of

renewed activity is still above normal, the immediate hazard

level is low. Pavlof will be removed from the itemized report if

quiescence persists for another week, though AVO will continue to

monitor the volcano closely.



Okmok Volcano: 53.4N, 168.17W; 2,500 ft (760 m)

Visual reports indicate that the eruption, which began February

13, is continuing at relatively low activity level. Satellite images

throughout the week indicate the presence of hot lava flows in the

caldera, and occasional thin, low levelplumes drifting downwind

from the volcano. Plumes have also been reported by aircraft in

the vicinity. Okmok Volcano is not monitored seismically and is not

assigned a color code. Based on past eruptive history, lava flows

and low-level ash emission could continue for weeks to months.

Eruptive activity could intensify at any time.



Okmok is on the eastern end of Umnak Island, 75 miles

southwest of Dutch Harbor. The nearest settlements are Nikolski

(45 miles W) and former Fort Glenn military base (10 miles E).

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].

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