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Report on Davidof (United States) — 26 January-1 February 2022


Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 26 January-1 February 2022
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2022. Report on Davidof (United States) (Sennert, S, ed.). Weekly Volcanic Activity Report, 26 January-1 February 2022. Smithsonian Institution and US Geological Survey.

Weekly Report (26 January-1 February 2022)


United States

51.97°N, 178.33°E; summit elev. 328 m

All times are local (unless otherwise noted)

An earthquake swarm, either related to tectonic processes or volcanic unrest, was recorded in the vicinity of Davidof during 25-26 January. The largest earthquake was a M 4.9 recorded at 1602 on 25 January. AVO raised the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory due to the possibility of escalating volcanic unrest. Small earthquakes were detected during 27 and 29 January-1 February, though at a lower rate. No anomalous activity was visible in partly-to-mostly cloudy satellite and webcams views. A similar earthquake swarm occurred in December 2021.

Geological Summary. A cluster of small islands between Segula and Little Sitkin in the western Aleutians, the largest of which is Davidof, are remnants of a stratovolcano that collapsed during the late Tertiary, forming a 2.7-km-wide caldera. The islands include Khvostof, Pyramid, Lopy, and Davidof; the latter three form the eastern rim of the mostly submarine caldera, sometimes referred to as the "Aleutian Krakatau." The islands were constructed above a roughly 100-m-deep submarine platform extending NW to Segula Island; the floor of the caldera lies 80 m below sea level. The islands are vegetated, but lava flows are recognizable, and Smith et al. (1978) suggested a possible Holocene age.

Source: US Geological Survey Alaska Volcano Observatory (AVO)