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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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SPURR





The level of seismicity beneath Mt. Spurr remains low although the number of small shallow events has increased slightly over the past week. These events are probably related to increased snowmelt interacting with the shallow hydrothermal system. The current level of concern color code is GREEN.



OTHER COOK INLET VOLCANOES



Seismicity at Augustine and Redoubt volcanoes remains at

normal levels.



SEGUAM



The U.S. Coast Guard reported May 28, 1993 sighting one small ash burst rising through clouds near Pyre Peak, on Seguam Island. Tuesday, June 2, 1993, the National Weather Service reported a plume to 10,000 feet. No confirmation of ash in the plume has been received.

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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