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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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BOGOSLOF



1100: A strong seismic signal on the Redoubt and more distant stations was noticed by J. Paskievitch around 1100 on Thursday 8/13. (See description of seismicity by A. Jolly and S. Stihler).

Subsequent discussions with J. Power indicated strong suspicion of a land-slide origin; not 100% certain.

Called Drift River Oil Terminal (DROT) - partly clear weather, hadn't heard or seen anything unusual.

Called NWS - could see a "dark spot" (thermal anomaly?) on image over approximate position of Redoubt.

Later in the afternoon, J. Dorova joined a DROT fixed wing from Kenai and overflew Redoubt; said he saw no change in Drift River but clouds obscured most of dome and north canyon; no evidence of any major disruption. 300 m steam plume over crater.



1930: J. Eichelberger called T. Neal at home, a strong 12-minute signal at RSO. He also called C. Rowe.

T. Neal goes to AVO-Anchorage; called DROT, no sign of anything, mountain is clear although an "odd" looking cumulus cloud sits at the north base of the mountain. Has a conference call with J. Eichelberger, B. Page, J. Power. Facts: big event; in early days we would have called this an eruption; need aerial observations to verify what this is; attempted location and got a very large error; emergent signal problem. Similar to ash and gas emissions from Mount St. Helens but much more energetic, they are not similar to phreatomagmatic signals of Fall 1990 from Redoubt. Didn't set off any alarm because too emergent. No LP signature in SSAM (which did occur in Fall 1990 seismicity). FAA received no PIREPS today of any plume/unusual activity.



2200: Decided to put out an update noting strong seismicity of probably landslide origin but to continue checking seismicity through the night. Checked LDS, no strikes.



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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