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ARCHIVED REPORT
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Alaska Volcanoes Update

Friday, January 24, 1997, 12:00 noon AST (2100 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 fourth week.

AVO seismometers continue to record very low levels of seismicity

at the volcano. Although the weather has prevented any

ground observations from Cold Bay or Nelson Lagoon, pilots saw

no significant eruptive activity during overflights this week. This

morning, a pilot did report weak emission of steam and possibly

minor ash rising to an estimated 14,000 feet, mixing with a cloud

layer, and drifting southeast. 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 less

than one earthquake per day, a significant reduction from last

week's rate of 11 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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Page modified: May 27, 2014 10:23
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