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VOLCANO ACTIVITY NOTIFICATIONS

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(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued: (20170608/0605Z)
(3) Volcano: Bogoslof (VNUM #311300)
(4) Current Color Code: ORANGE
(5) Previous Color Code: ORANGE
(6) Source: Alaska Volcano Observatory
(7) Notice Number:
(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: A short duration explosive event occurred at Bogoslof volcano at 5:28 UTC on 8 June (21:28 AKDT on 7 June). Seismic and infrasound signals indicate that this event was very similar to the event from earlier today at 14:30 UTC. The duration of the event was less than 2 minutes, and seismicity and infrasound returned to low levels following the explosion. A small steam-rich volcanic cloud is visible in satellite data, rising no more than 10,000 ft asl. Due to the brevity of the event, the Aviation Color Code remains at ORANGE and the Volcano Alert Level remains at WATCH.
(12) Volcanic cloud height: 10,000 ft asl
(13) Other volcanic cloud information: White in visible wavelength satellite data.
(14) Remarks: The National Weather Service has issued a SIGMET warning for aviation for a volcanic cloud up to 10,000 ft asl. See http://aawu.arh.noaa.gov/sigmets.php for updated information.
(15) Contacts: Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497

Jessica Larsen, Acting Coordinating Scientist, UAF
jflarsen@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: Wednesday, June 7, 2017, 10:05 PM AKDT
Source: Alaska Volcano Observatory
Notice Number:
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians

Volcanic Activity Summary: A short duration explosive event occurred at Bogoslof volcano at 5:28 UTC on 8 June (21:28 AKDT on 7 June). Seismic and infrasound signals indicate that this event was very similar to the event from earlier today at 14:30 UTC. The duration of the event was less than 2 minutes, and seismicity and infrasound returned to low levels following the explosion. A small steam-rich volcanic cloud is visible in satellite data, rising no more than 10,000 ft asl. Due to the brevity of the event, the Aviation Color Code remains at ORANGE and the Volcano Alert Level remains at WATCH.

Recent Observations:
[Volcanic cloud height] 10,000 ft asl
[Other volcanic cloud information] White in visible wavelength satellite data.
[Lava flow/dome] NA
[Lava flow] N/A

Remarks: The National Weather Service has issued a SIGMET warning for aviation for a volcanic cloud up to 10,000 ft asl. See http://aawu.arh.noaa.gov/sigmets.php for updated information.

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

Jessica Larsen, Acting Coordinating Scientist, UAF
jflarsen@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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