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ARCHIVED REPORT
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Alaska Volcanoes Update

Friday, February 7, 1997, 10:30 AM AST (1900 UTC)



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

CURRENT LEVEL OF CONCERN CODE IS YELLOW



The eruptive pause at Pavlof Volcano is now beginning its sixth week.

AVO seismometers continue to record very low levels of seismicity

at the volcano. AVO received no pilot reports of activity this

week. On Tuesday, ground observers got a brief glimpse of

the volcano and reported that the summit vent area, which had

been snow covered last week, was bare of snow. Yesterday, the

same observer saw a small steam plume rising from the vent area

several hundred feet up to about the summit level.



Based on comparisons to other historical eruptions at Pavlof, it is

possible that this pause will persist for weeks or months,

followed by resumption of ash and lava emission with little or no

warning. Accordingly, AVO continues to monitor the volcano

closely and will issue further updates as the situation changes.



Iliamna Volcano: 60.04N, 153.17W 10,196 ft elevation

The seismic swarm that began on 1 August 1996 beneath Iliamna

Volcano continued during the past week at an average rate of about

4 earthquakes per day.

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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