Report on Pavlof (United States) — 19 January-25 January 2022
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 19 January-25 January 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, 19 January-25 January 2022. Smithsonian Institution and US Geological Survey.
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 18-25 January, with periods of elevated tremor. Small daily explosions were recorded on local and regional infrasound sensors during 18-22 January. A satellite image from 19 January showed that the lava flow on the E flank was 1.3 km long, and a lahar on the same flank was 4.4 km long. Elevated surface temperatures consistent with the active lava flow persisted through 25 January. 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.