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AVO Archived Volcano Activity Notifications

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ARCHIVED REPORT
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Seismic activity declined last weekend prompting AVO to downgrade the Level of Concern Color Code to Yellow on Sunday, December 15. NWS personnel in Cold Bay had a clear view of the volcano Sunday morning and reported no steam or ash issuing from the summit vents and no other signs of activity. Inclement weather has prevented observations for the remainder of the week. Seismic activity remains low. Eruptions of Pavlof are characterized by periods of lava fountaining and associated lava flows (strombolian activity) interspersed with periods of diminished activity. Renewed lava fountaining and production of local diffuse ash clouds could begin again with little seismic 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). AVO has a seismic network of six stations near the volcano.



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 potentially 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 5 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
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