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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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REDOUBT VOLCANO



07:00: Signal amplitudes on flank stations decrease slightly while amplitude on summit station increases slightly.



10:13: Onset of eruption heralded by strong tremor.



10:15: First major explosive event; plume to 10+ km; ash to NE; debris flows and floods.



10:16: Pilot report of ash and steam plume to 25,000 ft.



10:20: Pilot report of plume to 33,000 ft, moving NE.



10:21: Pilot report of plume to 35,000 ft.



11:30: FAA report of leading edge of plume passing over Anchorage.



11:40 Ashfall at Big Rivers Lake Lodge 25 miles NE of Redoubt for about 35 minutes--fine ash and pumice fragments 1-2 cm in length.



11:45: Ash fall reported at Mt. Susitna, Beluga Power and areas west of Anchorage.



17:00: Last crew evacuates from Drift River Oil Facility (DROF); no reports of flooding during day. Estimated snow depth near terminus of Drift glacier is about 3 feet. DROF crews return on 12/27 at 1000.



19:15 - 22:45: Two bursts of seismic activity occurred, each lasting about 1 hour; there were no known ash plumes reported during these events.

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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