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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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BOGOSLOF



0900: AVO hut camera shows large dark scallop NW of dome-landslide scar? Check of video tape at AVO-Fairbanks shows it wasn't there in late July on last clear images.

DROT took helicopter flight up to area, message from Ron Green about rockfalls.



1015: National Park Service got a good look at avalanche scar, couldn't see any big change in dome area, nothing significant in canyon area. Saw rockfalls continuing while they flew around the area. Not a big slide.



1150-1220: D. Meyer and T. Neal overflew area, verified that the lava dome was unchanged surface steaming strongly; no vertical plume however; outlet creek steaming to base of waterfall. Saw and photographed partially cloud-obscured ice and rock avalanche scar NW of dome about 2200 m elevation; base of avalanche cloud covered. Estimated scar width about 300-500 m; probably freefall of at least 500 m - enough energy to trigger Skilak and Knik stations? No sign of fine dust or any particulate fallout in area around slide, explaining no plume sighting. Saw small rockfall from scar and orangy haze in front of scar. Free ice face at headwall looked several 10's of meters thick on video (unfortunate poor quality - bumpy ride and cloud- obscured view) so volume of fall could have been significant - on the order of 0.5 1.0 million cubic meters. Ducked below upper cloud layer and flew over piedmont lobe of Drift Glacier; saw several muddy surges with standing waves (meter-scale) flowing down west canyon drainage and joining the clear Drift River. Earlier flows had slopped over several-meter-high banks. On Thursday and continuing into Friday afternoon there must have been releases of water from melting of snow and ice in avalanche deposit which picked up fines on the way down across pits and piedmont. Did not get a good feeling for the extent of avalanche deposits in canyon; a dark swath in upper pits and above could have been the deposit but we didn't get a good enough look. Crater Creek seemed muddier than usual but not as affected as west canyon. No effect noted on piedmont proper. At least one stream gauge did see a peak just following activity on morning of 8/13, so there was a meters-high water pulse, probably initiated by melting of ice and snow in avalanche.

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: May 27, 2014 10:23
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