Back-Projection Imaging of a Tsunami Excitation Area With Ocean-Bottom Pressure Gauge Array Data

Mizutani, Ayumu; Yomogida, Kiyoshi

Back-Projection Imaging of a Tsunami Excitation Area With Ocean-Bottom Pressure Gauge Array Data

Mizutani, Ayumu; Yomogida, Kiyoshi

Journal of Geophysical Research Oceans, 2022, 127(7), e2022JC018480

Permalink : https://hdl.handle.net/2115/86542

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論文情報

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アクセス権	open access
URI	https://hdl.handle.net/2115/86542
タイトル	Back-Projection Imaging of a Tsunami Excitation Area With Ocean-Bottom Pressure Gauge Array Data
著者	著者名 Mizutani, Ayumu
著者	e-Rad_Researcher 70230844 著者名 Yomogida, Kiyoshi
言語	英語
キーワード	tsunamis
	back-projection analysis
	tsunami early warning
	tsunami diffraction
	array analysis
発行日	2022-07
出版者	American Geophysical Union
収録物名	Journal of Geophysical Research Oceans
巻(号)	127(7)
ページ	e2022JC018480
抄録	A back-projection method has been applied to many earthquakes in seismology due to its simple and low computational cost, and it can estimate complex fault rupture processes without any specific a priori information. In this study, we applied the back-projection method to the tsunami records observed using an ocean-bottom pressure gauge array and demonstrated it to be a powerful new tool other than the familiar waveform inversion. The obtained back-projection image was consistent with the initial tsunami height distributions estimated by previous waveform inversions, and its spatial resolution appeared to be even better. Our result suggests that the fault size of the 2016 Off-Fukushima earthquake was about half, different from the scaling law of standard earthquakes. The present tsunami back-projection analysis can also estimate the feature of early tsunami propagations. In addition, the estimated image seems to be reliable even 30 min after the origin time, so the back-projection analysis will be useful in an early detection of the location and spatial extent of a tsunami source. In the present case, the number of available stations in the analysis was found to be affected by the diffraction of tsunami propagation caused by the refraction by a high velocity zone near the Japan Trench. In other words, the further the source is from the coast, the more stations to be analyzed are available. Since most tsunami-generating earthquakes occur near the subduction axis or its outer-rise region, the back-projection analysis should be effective for source estimation of the majority of tsunami-generating earthquakes.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	An edited version of this paper was published by AGU. Copyright 2022 American Geophysical Union.
権利情報	Ayumu Mizutani, Kiyoshi Yomogida, (2022), Back-Projection Imaging of a Tsunami Excitation Area With Ocean-Bottom Pressure Gauge Array Data, Journal of Geophysical Research Oceans, 127(7), e2022JC018480, DOI:10.1029/2022JC018480. To view the published open abstract, go to https://doi.org/10.1029/2022JC018480
PISSN	2169-9275
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1029/2022JC018480