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AVO/USGS Volcanic Activity Notice

Volcano: Okmok (CAVW #1101-29-)

Current Volcano Alert Level: WARNING
Previous Volcano Alert Level: NORMAL

Current Aviation Color Code: RED
Previous Aviation Color Code: GREEN

Issued: Friday, July 25, 2008, 1:47 PM AKDT (20080725/2147Z)
Source: Alaska Volcano Observatory
Notice Number: 2008/A15
Location: N 53 deg 23 min W 168 deg 9 min
Elevation: 3520 ft (1073 m)
Area: Aleutians Alaska

Volcanic Activity Summary: The amplitude of seismic activity has increased in the past hour. Two pilots report ash to 40,000 feet. Satellite data confirm ash to at least 35,000. Based on these observations AVO is increasing the aviation color code at Okmok volcano to RED, and the alert level to WARNING.

Recent Observations:
[Monitoring report] Seismicity accelerated markedly about 12:30 pm today and remains at high levels.
[Other volcanic cloud information] Pilot reports and satellite data suggest ash cloud heights of 35,000 to 40,000 feet. Forecast winds would carry ash generally to the SE.

Hazard Analysis:
[Ash cloud] Pilot reports and satellite data suggest ash cloud heights of 35,000 to 40,000 feet. Forecast winds would carry ash generally to the SE.
[Ash fall] Minor ashfall may occur around the caldera, on the eastern portions of Umnak Island, and to the southeast of the island.
[Pyroclastic flow] The increased intensity of activity suggests that the likelihood of pyroclastic flow activity within the caldera has increased.
[Mud flow] Ongoing eruptions of ash are loading the upper slopes of Okmok Volcano with debris. Rainfall could mix with this ash fall to form mudflows and flooding especially on the eastern flank and eastern drainages from the Okmok caldera rim.

Remarks: Please see http://www.avo.alaska.edu/activity/Okmok.php for more information.

The nearest settlements are Nikolski, population about 35, roughly 45 miles west of the volcano, and a small number of people at the abandoned Fort Glenn military base 10 miles east of the volcano.

Contacts: John Power, Acting Scientist-in-Charge, USGS
jpower@usgs.gov, (907)786-7497

Steve McNutt, Coordinating Scientist, UAFGI
steve@giseis.alaska.edu (907)978-5458

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:(20080725/2147Z)
(3) Volcano:Okmok (CAVW# 1101-29-)
(4) Current Color Code:RED
(5) Previous Color Code:green
(6) Source:Alaska Volcano Observatory
(7) Notice Number:2008/A15
(8) Volcano Location:N 53 deg 23 min W 168 deg 9 min
(9) Area:Aleutians Alaska
(10) Summit Elevation:3520 ft (1073 m)
(11) Volcanic Activity Summary:The amplitude of seismic activity has increased in the past hour. Two pilots report ash to 40,000 feet. Satellite data confirm ash to at least 35,000. Based on these observations AVO is increasing the aviation color code at Okmok volcano to RED, and the alert level to WARNING.
(12) Volcanic cloud height:Unknown
(13) Other volcanic cloud information:Pilot reports and satellite data suggest ash cloud heights of 35,000 to 40,000 feet. Forecast winds would carry ash generally to the SE.
(14) Remarks:Please see http://www.avo.alaska.edu/activity/Okmok.php for more information.

The nearest settlements are Nikolski, population about 35, roughly 45 miles west of the volcano, and a small number of people at the abandoned Fort Glenn military base 10 miles east of the volcano.
(15) Contacts:John Power, Acting Scientist-in-Charge, USGS
jpower@usgs.gov, (907)786-7497

Steve McNutt, Coordinating Scientist, UAFGI
steve@giseis.alaska.edu (907)978-5458
(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].
Contact AVO Privacy Accessibility Information Quality FOIA
URL: avo.alaska.edu/activity/avoreport.php
Page modified: May 16, 2014 09:40
Contact Information: AVO Web Team

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