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Report on Pavlof (United States) — July 1976


Pavlof

Natural Science Event Bulletin, vol. 1, no. 10 (July 1976)
Managing Editor: David Squires.

Pavlof (United States) Ash on N slope; heavy steaming

Please cite this report as:

Global Volcanism Program, 1976. Report on Pavlof (United States) (Squires, D., ed.). Natural Science Event Bulletin, 1:10. Smithsonian Institution. https://doi.org/10.5479/si.GVP.NSEB197607-312030



Pavlof

United States

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

All times are local (unless otherwise noted)


4 July, 0600-2200: black ash noted on the N slope. 15 July, 2000-2300: heavy steam blown down the W slope. 18 July, 1600-2300: heavy steam emitted. 23 July, 2100-2200: no activity.

Geological Summary. The most active volcano of the Aleutian arc, Pavlof is a Holocene stratovolcano that was constructed along a line of vents extending NE from the Emmons Lake caldera. Pavlof and Pavlof Sister to the NE form a dramatic pair of symmetrical, glacier-covered stratovolcanoes that overlook Pavlof and Volcano bays. Little Pavlof is a smaller cone on the SW flank of Pavlof volcano, near the rim of Emmons Lake caldera. Unlike Pavlof Sister, eruptions have frequently been reported from Pavlof, typically 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 recorded 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: R. Dean, USAF, Cold Bay.