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  1. 防災科研関係論文

The seismicity, fault structures, and stress field in the seismic gap adjacent to the 2004 Mid-Niigata earthquake inferred from seismological observations

https://nied-repo.bosai.go.jp/records/4997
https://nied-repo.bosai.go.jp/records/4997
57bc314a-c604-4529-ae28-3828b1a7520a
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル The seismicity, fault structures, and stress field in the seismic gap adjacent to the 2004 Mid-Niigata earthquake inferred from seismological observations
言語
言語 eng
著者 Kazutoshi Imanishi

× Kazutoshi Imanishi

en Kazutoshi Imanishi

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Yasuto Kuwahara

× Yasuto Kuwahara

en Yasuto Kuwahara

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Tetsuya Takeda

× Tetsuya Takeda

en Tetsuya Takeda

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Yoshikatsu Haryu

× Yoshikatsu Haryu

en Yoshikatsu Haryu

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抄録
内容記述タイプ Other
内容記述 We investigate the seismicity, fault structures, and stress field in the southern seismic gap adjacent to the source region of the 2004 Mid-Niigata earthquake based on precise earthquake locations and focal mechanism solutions. The double-difference earthquake locations reveal detailed fault structures including five discrete clusters. A stress tensor inversion method indicates that, at the southern ends of the Muikamachi and the Tokamachi faults, the stress state changes from thrust faulting to a strike-slip faulting regime. We show two possibilities for the deep-fault geometry of the southern part of the Muikamachi fault. Our preferred fault geometries of the Muikamachi fault differ from that of the mainshock, especially for the geometry of the dip direction. It is likely that the Muikamachi fault is divided into two segments whose boundary corresponds to the southern end of the source region of the 2004 event, and that the rupture area was terminated due to this fault segment boundary. The Coulomb failure stresses that are induced by the mainshock and the largest aftershock increase at the southern part of the Muikamachi faults. Furthermore, the angle between the maximum principal stress and the preferred fault planes implies that the shear stress resolving along the planes are large. This evidence suggests a high seismic risk in the seismic gap.
言語 en
書誌情報 en : EARTH PLANETS AND SPACE

巻 58, 号 7, p. 831-841, 発行日 2006
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 1880-5981
DOI
関連識別子 10.1186/BF03351988
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