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LEVEL OF CONCERN COLOR CODE: ORANGE
LAST LEVEL OF CONCERN: ORANGE
Eruptive activity continues at Pavlof Volcano. Intermittent narrow plumes, extending up to several hundred kilometers downwind, were visible on satellite images. Pilots reported diffuse steam and ash plumes above the volcano up to 16,000 feet ASL. A lava flow courses down the steep west slope of the volcano and interaction of lava with snow and ice produces a minor steam plume low on the west flank. A second lava flow was observed this week extending down the northwest flank, apparently fed by spatter from the east summit vent. A light ashfall occurred at Nelson Lagoon on Monday morning. Weather conditions this week have permitted occasional direct observation of the volcano and lava fountaining continues from both summit vents. Based on this level of seismicity and the nature of this current eruptions, lava fountaining, lava flows, and localized, diffuse ash clouds are likely to continue for weeks or months. The Level of Concern Color Code will remain 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. Mudflows and some flooding could occur near the
volcano. The hazard to aircraft from airborne ash may be
considerable if a large explosive event occurs, however
during the more typical lava fountaining activity at
present, this hazard is minor.
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