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AVO/USGS Volcanic Activity Notice

Volcano: Kasatochi (CAVW #1101-13-)

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

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

Issued: Saturday, August 9, 2008, 10:04 PM AKDT (20080810/0604Z)
Source: Alaska Volcano Observatory
Notice Number: 2008/A25
Location: N 52 deg 10 min W 175 deg 30 min
Elevation: 1030 ft (314 m)
Area: Aleutians Alaska

Volcanic Activity Summary: The intense seismic activity associated with the Kasatochi eruption has declined and is no longer detected on the AVO seismic network on nearby Great Sitkin Island (about 40 km (25 mi) to the east). Vigorous ash emissions (up to 35,000 feet) have not been observed in satellite data for about 36 hours and AVO has received no pilot reports of ash clouds. Passing mariners report nothing unusual and no obvious indications that an explosive eruption is in progress. It appears that explosive eruptive activity has waned and AVO is lowering the aviation color code and alert level to ORANGE/WATCH.

Remarks: Because Kasatochi lacks a seismic network, it may be difficult to determine if or when ash emissions may resume and the volcano remains in a hazardous state. It is possible for explosive activity to resume with little or no warning.

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

Jon Dehn, Acting Coordinating Scientist, UAFGI
dehn@gi.alaska.edu (907) 474-6499

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:(20080810/0604Z)
(3) Volcano:Kasatochi (CAVW# 1101-13-)
(4) Current Color Code:ORANGE
(5) Previous Color Code:red
(6) Source:Alaska Volcano Observatory
(7) Notice Number:2008/A25
(8) Volcano Location:N 52 deg 10 min W 175 deg 30 min
(9) Area:Aleutians Alaska
(10) Summit Elevation:1030 ft (314 m)
(11) Volcanic Activity Summary:The intense seismic activity associated with the Kasatochi eruption has declined and is no longer detected on the AVO seismic network on nearby Great Sitkin Island (about 40 km (25 mi) to the east). Vigorous ash emissions (up to 35,000 feet) have not been observed in satellite data for about 36 hours and AVO has received no pilot reports of ash clouds. Passing mariners report nothing unusual and no obvious indications that an explosive eruption is in progress. It appears that explosive eruptive activity has waned and AVO is lowering the aviation color code and alert level to ORANGE/WATCH.

(12) Volcanic cloud height:Unknown
(13) Other volcanic cloud information:Unknown
(14) Remarks:Because Kasatochi lacks a seismic network, it may be difficult to determine if or when ash emissions may resume and the volcano remains in a hazardous state. It is possible for explosive activity to resume with little or no warning.
(15) Contacts:Chris Waythomas, Acting Scientist-in-Charge, USGS
chris@usgs.gov, (907)786-7497

Jon Dehn, Acting Coordinating Scientist, UAFGI
dehn@gi.alaska.edu (907) 474-6499

(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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Page modified: May 16, 2014 09:40
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