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ARCHIVED REPORT
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PAVLOF



COLOR CODE: YELLOW



Seismic activity abruptly declined at Pavlof Volcano early Wednesday morning and is presently near background levels, prompting AVO to downgrade the Level of Concern Color Code to YELLOW. Poor weather conditions have prevented direct observation of the volcano, however, the substantial decrease in seismicity implies that eruptive activity--lava fountaining and explosions--has probably abated. The decrease in seismicity may be only a lull in the activity. Typical eruptions at Pavlof are characterized by periods of dimished activity interspersed with the periods of strombolian activity. Renewed lava fountaining and production of local diffuse ash clouds could begin again at any time with little seismic warning. AVO will continue to monitor the volcano closely.



Infrared video taken by the Alaska State Troopers on Monday confirmed that the easternmost of two lava flows was the active flow, and that the eastern summit vent was more active than the western sent. The source of intense steaming low on the north flank that has been intermittently visible to aerial and ground observers for several weeks is not a new flank vent but simply a site where lava is in contact with ice or meltwater. Meltwater channels extend down to the low pass between Pavlof and Paflov Sister and then to the northwest into the Cathedral River drainage.



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 expect 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 about 6 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].

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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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