Report on Pavlof (United States) — July 1987

Scientific Event Alert Network Bulletin, vol. 12, no. 7 (July 1987)
Managing Editor: Lindsay McClelland.

Pavlof (United States) Activity decreases; steam and ash emission

Please cite this report as:

Global Volcanism Program, 1987. Report on Pavlof (United States). In: McClelland, L (ed.), Scientific Event Alert Network Bulletin, 12:7. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.SEAN198707-312030.

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Pavlof

United States

55.417°N, 161.894°W; summit elev. 2493 m

All times are local (unless otherwise noted)


Activity appeared to decrease during July. A 460-m-high steam plume was sighted on 6 July by R. Williams (Peninsula Airways) from Nelson Lagoon, and a small amount of what appeared to be ash on the summit and N flank was reported on 11 July by Marsha Brown (FAA, Cold Bay). The weather was generally poor for the rest of the month but numerous pilots reported that no eruptive activity was occurring on 26 and 28 July.

Geologic Background. The most active volcano of the Aleutian arc, Pavlof is a 2519-m-high Holocene stratovolcano that was constructed along a line of vents extending NE from the Emmons Lake caldera. Pavlof and its twin volcano to the NE, 2142-m-high Pavlof Sister, form a dramatic pair of symmetrical, glacier-covered stratovolcanoes that tower above Pavlof and Volcano bays. A third cone, Little Pavlof, is a smaller volcano on the SW flank of Pavlof volcano, near the rim of Emmons Lake caldera. Unlike Pavlof Sister, Pavlof has been frequently active in historical time, typically producing Strombolian to Vulcanian explosive eruptions from the summit vents and occasional lava flows. The active vents lie near the summit on the north and east sides. The largest historical eruption took place in 1911, at the end of a 5-year-long eruptive episode, when a fissure opened on the N flank, ejecting large blocks and issuing lava flows.

Information Contacts: J. Reeder, ADGGS.