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The Crust-Mantle Structure in Zhangbei-Shangyi Earthquake Area
作者姓名:Zhu Zhiping  Zhang Jianshi  Zhang Xiankang  Zhang Chengke  Liu Mingqing  and Nie WenyingResearch Center of Exploration Geophysics  CSB  Zhengzhou  China
作者单位:Zhu Zhiping,Zhang Jianshi,Zhang Xiankang,Zhang Chengke,Liu Mingqing,and Nie WenyingResearch Center of Exploration Geophysics,CSB,Zhengzhou 450002,China
基金项目:This project was sponsored by the State Science and Technology Commission of China (No. 85907020301),the United Earthquake Science Foundation of China (No. 196122). Contribution No.RCEG98003,Research Center of Exploration Geophysics, China Seismologica
摘    要:The seismic data obtained from the wide angle reflection and refraction profiles that pass through Zhangjiakou area of Hebei Province were interpreted. Some conclusions drawn from the result are as follows: (1) The nearly EW-trending Zhangbei-Chongli crustal fault zone and WNW-trending Zhangjiakou-Bohai Sea deep crustal fault zone meet in the Zhangbei earthquake (Ms = 6.2) area; (2) At the intersection, the two deep crustal fault zones that stretch to the Moho and the discontinuities of interfaces within the crust form the path for large area basalt eruption in Hannuoba; (3) In the earthquake area, the local velocity reversal in the middle-upper crust and abnormal low velocity zone in the lower crust imply that the magmatic activity there is still fairly violent; and (4) The recent activity of Zhangjiakou-Bohai Sea deep crustal fault zone may be the main cause of the Zhangbei earthquake.


The Crust-Mantle Structure in Zhangbei-Shangyi Earthquake Area
Zhu Zhiping,Zhang Jianshi,Zhang Xiankang,Zhang Chengke,Liu Mingqing,and Nie WenyingResearch Center of Exploration Geophysics,CSB,Zhengzhou ,China.The Crust-Mantle Structure in Zhangbei-Shangyi Earthquake Area[J].Earthquake Research in China,1999(4).
Authors:Zhu Zhiping  Zhang Jianshi  Zhang Xiankang  Zhang Chengke  Liu Mingqing  and Nie WenyingResearch Center of Exploration Geophysics  CSB  Zhengzhou  China
Affiliation:Zhu Zhiping,Zhang Jianshi,Zhang Xiankang,Zhang Chengke,Liu Mingqing,and Nie WenyingResearch Center of Exploration Geophysics,CSB,Zhengzhou 450002,China
Abstract:The seismic data obtained from the wide angle reflection and refraction profiles that pass through Zhangjiakou area of Hebei Province were interpreted. Some conclusions drawn from the result are as follows: (1) The nearly EW-trending Zhangbei-Chongli crustal fault zone and WNW-trending Zhangjiakou-Bohai Sea deep crustal fault zone meet in the Zhangbei earthquake (Ms = 6.2) area; (2) At the intersection, the two deep crustal fault zones that stretch to the Moho and the discontinuities of interfaces within the crust form the path for large area basalt eruption in Hannuoba; (3) In the earthquake area, the local velocity reversal in the middle-upper crust and abnormal low velocity zone in the lower crust imply that the magmatic activity there is still fairly violent; and (4) The recent activity of Zhangjiakou-Bohai Sea deep crustal fault zone may be the main cause of the Zhangbei earthquake.
Keywords:Zhangbei and adjacent area  crust-upper mantle velocity structure  deep crustal fault  wide angle reflection and refraction  
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