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Eruptive activity continues at Pavlof Volcano. Several brief (20-30 minute) periods of intense seismicity occurred today, the first beginning this morning at about 11:30 AM AST (2030 UTC). Pilot reports indicate a steam plume rising to 20,000 to 30,000 feet ASL and extending downwind to the west. Poor weather obscured the volcano for most of the week; seismicity and brief ground observations indicate continued lava fountaining from the two vents in the summit crater. This activity continues to produce a diffuse ash layer that observers report to be typically below 20,000 feet ASL. At least one of the two lava flows continues to advance down te 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 Dutton, Makushin, Akutan, and Katmai area volcanoes. Reports on these volcanoes will appear in a newly formatted version of the Weekly Update in the nest several weeks.