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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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ATKA ISLAND



On Saturday, December 4, following a magnitude 5.1 earthquake which occurred at 0636 beneath the central Aleutian island of Atka, residents of Atka village reported "rumbling" from the cluster of volcanoes which form the north part of the island. At the same time, residents observed increased steaming from a fumarolic area on the flank of Kliuchef Volcano and noted a distinct sulphur smell. A check of satellite imagery did not confirm any change in the surface state of the volcanoes. Late this week, the weather had deteriorated and no visual observations of the volcanoes were possible.



The Atka volcanic center is composed of a cluster stratovolcanoes the most active of which, Korovin, has erupted as many as nine times since the early 1800's. Atka village is located about 8 miles southwest of the nearest active volcano, Kliuchef. AVO maintains no monitoring devices on Atka Island. As such, AVO will monitor the situation through collection of pilot reports, observations of Atka residents and periodic checking of satellite imagery.



VENIAMINOF



Poor weather for most of the past week prevented observers in Port Heiden from viewing Veniaminof Volcano. AVO received no reports of eruptive activity from pilots. The National Weather Service reports that no sign of activity was detected on satellite imagery.



COOK INLET VOLCANOES



Seismic activity beneath Mt. Spurr remains low. The Current Level of Concern Color Code is GREEN.



Seismicity at Augustine, Redoubt and Iliamna volcanoes remains at normal levels.

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