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Archived Report
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ALASKA VOLCANO OBSERVATORY


Information Release


Friday, October 5, 2007 11:30 AM AKDT (1930 UTC)




PAVLOF VOLCANO (CAVW#1102-03-)

55°24'57" N161°53'24" W, Summit Elevation 8261 ft (2518 m)

Current Aviation Color Code: GREEN

Current Volcano Alert Level: Normal



The current eruption at Pavlof ended on September 13 and no lava or ash emission has occurred since that time. AVO is lowering the aviation color code and volcano alert level to GREEN and NORMAL.



Seismicity is at background levels. Satellite images and web camera views of the volcano show no evidence of continuing ash or lava emission.



Rockfalls and small avalanches of debris on the southeast flank of the volcano may continue intermittently. Drainages leading away from the south flank of Pavlof are susceptible to small lahars or mudflows as long as hot material remains high on the slopes of the volcano where it could mix with ice and snow.



Pavlof has, in past eruptions, resumed eruptive activity after pauses as long as 55 days, and AVO continues to monitor the volcano closely for signs of renewed activity. We expect hours to days of increased seismicity prior to a return to eruption. See www.avo.alaska.edu for the most up to date information on Pavlof and other Alaskan volcanoes.



Pavlof volcano is located on the southwestern end of the Alaska Peninsula. Pavlof is a stratovolcano which rises to an elevation of 8262 feet. With almost 40 historic eruptions, it is one of the most consistently active volcanos in the Aleutian arc. Eruptive activity is generally characterized by sporadic strombolian fountaining continuing for a several-month period.



VOLCANO ALERT LEVELS:

NORMAL Typical background activity of a volcano in a non-eruptive state

ADVISORY Elevated unrest above known background activity

WATCH Volcano is exhibiting heightened or escalating unrest with increased potential for eruptive activity

WARNING Highly hazardous eruption underway or imminent



ABBREVIATED AVIATION COLOR CODE KEY:

GREEN volcano is dormant; normal seismicity and fumarolic activity occurring

YELLOW volcano is restless; eruption may occur

ORANGE volcano is in eruption or eruption may occur at any time

RED significant eruption is occurring or explosive eruption expected at any time



Please see http://volcanoes.usgs.gov/2006/vhpalertlevel.pdf for a complete description of alert levels and color codes.



VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu

RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478



CONTACT INFORMATION:

Tom Murray Scientist-in-Charge, USGS

tlmurray@usgs.gov (907) 786-7497



Steve McNutt, Coordinating Scientist, UAF

steve@giseis.alaska.edu (907) 474-7131



The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.



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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