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ARCHIVED REPORT
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Alaska Volcanoes Update

Friday, June 6, 1997, 11:00 AM ADT (1900 UTC)



Pavlof Volcano: 55o25' N, 161o54' W; summit elevation 2,518 m (8,262 feet)

LEVEL OF CONCERN COLOR CODE: YELLOW



The slight increase in the level of seismicity that began on Sunday,

June 2, continued through the week at Pavlof Volcano. On

Monday, National Weather Service observers at Cold Bay

reported seeing a steam plume 3,000 ft above the summit of the

volcano. On Tuesday, satellite images recorded a moderate

thermal anomaly at Pavlof. Since then, AVO has received no further

reports of unusual activity at Pavlof and clouds have obscured

the volcano for the remainder of the week. Based on the recent

eruptive activity at Pavlof (September - December, 1996),

renewed activity at this time could be expected. AVO has a seismic

network of six stations near the volcano; this network is monitored

by a computerized alarm system.



Pavlof Volcano, perhaps the most active volcano in the Aleutian volcanic arc,

has a history of 3-8 year-long periods of repose between eruptions. A new

eruption is then marked by a period of strong explosive events

that can send ash plumes to over 10 km (33,000 feet) above sea

level. The eruptive phase then changes to sporadic strombolian

eruption of lava spatter and small amounts of ash that may last

several months. Spatter-fed lava flows emanate from the summit

vent on occasion. The eruption then typically has a quiet period of

several months followed by renewed strombolian activity.

Pavlof was most recently active from September 13 to late December of 1996.



The nearest towns to the volcano are Cold Bay (37 mi), King Cove (30

mi), Sand Point (60 mi), and Nelson Lagoon (50 mi); these towns could expect light ash fall

depending on wind direction and continuing eruptive activity.

Mudflows and some flooding in the Cathedral River valley north of

the volcano may occur. Airborne ash hazards to aircraft may be

considerable if a large explosive event occurs but are much less

severe during a typical Strombolian phase.



Shishaldin Volcano: 54o45'N, 163o58'W; summit elevation 2857 m (9,373 ft)

On Monday, June 2, NWS observers in Cold Bay reported a possible

small steam and ash plume rising 1000 - 1500 ft above the summit

of Shishaldin and drifting about 5 miles downwind to the north. This

volcano is not seismically monitored but has frequent small

eruptions. AVO has received no additional reports of activity at

Shishaldin 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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