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Archived Report
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PAVLOF VOLCANO



LEVEL OF CONCERN COLOR CODE: YELLOW

LAST LEVEL OF CONCERN: ORANGE



Seismic activity at Pavlof volcano declined substantially Friday evening, December 13, and has remained near background levels prompting AVO to downgrade the Level of Concern Color Code to YELLOW. The decrease in seismicity implies that lava fountaining and explosions have abated. NWS observers in Cold Bay saw lava fountaining prior to the decrease in seismicity on Friday evening; observers report no visible steam or ash emanating from the volcano on Sunday morning. Typical eruptions of Pavlof are characterized by periods of lava fountaining and associated lava flows (strombolian activity) interspersed with periods of diminished activity. Renewed lava fountaining and production of local diffuse ash clouds could begin again with little seismic warning. This pattern is expected to continue for months to years, similar to the three most recent eruptions of Pavlof exhibited this behavior from 1986-1988, 1980-1983, and 1973-1976. AVO will continue to monitor the volcano closely and issue further updates as the situation warrants.



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

King Cove (30 mi), Sand Point (60 mi), and Nelson Lagoon

(50 mi). If the eruption intensifies, these towns could expect light ash fall depending on wind direction and continuing eruptive activity. Eruptive activity could cause mudflows and some flooding 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.

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
URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: June 11, 2012 11:50
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