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ARCHIVED REPORT
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MOUNT CLEVELAND



Mount Cleveland, in the central Aleutian Island, ejected a single burst of ash on Wednesday afternoon. Pilots reported an ash cloud rising to 35,000 ft ASL. National Weather Service satellite imagery showed that the cloud was small and drifted northeast over the Bering Sea. A vigorous steam plume has been observed at the volcano during the past month. See the May 25 AVO Information Release for more information on Mount Cleveland.



SHISHALDIN



On Monday a possible eruption of Shishaldin was reported, but further analysis revealed the cause to be meteorological phenomena. Shishaldin is one of the most active volcanoes in the Aleutian arc and continuously emits a low-level steam plume.



KANAGA VOLCANO



Inclement weather prevented ground observers from viewing the volcano this week.



VENIAMINOF



Residents in Perryville reported that last Friday afternoon, a large steam plume was visible rising from Veniaminof. Incliment weather prevented observations of any eruptive activity at the volcano this week.



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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