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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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PAVLOF



COLOR CODE: ORANGE



Following a lull in the eruption from December 4 to 8, the seismicity at Pavlof increased substantially on Monday prompting AVO to upgrade the Level of Concern Color Code on Tuesday to Orange and then to Red. On Wednesday, pilots reported a steam plume up to 28,500 feet ASL and an associated ash cloud up to 17,000 feet ASL. Seismicity declined on Thursday and AVO downgraded the Color Code to Orange. Lava fountaining from the summit vents and intermittent bursts of steam and ash to altitudes below 20,000 feet ASL continues. Two lava flows are still active on the north flank. Seismic activity could increase with little or no warning. AVO will continue to monitor the volcano closely and issue further updates as the situation changes.



Pavlof is located 600 miles southwest of Anchorage. The nearest towns to the volcano are Cold Bay (37 mi SW), King Cove (30 mi SW), Sand Point (60 mi E), and Nelson Lagoon (50 mi NE). These towns could receive light ash fall depending on wind direction and level of eruptive activity.



OTHER VOLCANOES



Seismic activity is monitored in real time at the following volcanoes. Some of the volcanoes listed below may have anomalous seismicity, as noted, but are not considered to be at a dangerous level of unrest.



Iliamna



The seismic swarm that began on 1 August 1996 beneath Iliamna Volcano continued during the past week at an average rate of 7 earthquakes per day.



Spurr, Redoubt, Augustine, Griggs, Katmai, Trident, Mageik, Martin, Dutton, Akutan, and Makushin volcanoes are all at or near normal levels of seismicity.



ADDITIONAL INFORMATION



AVO maintains a computerized alarm system capable of

notifying AVO seismologists during non-business hours

should unusual seismic activity occur at monitored Alaskan

volcanoes.

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
Contact Information: AVO Web Team

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