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。
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.
出处
《华北地震科学》
1997年第2期17-24,共8页
North China Earthquake Sciences
关键词
地震
深部结构背景
震级
滑脱构造
数值模拟
V_p/V_s ratio
Decollement structure
Deep-seated fault
2-D density inversion
