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ARCHIVED REPORT
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Alaska Volcanoes Update

Friday, May 23, 1997, 11:00 AM ADT (1830 UTC)



Okmok Volcano: 53.4oN, 168.17oW; 760 m (2,500 ft)

The current eruptive phase at Okmok Volcano, which began February

13, is continuing at a relatively low level. The eruption could intensify

at any time, and lava flows, as well as ash emission, may occur

without warning for a period of weeks to months. Okmok is not

monitored seismically and is not assigned a color code.



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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