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  1. 防災科研関係論文

Anomalously large seismic amplifications in the seafloor area off the Kii peninsula

https://nied-repo.bosai.go.jp/records/4200
https://nied-repo.bosai.go.jp/records/4200
892ae7fb-d6e2-41f7-aae2-31a30729d0de
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Anomalously large seismic amplifications in the seafloor area off the Kii peninsula
言語
言語 eng
著者 Takeshi Nakamura

× Takeshi Nakamura

en Takeshi Nakamura

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Masaru Nakano

× Masaru Nakano

en Masaru Nakano

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Naoki Hayashimoto

× Naoki Hayashimoto

en Naoki Hayashimoto

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Narumi Takahashi

× Narumi Takahashi

en Narumi Takahashi

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Hiroshi Takenaka

× Hiroshi Takenaka

en Hiroshi Takenaka

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Taro Okamoto

× Taro Okamoto

en Taro Okamoto

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Eiichiro Araki

× Eiichiro Araki

en Eiichiro Araki

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Yoshiyuki Kaneda

× Yoshiyuki Kaneda

en Yoshiyuki Kaneda

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抄録
内容記述タイプ Other
内容記述 Seismic wave amplifications were investigated using strong-motion data obtained from the ground's surface (K-net) on the Kii peninsula (southwestern Japan) and from the network of twenty seismic stations on the seafloor (DONET) located off the peninsula near the Nankai trough. Observed seismograms show that seismic signals at DONET stations are significantly larger than those at K-net stations, independent of epicentral distances. In order to investigate the cause of such amplifications, seismic wavefields for local events were simulated using the finite-difference method, in which a realistic 3D velocity structure in and around the peninsula was incorporated. Our simulation results demonstrate that seismic waves are significantly amplified at DONET stations in relation to the presence of underlying low-velocity sediment layers with a total thickness of up to 10 km. Our simulations also show considerable variations in the degree of amplification among DONET stations, which is attributed to differences in the thickness of the sediment layers. The degree of amplification is relatively low at stations above thin sediment layers near the trough axis, but seismic signals are much more amplified at stations closer to the Kii peninsula, where sediment layers are thicker than those at the trough axis. Simulation results are consistent with observations. This study, based on seafloor observations and simulations, indicates that because seismic signals are amplified due to the ocean-specific structures, the magnitude of earthquakes would be overestimated if procedures applied to data observed at land stations are used without corrections.
言語 en
書誌情報 en : MARINE GEOPHYSICAL RESEARCH

巻 35, 号 3, p. 255-270
出版者
言語 en
出版者 SPRINGER
ISSN
収録物識別子タイプ EISSN
収録物識別子 1573-0581
DOI
関連識別子 10.1007/s11001-014-9211-2
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