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Early tsunami detection with near-fault ocean-bottom pressure gauge records based on the comparison with seismic data

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Title: Early tsunami detection with near-fault ocean-bottom pressure gauge records based on the comparison with seismic data
Authors: Mizutani, Ayumu Browse this author
Yomogida, Kiyoshi Browse this author →KAKEN DB
Tanioka, Yuichiro Browse this author →KAKEN DB
Keywords: tsunami early warning
ocean bottom pressure gauge
near-fault observation
Issue Date: Sep-2020
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research, Oceans
Volume: 125
Issue: 9
Start Page: e2020JC016275
Publisher DOI: 10.1029/2020JC016275
Abstract: Offshore real-time ocean bottom networks of seismometers and ocean bottom pressure (OBP) gauges have been recently established such as DONET and S-net around the Japanese islands. One of their purposes is to practice rapid and accurate tsunami forecasting. Near-fault OBP records, however, are always contaminated by nontsunami components such as sea-bottom acceleration change until an earthquake stops its fault or sea-floor motions. This study proposes a new method to separate tsunami and ocean bottom displacement components from coseismic OBP records in a real-time basis. Associated with the Off-Mie earthquake of 2016 April 1, we first compared OBP data with acceleration, velocity, and displacement seismograms recorded by seismometers at common ocean bottom sites in both time and frequency domains. Based on this comparison, we adopted a band-pass filter of 0.05–0.15 Hz to remove ocean-bottom acceleration components from the OBP data. Resulting OBP waveforms agree well with the tsunami components estimated by a 100-s low-pass filter with records of several hundred seconds in length. Our method requires only an early portion of a given OBP record after 30 s of an origin time in order to estimate its tsunami component accurately. Our method enhances early tsunami detections with near-fault OBP data; that is, it will make a tsunami forecasting system faster and more reliable than the previous detection schemes that require data away from source regions or after coseismic motions are over.
Rights: Copyright 2020 American Geophysical Union.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 蓬田 清

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