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Report on Pavlof (United States) — 13 July-19 July 2016


Pavlof

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 13 July-19 July 2016
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2016. Report on Pavlof (United States) (Sennert, S, ed.). Weekly Volcanic Activity Report, 13 July-19 July 2016. Smithsonian Institution and US Geological Survey.

Weekly Report (13 July-19 July 2016)

Pavlof

United States

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

All times are local (unless otherwise noted)


AVO reported that seismic activity at Pavlof remained elevated during 13-19 July. A steam plume was visible in satellite images and reported by observers in Sand Point (90 km E) on 18 July. The next day persistent steam plumes with occasional minor ash-producing explosions were observed in satellite views. The Aviation Color Code remained at Yellow and Volcano Alert Level remained at Advisory.

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.

Source: US Geological Survey Alaska Volcano Observatory (AVO)