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AVO/USGS Volcanic Activity Notice

Volcano: Okmok (CAVW #1101-29-)

Current Volcano Alert Level: WATCH
Previous Volcano Alert Level: WARNING

Current Aviation Color Code: ORANGE
Previous Aviation Color Code: RED

Issued: Saturday, July 26, 2008, 11:01 AM AKDT (20080726/1901Z)
Source: Alaska Volcano Observatory
Notice Number: 2008/A16
Location: N 53 deg 25 min W 168 deg 7 min
Elevation: 3520 ft (1073 m)
Area: Aleutians Alaska

Volcanic Activity Summary: The amplitude and duration of seismic activity has decreased over the last five hours. Satellite data indicate ash is rising to 20,000 to 22,000 feet. Based on these observations AVO is decreasing the aviation color code at Okmok volcano to ORANGE, and the alert level to WATCH.

Recent Observations:
[Monitoring report] Seismicity, both intensity and duration, has declined over the last five hours.
[Other volcanic cloud information] Satellite data suggest ash cloud heights of 20,000 to 22,000 feet. Forecast winds would carry ash generally to the E and SE.

Hazard Analysis:
[Ash cloud] Satellite data suggest ash cloud heights of 20,000 to 22,000 feet. Forecast winds would carry ash generally to the E and SE.
[Ash fall] Minor ashfall may occur around the caldera, on the eastern portions of Umnak Island, and to the southeast of the island.

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.


AVO/USGS Volcanic Activity Notice

Volcano: Okmok (CAVW #1101-29-)

Current Volcano Alert Level: WATCH
Previous Volcano Alert Level: WARNING

Current Aviation Color Code: ORANGE
Previous Aviation Color Code: RED

Issued: Saturday, July 26, 2008, 11:01 AM AKDT (20080726/1901Z)
Source: Alaska Volcano Observatory
Notice Number: 2008/A16
Location: N 53 deg 25 min W 168 deg 7 min
Elevation: 3520 ft (1073 m)
Area: Aleutians Alaska

Volcanic Activity Summary: The amplitude and duration of seismic activity has decreased over the last five hours. Satellite data indicate ash is rising to 20,000 to 22,000 feet. Based on these observations AVO is decreasing the aviation color code at Okmok volcano to ORANGE, and the alert level to WATCH.

Recent Observations:
[Monitoring report] Seismicity, both intensity and duration, has declined over the last five hours.
[Other volcanic cloud information] Satellite data suggest ash cloud heights of 20,000 to 22,000 feet. Forecast winds would carry ash generally to the E and SE.

Hazard Analysis:
[Ash cloud] Satellite data suggest ash cloud heights of 20,000 to 22,000 feet. Forecast winds would carry ash generally to the E and SE.
[Ash fall] Minor ashfall may occur around the caldera, on the eastern portions of Umnak Island, and to the southeast of the island.

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.
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: avo.alaska.edu/activity/avoreport.php
Page modified: May 16, 2014 09:40
Contact Information: AVO Web Team

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