DEEP STRUCTURE BACKGROUND OF 1966 XINGTAI M6.8 EARTHQUAKE
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摘要: 根据"八五"期间邢台地震区深部地球物理方法的综合探测研究成果,依据P波、S波联合解释和二维密度反演,并结合浅部构造和三维应力场数值模拟计算等资料,进行综合分析研究。以1966年邢台6.8级地震为例,揭示了邢台地震区的孕震发震过程。邢台地震区的深部结构和介质结构:①中、下地壳内分布有北东向高角度深断裂,深断裂两侧出现明显的波速比异常。②中地壳有低速高导层和密度不均匀异常。③上地壳底部有滑脱构造带,浅部为束鹿断凹。Abstract: Based on the eighth Five-Year-Plan period research results of composite geophysical deep sounding in Xingtai seismic area, the interpretation of Pwave and S wave, 2-D density inversion, shallow structures and 3-D numerical simulation of stress field are combined to research comprehensively, and the seismogenic process of Xingtai seismic area is revealed with the example of 1966 Xingtai M 6.8 earthquake. In Xingtai seismic area, the deep structure and media feature are as follows:①There are high angle deep-seated faults in NE direction in the middle and lower crust and there is an apparent anomaly of Vp/Va ratio in both sides of the deep-seated faults. ②There are low velocity and high conduction layer and the heterogenous anomaly of density in the middle crust. ③There are decollement structures in the bottom of the upper crust and Shulu fault depression is in the shallow.
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Key words:
- Vp/Va ratio /
- Decollement structure /
- Deep-seated fault /
- 2-D density inversion /
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2 王椿.,张先康,吴庆举,祝治平.华北盆地滑脱构造的地震学证据.地球物理学报, 1994. 37 (5):613-620
3 A. S.Aekseev,A. V. Etrorlrin,N.L. Pavlenkove. 基于苏联搅内岩石层研究的剪切波.地球物理学进展(刘建华译)1989,4 (3),80-91 -

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