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ARCHIVED REPORT
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PAVLOF VOLCANO



LEVEL OF CONCERN COLOR CODE: YELLOW

LAST LEVEL OF CONCERN: ORANGE



Seismicity at Pavlof volcano has declined sharply last evening and the eruptive phase that began on December 26 appears to be over. Reports from pilots and ground observers in Cold Bay this morning also indicate no eruptive activity at the volcano. AVO has therefore downgraded the Level of Concern Color Code to YELLOW. The history of Pavlof volcano, however, suggests that further eruptive phases can be expected in the near future, perhaps with little or no warning. AVO will continue to monitor the volcano and issue updates as necessary.



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 are 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
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Page modified: May 27, 2014 10:23
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