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LEVEL OF CONCERN COLOR CODE: ORANGE
LAST LEVEL OF CONCERN: ORANGE
Eruptive activity continues at Pavlof Volcano. Seismicity, satellite imagery and recent visual observations indicate ongoing lava fountaining from two vents near the summit of the volcano. Intermittent bursts of lava to heights of less than 1000 feet above the crater persist. These bursts result in a diffuse ash layer that pilots report to be typically below 20,000 feet ASL. A lava flow courses down the steep, snow-and ice-covered slope of the volcano, widening at the base and extending northwest. Weather conditions currently prevent direct observation of the volcano. Based on the level of the seismicity and the nature of this current eruption, 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