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Strong-motion Broadband Displacements from Collocated Ocean-bottom Pressure Gauges and Seismometers
  • Ayumu Mizutani,
  • Diego Melgar,
  • Kiyoshi Yomogida
Ayumu Mizutani
Hokkaido University

Corresponding Author:[email protected]

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Diego Melgar
University of Oregon
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Kiyoshi Yomogida
Hokkaido University
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Abstract

Dense and broad-coverage ocean-bottom observation networks enable us to obtain near-fault displacement records associated with an offshore earthquake. However, simple integration of ocean-bottom strong-motion acceleration records leads to physically unrealistic displacement records. Here we propose a new method using a Kalman filter to estimate coseismic displacement waveforms using the collocated ocean-bottom seismometers and pressure gauges. First, we evaluate our method using synthetic records and then apply it to an offshore Mw 6.0 event that generated a small tsunami. In both the synthetic and real cases, our method successfully estimates reasonable displacement waveforms. Additionally, we show that the computed waveforms improve the results of the finite fault modeling process. In other words, the proposed method will be useful for estimating the details of the rupture mechanism of offshore earthquakes as a complement to onshore observations.
12 Dec 2023Submitted to ESS Open Archive
27 Dec 2023Published in ESS Open Archive