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VOLCANO ACTIVITY NOTIFICATIONS

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(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued: (20170708/1901Z)
(3) Volcano: Bogoslof (VNUM #311300)
(4) Current Color Code: RED
(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: Two short duration eruption pulses were detected in seismic data. The first began at 18:15 UTC (10:15 AKDT) that lasted about 9 minutes, followed by a shorter pulse at 18:29 UTC (10:29 AKDT). The cloud has been observed in satellite data at an estimated height of 30,000 ft asl. The Aviation Color Code is being increased to Red and the Alert Level to Warning.

Seismic data has decreased following these two eruption pulses, but additional explosive activity is possible. Winds are towards the north over the Bering sea, and ashfall on populated islands is not likely. The National Weather Service has issued an eruption SIGMET warning for aviation with an eruption cloud height of 30,000 ft. This may be revised as new satellite data becomes available. See http://www.weather.gov/aawu/sigmets for the most current information.
(12) Volcanic cloud height: 30,000 ft based on satellite data.
(13) Other volcanic cloud information: Winds are towards the north
(14) Remarks:
(15) Contacts: Chris Waythomas, Acting Scientist-in-Charge, USGS
chris@usgs.gov (907) 786-7497

Pavel Izbekov, Acting Coordinating Scientist, UAF
GIpavel@gi.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: Saturday, July 8, 2017, 11:01 AM 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: Two short duration eruption pulses were detected in seismic data. The first began at 18:15 UTC (10:15 AKDT) that lasted about 9 minutes, followed by a shorter pulse at 18:29 UTC (10:29 AKDT). The cloud has been observed in satellite data at an estimated height of 30,000 ft asl. The Aviation Color Code is being increased to Red and the Alert Level to Warning.

Seismic data has decreased following these two eruption pulses, but additional explosive activity is possible. Winds are towards the north over the Bering sea, and ashfall on populated islands is not likely. The National Weather Service has issued an eruption SIGMET warning for aviation with an eruption cloud height of 30,000 ft. This may be revised as new satellite data becomes available. See http://www.weather.gov/aawu/sigmets for the most current information.


Recent Observations:
[Volcanic cloud height] 30,000 ft based on satellite data.
[Other volcanic cloud information] Winds are towards the north

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

Pavel Izbekov, Acting Coordinating Scientist, UAF
GIpavel@gi.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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