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VOLCANO ACTIVITY NOTIFICATIONS

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(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued: (20170131/0725Z)
(3) Volcano: Bogoslof (VNUM #311300)
(4) Current Color Code: RED
(5) Previous Color Code: ORANGE
(6) Source: Alaska Volcano Observatory
(7) Notice Number: 2017/A82
(8) Volcano Location: N 53 deg 55 min W 168 deg 2 min
(9) Area: Aleutians
(10) Summit Elevation: 492 ft (150 m)
(11) Volcanic Activity Summary: Bursts of explosive activity that began at 5:20 UTC are continuing and intensifying. More than 10 short-duration explosions have been detected in seismic, infrasound and lightning data. Several discrete volcanic clouds have been observed in satellite data. The intensity of these events are increasing, as is the altitude of the volcanic clouds. Thus, AVO is raising the Aviation Color Code to RED and Alert level to Warning for Bogoslof volcano.

Satellite data through 07:00 UTC shows a volcanic cloud with an estimated altitude of 20,000 ft asl moving towards the east. Activity is ongoing and additional explosive events may occur. A status update will be issued as conditions warrant.
(12) Volcanic cloud height: 20,000
(13) Other volcanic cloud information: Moving towards the east
(14) Remarks: Please reference the National Weather Service Alaska Aviation Weather Unit for current information on the volcanic cloud movement. http://aawu.arh.noaa.gov/
(15) Contacts: Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jfreymueller@alaska.edu (907) 322-4085
(16) Next Notice:

AVO/USGS Volcanic Activity Notice

Volcano: Bogoslof (VNUM #311300)

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

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

Issued: Monday, January 30, 2017, 10:25 PM AKST
Source: Alaska Volcano Observatory
Notice Number: 2017/A82
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians

Volcanic Activity Summary: Bursts of explosive activity that began at 5:20 UTC are continuing and intensifying. More than 10 short-duration explosions have been detected in seismic, infrasound and lightning data. Several discrete volcanic clouds have been observed in satellite data. The intensity of these events are increasing, as is the altitude of the volcanic clouds. Thus, AVO is raising the Aviation Color Code to RED and Alert level to Warning for Bogoslof volcano.

Satellite data through 07:00 UTC shows a volcanic cloud with an estimated altitude of 20,000 ft asl moving towards the east. Activity is ongoing and additional explosive events may occur. A status update will be issued as conditions warrant.


Recent Observations:
[Volcanic cloud height] 20,000
[Other volcanic cloud information] Moving towards the east

Remarks: Please reference the National Weather Service Alaska Aviation Weather Unit for current information on the volcanic cloud movement. http://aawu.arh.noaa.gov/

Contacts: Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jfreymueller@alaska.edu (907) 322-4085

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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Page modified: February 17, 2017 10:11
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