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AVO/USGS Volcanic Activity Notice

Volcano: Pavlof (CAVW #1102-03-)

Current Volcano Alert Level: NORMAL
Previous Volcano Alert Level: ADVISORY

Current Aviation Color Code: GREEN
Previous Aviation Color Code: YELLOW

Issued: Thursday, August 8, 2013, 12:44 PM AKDT (20130808/2044Z)
Source: Alaska Volcano Observatory
Notice Number: 2013/A16
Location: N 55 deg 25 min W 161 deg 53 min
Elevation: 8261 ft (2518 m)
Area: Alaska Peninsula Alaska

Volcanic Activity Summary: Since June 26 2013, no lava or ash emissions have occurred at Pavlof Volcano and the volcano has exhibited gradually declining levels of unrest. Seismicity is now at background levels, and satellite images and web camera views of the volcano show no evidence of continuing lava or ash emission. Consequently, AVO is lowering the Aviation Color Code to GREEN and the Volcano Alert Level to NORMAL.

Rockfalls and small avalanches of debris may occur intermittently on the north-northwest flank of the volcano. Drainages leading away from the north flank of Pavlof are susceptible to small lahars and minor floods 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 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 resumption of eruptive activity.

Remarks: 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. The community of Cold Bay is located 60 km (37 miles) to the southwest of Pavlof.

Contacts:
Chris Waythomas, Acting Scientist-in-Charge, USGS
chris@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.alaska.edu (907) 378-7556

Next Notice: A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at
http://www.avo.alaska.edu

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.


(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:(20130808/2044Z)
(3) Volcano:Pavlof (CAVW# 1102-03-)
(4) Current Color Code:GREEN
(5) Previous Color Code:yellow
(6) Source:Alaska Volcano Observatory
(7) Notice Number:2013/A16
(8) Volcano Location:N 55 deg 25 min W 161 deg 53 min
(9) Area:Alaska Peninsula Alaska
(10) Summit Elevation:8261 ft (2518 m)
(11) Volcanic Activity Summary:Since June 26 2013, no lava or ash emissions have occurred at Pavlof Volcano and the volcano has exhibited gradually declining levels of unrest. Seismicity is now at background levels, and satellite images and web camera views of the volcano show no evidence of continuing lava or ash emission. Consequently, AVO is lowering the Aviation Color Code to GREEN and the Volcano Alert Level to NORMAL.

Rockfalls and small avalanches of debris may occur intermittently on the north-northwest flank of the volcano. Drainages leading away from the north flank of Pavlof are susceptible to small lahars and minor floods 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 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 resumption of eruptive activity.
(12) Volcanic cloud height:Unknown
(13) Other volcanic cloud information:Unknown
(14) Remarks: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. The community of Cold Bay is located 60 km (37 miles) to the southwest of Pavlof.
(15) Contacts:
Chris Waythomas, Acting Scientist-in-Charge, USGS
chris@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.alaska.edu (907) 378-7556

(16) Next Notice:A new VONA will be issued if conditions change significantly or alert levels are modified. While a VONA is in effect, regularly scheduled updates are posted at
http://www.avo.alaska.edu
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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URL: www.avo.alaska.edu/activity/avoreport.php
Page modified: June 17, 2015 15:03
Contact Information: AVO Web Team

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