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(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued: (20170117/1756Z)
(3) Volcano: Bogoslof (VNUM #311300)
(4) Current Color Code: ORANGE
(5) Previous Color Code: ORANGE
(6) Source: Alaska Volcano Observatory
(7) Notice Number: 2017/A22
(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: Increased seismic activity over the past several hours indicates that minor explosive activity is occurring at Bogoslof. The level of activity is variable, with the most energetic events observed around 1500 UTC and 1640 UTC (4:00 and 7:40 am AKST). Minor emissions of steam and minor amounts of volcanic ash observed in satellite data around 1500 and 1730 UTC. These events were too small to generate detectable lightning or infrasound (pressure) signals. The National Weather Service has estimated a maximum altitude for these small clouds at 15,000 ft above sea level. Satellite data showed that they dissipated quickly. The volcano remains restless and additional explosive events could occur with little warning.
(12) Volcanic cloud height: 15,000 ft asl (maximum)
(13) Other volcanic cloud information: Minor emissions visible in satellite data
(14) Remarks: Status of the ash cloud can be found at the Alaska Aviation Weather Unit website at 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: WATCH

Current Aviation Color Code: ORANGE

Issued: Tuesday, January 17, 2017, 8:56 AM AKST
Source: Alaska Volcano Observatory
Notice Number: 2017/A22
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians

Volcanic Activity Summary: Increased seismic activity over the past several hours indicates that minor explosive activity is occurring at Bogoslof. The level of activity is variable, with the most energetic events observed around 1500 UTC and 1640 UTC (4:00 and 7:40 am AKST). Minor emissions of steam and minor amounts of volcanic ash observed in satellite data around 1500 and 1730 UTC. These events were too small to generate detectable lightning or infrasound (pressure) signals. The National Weather Service has estimated a maximum altitude for these small clouds at 15,000 ft above sea level. Satellite data showed that they dissipated quickly. The volcano remains restless and additional explosive events could occur with little warning.

Recent Observations:
[Volcanic cloud height] 15,000 ft asl (maximum)
[Other volcanic cloud information] Minor emissions visible in satellite data

Remarks: Status of the ash cloud can be found at the Alaska Aviation Weather Unit website at 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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