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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 pilot reports indicate ongoing lava fountaining from two vents near the summit of the volcano. Early this week, AVO staff filmed intermittent bursts of lava to heights of less than 1000 feet above the crater. These bursts result in a diffuse ash layer that pilots report to be typically below 20,000 feet ASL and extending perhaps as far as 100 miles downwind. A lava flow courses down the steep, snow- and ice-covered slope of the volcano, widening at the base and extending northwest. Based on the level of seismicity and the nature of this current eruption, lava fountaining, lava flows, and localized, diffuse ash clouds are likely to 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 with magnitudes of less than 1.0. All earthquakes have been volcano-tectonic (VT); no long-period earthquakes or tremor that usually precede volcanic eruptions have been observed. 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 mid-November.