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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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SPURR



Special Update:



Over the past several months micro-quakes increased significantly (order of mag). It could be forerunner to an eruption, but then again it might not, overflight indicates changes in thermal area at Crater Peak, therefor - share this info and review response plans, max mag to date: ML=1.7, not regional, may be magma intrusion event, no long period events or tremor have been observed for past 72 hours, increase in localized activity beneath Crater Peak seismicity level no longer considered normal, COSPEC: no significant SO2 detected, change in lake color may be due to increase in iron sulfide, may be magma intrusion event eruption, probably not imminent in next few days. AVO will take certain actions.

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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URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: May 27, 2014 10:23
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