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Report on Pavlof (United States) — 23 February-1 March 2022


Pavlof

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 23 February-1 March 2022
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2022. Report on Pavlof (United States) (Sennert, S, ed.). Weekly Volcanic Activity Report, 23 February-1 March 2022. Smithsonian Institution and US Geological Survey.

Weekly Report (23 February-1 March 2022)

Pavlof

United States

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

All times are local (unless otherwise noted)


AVO reported that the eruption at Pavlof was ongoing during 23 February-1 March. Lava effusion continued from a vent just E of the summit and sent a lava flow a short distance down the NE flank. Seismicity was higher with periods of tremor, and elevated surface temperatures were periodically identified in satellite images; both were consistent with continuing lava effusion. Small explosions were detected during 24 and 26-28 February. The Volcano Alert Level remained at Watch and the Aviation Color Code remained at Orange.

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)