The Crust-Mantle Structure in Zhangbei-Shangyi Earthquake Area |
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| Authors: | Zhu Zhiping Zhang Jianshi Zhang Xiankang Zhang Chengke Liu Mingqing and Nie WenyingResearch Center of Exploration Geophysics CSB Zhengzhou China |
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| Institution: | Zhu Zhiping,Zhang Jianshi,Zhang Xiankang,Zhang Chengke,Liu Mingqing,and Nie WenyingResearch Center of Exploration Geophysics,CSB,Zhengzhou 450002,China |
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| 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. |
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| Keywords: | Zhangbei and adjacent area crust-upper mantle velocity structure deep crustal fault wide angle reflection and refraction |
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