Using earthquakes, T waves, and infrasound to investigate the eruption of Bogoslof Volcano, Alaska

Aaron Wech; Gabrielle Tepp; John J. Lyons; Matthew M. Haney

doi:10.1029/2018gl078457

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Using earthquakes, T waves, and infrasound to investigate the eruption of Bogoslof Volcano, Alaska

Aaron Wech·Gabrielle Tepp·John J. Lyons·Matthew M. Haney

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Abstract

The 2016‐2017 eruption of Bogoslof volcano, a submarine stratovolcano in the Bering Sea, produced 70 discrete explosive eruptions over 8 months. With no local monitoring data, activity was seismically recorded on nearby islands 50‐100 km away, limiting the detection and resolution of seismic observations. We construct a matched filter catalog of 3199 events from 49 earthquake families, many of which occurred with hydroacoustic T waves of varying strength. We then use a 2D finite difference model to show that hydroacoustic amplitudes should decrease with increased source depth beneath the edifice and leverage each family's seismically recorded T wave amplitude as a proxy for source depth, which we compare to regional infrasound data. This unique combination of using P and S waves to detect events, T waves as a proxy for depth, and infrasound for precise timing of emissions allows us to interpret the dynamics and evolution of the Bogoslof eruption.

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Geophysical Research Letters Article

Source-reported bounding extent: 53.92021282471509° to 53.95335826795407° latitude; -168.06129455566406° to -168.01769256591797° longitude. This indicates report coverage, not an exact sampling location. View area on OpenStreetMap.

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Aaron Wech, Gabrielle Tepp, John J. Lyons, Matthew M. Haney. 2018-07-25. Using earthquakes, T waves, and infrasound to investigate the eruption of Bogoslof Volcano, Alaska. https://doi.org/10.1029/2018gl078457

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