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ARCHIVED REPORT
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Alaska Volcanoes Update

Monday, June 2, 1997 10:00 PM ADT (06:00 UTC)



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

LEVEL OF CONCERN COLOR CODE: YELLOW

LAST LEVEL OF CONCERN: GREEN



Beginning Sunday morning, a low level increase in seismic activity

was detected at Pavlof Volcano. Today at 3:30 pm ADT, the NWS

at Cold Bay reported seeing a steam plume which increased in

vigor and reached a height of 3,000 ft above the summit of the

volcano. Based on the recent eruptive activity at Pavlof (September

- December, 1996) as well as it's history and character,

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

network of six stations near the volcano, which are 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 Sept 13 to end Dec 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)

Visual report from NWS at 3:35 pm ADT, Cold Bay, of a 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.

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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