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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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KANAGA VOLCANO



Clouds obscured the volcano this week preventing ground and satellite observations. On July 20, an AVO geologist on Adak Island was able to view Kanaga for several hours. As has been reported intermittently by U.S. Fish and Wildlife observers since last fall, fumaroles high on the east and southeast flank of the volcano steamed vigorously and a hazy plume of steam and possibly volcanic gas emanated from the summit crater and drifted a few kilometers downwind. In contrast to other mountain peaks of similar elevation, most of Kanaga was dark and snow-free. One snow patch just below the summit was mantled by debris. It is not known if material mantling the cone is the result of possible activity in late June or, alternatively, merely wind-reworking of material deposited during the extended 1994 eruption.



MOUNT VENIAMINOF



Clouds obscured the volcano for most of the week preventing ground and satellite observations. On Thursday, however, Perryville residents were able to see the volcano and report light steaming over the summit. Satellite imagery from Thursday did not reveal a hot spot within the caldera.



COOK INLET VOLCANOES



Seismic activity at Spurr, Augustine, Redoubt and Iliamna

volcanoes remains at normal background levels.



The Alaska Volcano Observatory continues to seismically

monitor Spurr, Redoubt, Iliamna, and Augustine volcanoes.

We maintain a computerized alarm system that is capable of

notifying AVO seismologists during non-business hours

should unusual seismic activity occur.

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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Page modified: May 27, 2014 10:23
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