| Kinematical and Structural Patterns of the Yingjing-Mabian- Yanjin Thrust Fault Zone, Southeast of the Qinghai-Xizang （Tibet） Plateau and Its Segmentation from Earthquakes |
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| 作者姓名： | Zhang Shimin |
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| 作者单位： | Zhang Shimin~ 1)，Nie Gaohong~ 2)，Liu Xudong~ 1)，Ren Junjie~ 1) and Su Gang~ 1) 1) Institute of Crustal Dynamics，China Earthquake Administration，Beijing 100085，China 2) Institute of Geology，China Earthquake Administration，Beijing 100029，China |
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| 基金项目： | The research was sponsored bythe keyresearch project entitled“Seismic Safety Evaluation and Structural Earthquake Resistance”under the 10th Five-Year Program of the ChinaEarthquake Administration，the Joint Earthquake Science Foundation of China (0101302)，Contribution number :2005A001 ,the Institute of Crustal Dynamics ,CEA. |
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| 摘 要： | INTRODUCTIONThe Yingjing-Mabian-Yanjinthrust fault zone lies on the southeastern margin of Tibet .It startsfromthe south of Tianquaninthe north,and it extends southwards through Yingjing, Emei , Ebian,Mabian,Lidian to the north of Yanjin of Yunnan, with a total length of 275 km. The fault zoneintersects withthe southernsegment of the Longmengshanthrust fault zone onits northernsegment andborders the Huayingshan-Lianfengfault zone onits southernsegment .It is a 30 km-wide NW-trendin…
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| 关 键 词： | 冲断层 横断层 纵向断层 分节运动 地震 青藏高原 |
| 收稿时间： | 2004-10-09 |
| 修稿时间： | 2005-01-06 |
Kinematical and Structural Patterns of the Yingjing-Mabian-Yanjin Thrust Fault Zone,Southeast of the Qinghai-Xizang (Tibet) Plateau and Its Segmentation from Earthquakes |
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| Zhang Shimin.Kinematical and Structural Patterns of the Yingjing-Mabian-Yanjin Thrust Fault Zone,Southeast of the Qinghai-Xizang (Tibet) Plateau and Its Segmentation from Earthquakes[J].Earthquake Research in China,2006,20(2):202-215. |
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| Authors: | Zhang Shimin |
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| Institution: | Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China |
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| Abstract: | Segmentation of the thrust fault zone is a basic problem for earthquake hazard evaluation. The Yingjing-Mabian-Yanjin thrust fault zone is an important seismic belt NW-trending in the southeast margin of the Qinghai-Xizang (Tibet) plateau. The longitudinal faults in the thrust zone are mainly of the thrust slipping type. The late Quaternary motion modes and displacement rates are quite different from north to south. Investigation on valleys across the fault shows that the transverse faults are mainly of dextral strike-slipping type with a bit dip displacement. Based on their connections with the longitudinal faults, three types of transverse faults are generalized, namely: the separate fault, the transform fault and the tear fault, and their functions in the segmentation of the thrust fault zone are compared. As the result, the Yingjing-Mabian-Yanjin thrust fault zone is divided into three segments, and earthquakes occurring in these three segments are compared. The tri-section of the Yingjing-Mabian-Yanjin thrust fault zone identified by transverse fault types reflects, on the one hand, the differences in slip rate, earthquake magnitude and pace from each segment, and the coherence of earthquake rupturing pace on the other hand. It demonstrates that the transverse faults control the segmentation to a certain degree, and each type of the transverse faults plays a different role. |
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| Keywords: | Thrust fault zone Transverse fault Longitudinal fault Fault segmentation Terrace phase map |
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