Co-eruptive tremor from Bogoslof volcano: seismic wavefield composition at regional distances
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Date
2020-01-25
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Citation of Original Publication
Haney, M.M., Fee, D., McKee, K.F. et al. Co-eruptive tremor from Bogoslof volcano: seismic wavefield composition at regional distances. Bull Volcanol 82, 18 (2020). https://doi.org/10.1007/s00445-019-1347-0
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
We analyze seismic tremor recorded during eruptive activity over the course of the 2016–2017 eruption of Bogoslof volcano,
Alaska. Only regional recordings of the tremor wavefield exist for Bogoslof, making it a challenge to place the recordings in
context with other eruptions that are normally captured by local seismic data. We apply a technique of time-frequency polarization analysis to three-component seismic data to reveal the wavefield composition of Bogoslof eruption tremor. We find that at
regional distances, the tremor is dominated by P-waves in the band from 1.5 to 10 Hz. Using this information, along with an
enriched Bogoslof earthquake catalog, we obtain estimates of average reduced displacement (DR) for eruption tremor during 25
of the 70 Bogoslof events. DR reaches as high as approximately 40 cm2 for two of the major events, similar to other VEI~3
eruptions in Alaska. Overall, average reduced displacement displays a weak correlation to plume height during the first half of the
9-month-long eruption sequence, with a few notable exceptions. The two events with the highest DR values also generated
measurable eruption tremor at very-long-periods (VLP) between 0.05 and 0.15 Hz.