| A Preliminary Study on the New Activity Features of the Lajishan Mountain Fault Zone in Qinghai Province |
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| 作者姓名： | Yuan Daoyang |
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| 作者单位： | Yuan Daoyang 1，2)，Zhang Peizhen 2)，Lei Zhongsheng 1)，Liu Baichi 1) and Liu Xiaolong 1) 1) Lanzhou Base of Institute of Earthquake Prediction，CEA，Lanzhou 730000，China 2) Institute of Geology，China Earthquake Administration，Beijing 100029，China |
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| 基金项目： | This study was sponsored by National Natural Sciences Foundation of China （Project Number 40372086）, the key projects of National Natural Sciences Foundation of China （No.40234040）, and Joint Earthquake Science Foundation, CEA （No. 102055）. Contribution number： LC2004009 of lanzhou Base of Institute of Earthquake Prediction, CEA. |
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| 摘 要： | INTRODUCTIONThe Lajishan Mountainlies onthe northeastern margin of Qinghai_Xizang(Tibet)plateau.It is ageomorphic gradient zone,separatingthe hinterland of Tibetfromthe Loess plateau.The Lajishanfaultis a product of Caledonian movement,havingexperienced m…
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| 关 键 词： | 青海 地震 活动性 区域划分 地质条件 |
| 收稿时间： | 2003-11-19 |
| 修稿时间： | 2004-05-21 |
A Preliminary Study on the New Activity Features of the Lajishan Mountain Fault Zone in Qinghai Province |
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| Yuan Daoyang.A Preliminary Study on the New Activity Features of the Lajishan Mountain Fault Zone in Qinghai Province[J].Earthquake Research in China,2005,19(4):391-401. |
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| Authors: | Yuan Daoyang |
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| Institution: | Lanzhou Base of Institute of Earthquake Prediction, CEA, Lanzhou 730000, China;Institute of Geology, China Earthquake Administration, Beijing 100029, China |
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| Abstract: | The Lajishan Mountain fault zone consists of two NE_protruding arcuate faults, i.e. the northern and southern margin fault of Lajishan Mountain with the fault length of 230km and 220km respectively. The fault zone is located in the large_scale compressional structure zone and tectonic gradient zone in_between the NNW_trending right_lateral strike_slip Reshui_Riyueshan fault zone and the NWW_trending left_lateral strike_slip northern margin of west Qinling Ranges fault zone is also an important boundary fault zone, separating the Xining_Minhe basin and the Xunhua_Hualong basin at the southern and northern sides of the Lajishan Mountain respectively. Geologic geomorphic evidences of new activity revealed by field investigations indicate that the latest movement of the Lajishan fault zone was in late Epipleistocene (only a few segments were active in early Holocene) and is mainly of compressive thrusting with slightly left_lateral strike_slip component. The above movement has possibly resulted in the occurrence of about 20 moderate earthquakes of magnitude around 5.0. The Lajishan region can therefore be regarded as a seismotectonic window to reflect tectonic movement and earthquake activity. |
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| Keywords: | Lajishan Mountain Active fault Historical earthquake New activity |
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