Helicorder record for seismic station OKER on Umnak Island, showing explosive eruptions on December 28 and 29 (AKST), 2016, from Bogoslof volcano. Station OKER is 53 km south of Bogoslof Island and is located on the rim of Okmok caldera. The two Bogoslof eruptions show up as continuous seismic signals, each lasting about 40 minutes. Also seen on this figure are regional earthquakes, calibration pulses, and a roughly 13-hour period of high wind. A 1-5 Hz filter has been applied to the seismic data in this image.
Image courtesy of AVO/USGS.
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