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AVO Archived Volcano Activity Notifications

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Archived Report
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Eruptive activity continues at Pavlof Volcano. Seismicity, satellite imagery, and observations this week indicate continued lava fountaining from two vents in the summit crater, and intermittent bursts to heights of less than 1000 feet above the summit. The activity is producing a diffuse ash layer that pilots and ground observers report to be typically below 20,000 feet ASL, but occasionally rising this week to altitudes of 23,000 to 24,000 feet ASL. Observers in Sand Point, Nelson Lagoon, and Cold Bay also reported a steam and ash plume, rising from low on the north flank, to altitudes as high as the plume issuing from the summit vents. Although the source of the plume has not been directly viewed, the presence of ash suggests the possibility of a new vent low on the north flank. Two lava flows continue to advance down the north flank. Lava fountaining and production of local diffuse ash clouds are likely to continue for weeks or months. The Level of Concern Color Code remains at ORANGE and AVO will continue to monitor the volcano closely.



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.



COOK INLET VOLCANOES

ILIAMNA VOLCANO



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. All events

were less than 10 km deep. Most magnitudes were less than

1.0. This seismicity is likely related to an intrusion of magma beneath Iliamna, however such an intrusion does not mean an eruption is imminent.



Seismic activity at Spurr, Redoubt, and Augustine

volcanoes remains at normal background levels.



ADDITIONAL INFORMATION



AVO maintains a computerized alarm system capable of

notifying AVO seismologists during non-business hours

should unusual seismic activity occur at Spurr, Iliamna,

Augustine, or Akutan volcanoes. AVO continues to test new

seismic networks at Pavlof, Dutton, Makushin, Akutan, and

Katmai area volcanoes. Reports on these volcanoes will be

added to this update as data acquisition and analysis

become reliable. We anticipate that this will occur by

mid-November.

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
URL: avo.alaska.edu/activity/avoreport_archives.php
Page modified: June 11, 2012 11:50
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