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ARCHIVED REPORT
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PAVLOF VOLCANO



LEVEL OF CONCERN COLOR CODE: ORANGE

LAST LEVEL OF CONCERN: ORANGE



Seismic and satellite information indicates that the volcanic eruption continues at Pavlof Volcano 60 km (37 mi) northeast of Cold Bay near the tip of the Alaska Peninsula. Several periods of increased seismicity during the past 24 hours indicate that the eruption is episodic in character with ejection of incandescent material to elevations of probably less than 10,000 feet above sea level. Intermittent low level ash clouds were detected on satellite imagery during the past 24 hours. Weather is poor and inhibits visual observations.



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 an initial strong explosive event that can send an ash plume 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; this part of the eruption typically consists of rhythmic ejection of incandescent bombs and ash to heights of 200-300 m above the cone. Spatter-fed lava flows emanate from the summit vent on occasion.



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 could be expected in the

Cathedral River valley north of the volcano. Airborne ash

hazards to aircraft may be considerable if a large

explosive event occurs but much less severe during a

typical Strombolian phase.



AVO has a seismic network of six stations near the volcano

and will continue to monitor the volcano's seismic

activity.

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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URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: May 27, 2014 10:23
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