| The heterogeneous characteristics of crust-mantle structures and the seismic activities in the northwest Beijing region |
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| 作者姓名： | 赵金仁 张先康 张成科 张建狮 刘宝峰 任青芳 潘素珍 海燕 |
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| 作者单位： | Exploration Geophysics Center，China Earthquake Administration，Zhengzhou 450002，China，Exploration Geophysics Center，China Earthquake Administration，Zhengzhou 450002，China，Exploration Geophysics Center，China Earthquake Administration，Zhengzhou 450002，China，Exploration Geophysics Center，China Earthquake Administration，Zhengzhou 450002，China，Exploration Geophysics Center，China Earthquake Administration，Zhengzhou 450002，China，Exploration Geophysics Center，China Earthquake Administration，Zhengzhou 450002，China，Exploration Geophysics Center，China Earthquake Administration，Zhengzhou 450002，China，Exploration Geophysics Center，China Earthquake Administration，Zhengzhou 450002，China |
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| 基金项目： | National Natural Science Foundation of China (40334040) and Key Project from China Earthquake Administration during the ninth Five-year Plan (9504080101). |
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| 摘 要： | Introduction Zhangjiakou-Bohai seismic zone is a major active seismic zone that passes through the north-ern part of North China. Zhangjiakou-Beijing area, the northwest part of North China, is located at the intersection position of Yanshan, Taihangshan uplift, and Shanxi down-faulted zone, and the geological structures in this area are extremely complicated. Many researchers in the geoscience circle always pay close attention to this region because Yanqing-Huailai region is located in th…
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| 收稿时间： | 17 November 2003 |
| 修稿时间： | 8 October 2004 |
The heterogeneous characteristics of crustmantle structures and the seismic activities in the northwest Beijing region |
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| ZHAO Jin-Ren,ZHANG Xian-kang,ZHANG Cheng-ke,Zhang Jian-shi,LIU Bao-feng,REN Qing-fang,PAN Su-Zhen,Hai Yan.The heterogeneous characteristics of crust-mantle structures and the seismic activities in the northwest Beijing region[J].Acta Seismologica Sinica(English Edition),2005,18(2):125-134. |
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| Authors: | ZHAO Jin-Ren ZHANG Xian-kang ZHANG Cheng-ke Zhang Jian-shi LIU Bao-feng REN Qing-fang PAN Su-Zhen Hai Yan |
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| Institution: | Exploration Geophysics Center, China Earthquake Administration, Zhengzhou 450002, China |
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| Abstract: | In this paper, the abnormal characteristics of the crustal structures in the seismic active region, Yanqing-Huailai and Zhangbei-Shangyi, are obtained by means of comprehensively interpreting and studying the data of deep seis- mic sounding profiles passing through the northwestern part of Zhangjiakou-Bohai seismic zone. The results show that the fluctuation of crystalline basement in the study region is obvious and that there exist considerable differ- ences in depth in different geological units. The locally abrupt variation of crystalline basement depths may be regarded as a mark of existence of crystalline basement faults. These crystalline basement faults and deep crustal faults provide a pass for the magma upwelling, resulting in the strong inhomogeneity of crustal structures. These phenomena of the complex seismic reflected waves and locally discontinuous reflection zones with different en- ergy indicate that the intensive squeeze and deformation of crust took place, which have led to the complex crustal structures and offered the dynamic source for the earthquake occurrence in this region. The low velocity bodies in different depths of crust and the local interface C1 in Zhangbei-Shangyi region may result from repeated magmatic activities. The certain stress accumulation in the brittle upper crust can cause the occurrence of earthquake under the action of local tectonic activity. |
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| Keywords: | northwest Beijing region seismic sounding shallow and deep structures earthquake-generating backgrounds |
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