| Study on Crustal Structure in Haiyuan Strong Earthquake Region |
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| 作者姓名： | Li Songlin Zhang Xiankang Zhang Chengke Ren Qingfang Shi Jinhu Zhao Jinren Fang Shengming Liu Baofeng Pan Suzhen Zhang Jianshi |
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| 作者单位： | Li Songlin，Zhang Xiankang，Zhang Chengke，Ren Qingfang，Shi Jinhu，Zhao Jinren，Fang Shengming，Liu Baofeng，Pan Suzhen，and Zhang Jianshi Research Center of Exploration Geophysics，CSB，Zhengzhou 450002，China |
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| 基金项目： | the State Key Project(95-13-02-02),China．Contribution No．200012,the Research Center of Exploration Geophysics,CSB． |
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| 摘 要： | INTRODUCTIONXIJI－Halyuan－Zhon驯el region Is a well－known eaythquake－prone one In China．From 876 to1989,IOrty－five earthquakes with M。34．7 occurred In and around the。glon(Ma Xingyuan,et al,1989)．Seismic activity In this area Is evidently cha。cterized by large matlnltude and high frequency．The 1920 Haiyuan earthquake(M＝8．5)happened nght In this region,which caused a seriousdisaster and had a wide－ranging effect seldom seen worldwide．For the years,lots of…
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Study on Crustal Structure in Haiyuan Strong Earthquake Region |
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| Li Songlin,Zhang Xiankang,Zhang Chengke,Ren Qingfang,Shi Jinhu,Zhao Jinren,Fang Shengming,Liu Baofeng,Pan Suzhen,Zhang Jianshi.Study on Crustal Structure in Haiyuan Strong Earthquake Region[J].Earthquake Research in China,2001,15(3):230-238. |
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| Authors: | Li Songlin Zhang Xiankang Zhang Chengke Ren Qingfang Shi Jinhu Zhao Jinren Fang Shengming Liu Baofeng Pan Suzhen and Zhang Jianshi |
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| Institution: | Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China |
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| Abstract: | The crust/upper-mantle velocity structure and deep tectonic features are obtained in Haiyuan M = 8.5 earthquake region from data processing of Xiji-Zhongwei deep seismic sounding (DSS) profile. The result shows that there is a great difference between the velocity structures on the two sides of the epicenter. The crust consists of alternative high and low velocity layers on the southern side while on the northern side it consists of a series of layers with positive velocity gradient. There exists a deep fault cutting Moho or an anomalous deep structural zone in the epicentral region. |
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| Keywords: | Haiyuan earthquake Crustal structure Deep crustal fault Anomalous structural zone |
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