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ARCHIVED REPORT
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Alaska Volcanoes Update

Friday, February 28, 1997, 11:30 AM AST (2030 UTC)



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

CURRENT LEVEL OF CONCERN CODE IS YELLOW



The pause in eruptive activity at Pavlof Volcano is now beginning its ninth

week. AVO seismometers continue to record very low levels

of seismicity at the volcano. NWS observers in Cold Bay saw the

volcano early in the week and observed no visible signs of

volcanic activity. 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.



Pavlof is located 600 miles southwest of Anchorage. The nearest towns to

the volcano are Cold Bay (37 mi SW), King Cove (30 mi SW),

Sand Point (60 mi E), and Nelson Lagoon (50 mi NE). AVO has a

seismic network of six stations near the volcano.



Okmok Volcano: 53.4N, 168.17W; 2,500 ft elevation

The eruption that began the morning of February 13 from a cone on the

south side of the Okmok caldera floor continued throughout the

week with production of incandescent lava accompanied by

intermittent steam and ash plumes that reached as high as

12,000 feet ASL and drifted as far as 60 miles downwind. Residents

living at Fort Glenn reported climbing to the rim of the caldera

and viewing a 1/2 to 3/4 mile-long lava flow from the cone, thus

confirming the satellite imagery analyses showing major hot spots

in the caldera. Satellite imagery analyses and pilot reports verified

ongoing eruptive activity. The volcano is not monitored

seismically. Based on past eruptive history, the current

activity is expected to continue for weeks to months.



Okmok is located 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).



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

The seismic swarm that began on 1 August 1996 beneath Iliamna

Volcano appears to be diminishing. Earthquake count averages

have gradually decreased over the past several weeks. Only 5

located events were recorded this week.

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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Page modified: May 27, 2014 10:23
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