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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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MOUNT CLEVELAND



During the past week, no additional eruptive activity was

noted at Mount Cleveland in the central Aleutian Islands.

On May 25, pilots reported a burst of ash rising an estimated 35,000 ft ASL.



KANAGA VOLCANO

Navy and U.S. FIsh and Wildlife Service personnel in Adak report seeing a "gray" steam plume rising 3000 - 4000 feet over Kanaga Volcano on Thursday. Poor weather prevented additional observations earlier in the week. AVO received no pilot reports of continuing eruptive activity.



VENIAMINOF



Residents of Port Heiden observed a steam plume over Veniaminof Volcano on Thursday. AVO received no pilot reports of continuing eruptive activity.



COOK INLET VOLCANOES



Seismicity at Spurr, Augustine, Redoubt and Iliamna

volcanoes remains at normal levels.



The Alaska Volcano Observatory continues to seismically

monitor Spurr, Augustine, Redoubt and Iliamna 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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