Local stress concentration in the seismic belt along the Japan Sea coast inferred from precise focal mechanisms: Implications for the stress accumulation process on intraplate earthquake faults
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- Rie Kawanishi
- Research Center for Earthquake Prediction, Disaster Prevention Research Institute Kyoto University Gokasho Uji Japan
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- Yoshihisa Iio
- Research Center for Earthquake Prediction, Disaster Prevention Research Institute Kyoto University Gokasho Uji Japan
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- Yohei Yukutake
- National Research Institute for Earth Science and Disaster Prevention Tsukuba, Ibaragi Japan
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- Takuo Shibutani
- Research Center for Earthquake Prediction, Disaster Prevention Research Institute Kyoto University Gokasho Uji Japan
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- Hiroshi Katao
- Research Center for Earthquake Prediction, Disaster Prevention Research Institute Kyoto University Gokasho Uji Japan
書誌事項
- 公開日
- 2009-01
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/2008jb005765
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:p>Spatial changes in the azimuth of the maximum principal stress (<jats:italic>σ</jats:italic><jats:sub>1</jats:sub>) axis are found in the intraplate region of southwest Japan. It is inferred from stress inversions of numerous precise focal mechanisms that the azimuths of the <jats:italic>σ</jats:italic><jats:sub>1</jats:sub> axis in the seismic belt along the Japan Sea coast are oriented in N110°E–N130°E directions, while in the surrounding region they are aligned in almost the EW direction, N90°E–N100°E. Maximum horizontal compressional stresses in an EW direction are widely observed in the shallow crust in the inland plate along the Nankai Trough. However, the maximum horizontal stress in a WNW–ESE direction is seen only in the seismic belt. This spatial change in the stress field in and around the seismic belt is explained by the deformation of an aseismic fault or a ductile fault zone in the lower crust beneath the seismic belt.</jats:p>
収録刊行物
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- Journal of Geophysical Research: Solid Earth
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Journal of Geophysical Research: Solid Earth 114 (B1), B01309-, 2009-01
American Geophysical Union (AGU)
