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  1. 防災科研関係論文

High-frequency source radiation during the 2011 Tohoku-Oki earthquake, Japan, inferred from KiK-net strong-motion seismograms

https://nied-repo.bosai.go.jp/records/2861
https://nied-repo.bosai.go.jp/records/2861
6ca99e75-400d-419f-b785-89b3517f3c4f
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル High-frequency source radiation during the 2011 Tohoku-Oki earthquake, Japan, inferred from KiK-net strong-motion seismograms
言語
言語 eng
著者 Hiroyuki Kumagai

× Hiroyuki Kumagai

en Hiroyuki Kumagai

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Nelson Pulido

× Nelson Pulido

en Nelson Pulido

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Eiichi Fukuyama

× Eiichi Fukuyama

en Eiichi Fukuyama

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Shin Aoi

× Shin Aoi

en Shin Aoi

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抄録
内容記述タイプ Other
内容記述 To investigate source processes of the 2011 Tohoku-Oki earthquake, we utilized a source location method using high-frequency (5-10 Hz) seismic amplitudes. In this method, we assumed far-field isotropic radiation of S waves, and conducted a spatial grid search to find the best fitting source locations along the subducted slab in each successive time window. Our application of the method to the Tohoku-Oki earthquake resulted in artifact source locations at shallow depths near the trench caused by limited station coverage and noise effects. We then assumed various source node distributions along the plate, and found that the observed seismograms were most reasonably explained when assuming deep source nodes. This result suggests that the high-frequency seismic waves were radiated at deeper depths during the earthquake, a feature which is consistent with results obtained from teleseismic back-projection and strong-motion source model studies. We identified three high-frequency subevents, and compared them with the moment-rate function estimated from low-frequency seismograms. Our comparison indicated that no significant moment release occurred during the first high-frequency subevent and the largest moment-release pulse occurred almost simultaneously with the second high-frequency subevent. We speculated that the initial slow rupture propagated bilaterally from the hypocenter toward the land and trench. The landward subshear rupture propagation consisted of three successive high-frequency subevents. The trenchward propagation ruptured the strong asperity and released the largest moment near the trench. Citation: Kumagai, H., N. Pulido, E. Fukuyama, and S. Aoi (2013), High-frequency source radiation during the 2011 Tohoku-Oki earthquake, Japan, inferred from KiK-net strong-motion seismograms, J. Geophys. Res. Solid Earth, 118, 222-239, doi: 10.1029/2012JB009670.
言語 en
書誌情報 en : JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH

巻 118, 号 1, p. 222-239, 発行日 2013-01
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 10.1029/2012JB009670
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