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ARCHIVED REPORT
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Alaska Volcanoes Update

Friday, May 2, 1997, 10:30 AM ADT (1830 UTC)



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

Eruptive activity at Okmok Volcano is continuing. Hot lava flows within

the caldera as well as thin, lowlevel, ash plumes have been

observed via satellite during the last week. The current eruptive

phase began February 13. Based on past eruptive history, lava

flows and ash emission may continue to occur without additional

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).



Other Volcanoes: (repeated in subsequent updates)

Seismic activity is monitored in real time at the following volcanoes.

Some of the volcanoes listed below may have anomalous

seismicity, as noted, but are not considered to be at a dangerous

level of unrest.



Pavlof, Iliamna, Spurr, Redoubt, Augustine, Griggs, Katmai,

Novarupta, Trident, Mageik, Martin, Dutton, Akutan, and

Makushin volcanoes are all at or near normal levels of background

seismicity.

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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