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ARCHIVED REPORT
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BOGOSLOF



AVO learned that John Reeder (ADGGS) had information through FAA from a fisherman that a "new rock" formation had been sighted between Fire Island and old Bogoslof; this new rock was steaming, a crack extended from the top to the shore, unsure of the size (this report was from 7 July); no PIREPS today.

R/V Alpha Helix(master Tom Callahan, Inst. Marine Science, Mickey 224-5261) had a good look at Bogoslof. "It was pretty spectacular". At 2200, from 10 km west of Bogoslof, the volcano "seemed to be emitting a large amount of steam and ash". Sketch below, view from 7 km west of Bogoslof Is.



1730: 747 notes possible volcanic plume to 7900 m; dark cloud drifting NW.



1745: 747 at 10700 m reports "smoke" in vicinity of Bogoslof.



2056: Beech at 6100 m, 60 km north of Dutch Harbor saw dark gray cloud rising north-west of Bogoslof, 16 km wide at 4300-4600 m altitude; volcano appears to still be erupting but could not see volcano directly.

SIGMET issued; FAA says 50% of aircraft saw activity.

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].

PDF version of these definitions
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URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: May 27, 2014 10:23
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