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Archived Report
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REDOUBT VOLCANO



00:00: Seismicity at pre-explosive level; level of concern color code downgraded to YELLOW.



AM: Partial dome observed in summit crater. Segment of glacier from 4500 to 2200 feet conspicuously torn up by yesterday's event--freshly carved scarps with big nearly detached blocks.

Pyroclastic flowage of coarse gravel-sized material lies within wide canyons in 2700-3000 foot segment. Finer-grained sand-sized pf overlies piedmont lobe down to about 1850 ft. level, a few decimeters thick at most. Minor blast swept up [east] canyon wall from 3000-2700 ft. level nearly to area where station RDN had been.

Dome-rock debris and ice chunks swept down the east gully and onto the Drift Valley apparently as a debris flow.



PM: AVO field crew notes several fluctuations in discharge near the mouth of the eastside channel near the terminus of the glacier as well as near the mouth of crater creek.

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
URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: June 11, 2012 11:50
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