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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
COOK INLET VOLCANOES
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.
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