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ARCHIVED REPORT
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Alaska Volcanoes Update

Friday, February 14, 1997, 2:30 PM AST (2330 UTC)



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

CURRENT LEVEL OF CONCERN CODE IS YELLOW



The eruptive pause at Pavlof Volcano is now beginning its seventh

week. AVO seismometers continue to record very low levels

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

this week.



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

A small eruption began on the morning of February 13 from a cone within

Okmok caldera. First sign of unrest was observed as a hot

spot on early morning satellite images at 5:00 and 10:30 am

AST. Observers 10 miles east of the volcano at the former Fort

Glenn military base reported seeing a dark ash plume at about

10 am AST rise above the caldera rim to an altitude of about 5,000

feet ASL where prevailing winds carried it to the southwest. Since

the volcano is not monitored seismically and no observations

have been reported today from this remote volcano, the state of

the eruption is unknown. The volcano is currently obscured by

clouds.



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 continued during the past week at an average rate of about

2 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].

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Page modified: May 27, 2014 10:23
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