| Study on Active Faults and Seismogenic Structure for the 1989 Batang M6.2 ～ 6.7 Earthquake Swarm in the Litang-Batang Region of West Sichuan, China |
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| 作者姓名： | Zhou Rongjun |
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| 作者单位： | Zhou Rongjun 1)，Chen Guoxing 2)，Li Yong 3)，Zhou Chaohui 1)，Gong Yu 1)，He Yulin 1) Li Xiaogang 1) 1) Earthquake Administration of Sichuan Province，Chengdu 610041，China; 2) Institute for Earthquake Science，China Earthquake Administration，Beijing 100036，China; 3) Chengdu University of Technology，Chengdu 610051，China |
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| 基金项目： | The research was supported by the National Natural Science Foundation （40372054） and the Joint Earthquake Science Foundation （95070425）, CEA. |
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| 摘 要： | INTRODUCTIONGeological investigations since the1970s have shown that the sub_longitudinal Jinshajiang andHonghe(Red River)fault zones constitutethe western boundary of“Rhombic Sichuan_Yunnan Block”onthe Sichuan_Tibet border and display mainly dextral sh…
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| 关 键 词： | 四川 地震 地球构造 地质条件 震级 板块运动 |
| 收稿时间： | 2004-03-08 |
| 修稿时间： | 2004-09-10 |
Study on Active Faults and Seismogenic Structure for the 1989 Batang M6.2 ～ 6.7 Earthquake Swarm in the Litang-Batang Region of West Sichuan, China |
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| Zhou Rongjun.Study on Active Faults and Seismogenic Structure for the 1989 Batang M6.2 ～ 6.7 Earthquake Swarm in the Litang-Batang Region of West Sichuan, China[J].Earthquake Research in China,2005,19(3):292-305. |
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| Authors: | Zhou Rongjun |
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| Institution: | Earthquake Administration of Sichuan Province, Chengdu 610041, China |
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| Abstract: | Fault structures in the Litang-Batang region of West Sichuan are mainly sub-longitudinal and a set of NNE- and NW-trending conjugate shear fracture zones is developed. In this paper, emphasis is put on explaining the movement patterns along the fault structures in the region since the late Pleistocene-Holocene on the basis of detailed interpretation of TM satellite images and aero-photos in geomorphologic aspect of active structures. The sub-latitudinal shortening rate along the sub-longitudinal Jinshajiang fault zone is determined to be 2 - 3mm/a since the late Quaternary, the horizontal dextral slip movement rate along the NNE-trending Batang fault is 1.3 - 2.7mm/a on average, and the horizontal sinistral slip movement rate along the NW-trending Litang fault is 2.6 - 4.4 mm/a on average. The general status of the recent crustal movement in the region and the regularities of block motion caused by it are analyzed in combination with data of geophysical fields, focal mechanism solutions and GPS measurements. The occurrence of the 1989 Batang M6.2 - 6.7 earthquake swarm is suggested to be the result of tensional rupture along the sub-latitudinal normal fault derived from the conjugate shearing along the NNE-trending Batang and the NW-trending Litang faults. It reveals a typical seismic case produced by normal faulting in a compressional tectonic environment. |
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| Keywords: | Active fault Slip movement rate Block motion Earthquake swarm West Sichuan |
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