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  1. 防災科研関係論文

Two subevents across the Japan Trench during the 7 December 2012 off Tohoku earthquake (M-w 7.3) inferred from offshore tsunami records

https://nied-repo.bosai.go.jp/records/4007
https://nied-repo.bosai.go.jp/records/4007
b046ae62-9140-404f-91b8-224e8d33286d
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Two subevents across the Japan Trench during the 7 December 2012 off Tohoku earthquake (M-w 7.3) inferred from offshore tsunami records
言語
言語 eng
著者 Daisuke Inazu

× Daisuke Inazu

en Daisuke Inazu

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Tatsuhiko Saito

× Tatsuhiko Saito

en Tatsuhiko Saito

Search repository
抄録
内容記述タイプ Other
内容記述 A tsunamigenic earthquake with a moment magnitude of 7.3 occurred near the Japan Trench, off Tohoku, northeast Japan, on 7 December 2012. Operational seismic monitoring inferred that the earthquake was composed of doublet sources of comparable magnitudes: the first event was reverse faulting and the second event, which occurred 10-20 s later, was normal faulting. An associated tsunami was observed at offshore stations, having an amplitude of 10(-1) to 10(1) cm. Inverse modeling using the observed tsunami records reveals possible vertical seafloor deformations. We can then constrain, in terms of the source location, that the tsunamigenic earthquake involves two subfaults across the Japan Trench: one is the outer trench reverse faulting as the first event and the second is the inner trench normal faulting. The present study shows that tsunami analysis with seismograph analyses effectively constrains the epicenter locations, even in the case of complex earthquakes like doublets.
言語 en
書誌情報 en : JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH

巻 119, 号 7, p. 5800-5813
出版者
言語 en
出版者 AMER GEOPHYSICAL UNION
ISSN
収録物識別子タイプ EISSN
収録物識別子 2169-9356
DOI
関連識別子 10.1002/2013JB010892
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