| Lateral Inhomogeneity of Basement Layer in Three Gorges Region of Changjiang River (Yangtze River) |
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| 引用本文： | Bian Yinju,Hu Hongxiang,and Gao ShiyuInstitute of Geophysics,SSB,Beijing 100081,China. Lateral Inhomogeneity of Basement Layer in Three Gorges Region of Changjiang River (Yangtze River)[J]. 中国地震研究, 1997, 0(4) |
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| 作者姓名： | Bian Yinju Hu Hongxiang and Gao ShiyuInstitute of Geophysics SSB Beijing 100081 China |
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| 作者单位： | Bian Yinju，Hu Hongxiang，and Gao ShiyuInstitute of Geophysics，SSB，Beijing 100081，China |
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| 基金项目： | This project was sponsored by the Joint Earthquake Science Foundation (93084), China. Contribution No. 96A0095, Institute of Geophysics, SSB, China |
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| 摘 要： | Seismic tomography from the Pg wave data along the non-longitudinal profile in the Three Gorges Region is presented in this paper.The seismic tomography method,and the acquisition and analysis of seismic travel time are broadly outlined.The tomography of basement reveals a great amount of significant information and shows that the low-velocity zone is due to the lithologic difference and the fault fracture zone.It also demonstrates that there exist three high-velocity zones with v>6.4 km/s at the basement; the largest of zones which strikes north-south is located at the southwestern side of Huangling Anticlinorium and extends into the anticlinorium northward.The other two high-velocity zones are,respectively,situated at the eastern side of the anticlinorium and the western side of the profile.The high-velocity zones are inferred to originate from the upwelling of material with high-velocity from deep crust.
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Lateral Inhomogeneity of Basement Layer in Three Gorges Region of Changjiang River (Yangtze River) |
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| Bian Yinju,Hu Hongxiang,and Gao ShiyuInstitute of Geophysics,SSB,Beijing ,China. Lateral Inhomogeneity of Basement Layer in Three Gorges Region of Changjiang River (Yangtze River)[J]. Earthquake Research in China, 1997, 0(4) |
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| Authors: | Bian Yinju Hu Hongxiang and Gao ShiyuInstitute of Geophysics SSB Beijing China |
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| Affiliation: | Bian Yinju,Hu Hongxiang,and Gao ShiyuInstitute of Geophysics,SSB,Beijing 100081,China |
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| Abstract: | Seismic tomography from the Pg wave data along the non-longitudinal profile in the Three Gorges Region is presented in this paper.The seismic tomography method,and the acquisition and analysis of seismic travel time are broadly outlined.The tomography of basement reveals a great amount of significant information and shows that the low-velocity zone is due to the lithologic difference and the fault fracture zone.It also demonstrates that there exist three high-velocity zones with v>6.4 km/s at the basement; the largest of zones which strikes north-south is located at the southwestern side of Huangling Anticlinorium and extends into the anticlinorium northward.The other two high-velocity zones are,respectively,situated at the eastern side of the anticlinorium and the western side of the profile.The high-velocity zones are inferred to originate from the upwelling of material with high-velocity from deep crust. |
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| Keywords: | Three Gorges region seismic tomography basement layer Huangling anti-clinorium. |
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