This is a seismogram from the KOFP seismic station on Atka Island in Alaska's Aleutian Islands. The noise is from a volcanic explosion at the summit of Korovin Volcano. It occurred at 7:36 PM, local time, on 27 March 2024. Korovin Volcano is a subduction zone stratovolcano near the northern edge of eastern Atka Island.
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Info. at:
en.wikipedia.org/wiki/Korovin_Volcano
and
volcano.si.edu/volcano.cfm?vn=311160
and
volcanoes.usgs.gov/hans-public/volcano/ak17
Tags: Korovin Volcano March 2024 Aleutian Islands Alaska summit volcanic explosion explosions 27 subduction zone