【摘要】 考虑到地壳深部的构造形态是地震孕育发生的重要深部环境和力学条件,本文利用已有的浅层地质和物探资料,经过重力场的正、反演计算,获得了能够较精确反映地壳深部界面起伏的深部重力异常平面分布。文章通过对唐山、三河、邢台、菏泽和华县等地震区的深部重力场展布特征,及其与现今地面垂直和水平形变场的对比分析,给出了潜在震源区划分的深部标志。文章提出一种表征这种特征的深部构造模式,统一地解释了形成地表“断陷盆地”、“地震带”、壳内“易震层”、低速层”和“高导层”等地球构造的物理过程。更多还原

【Abstract】 Taking account that the tectonic configuration in deep crust is an important deep environment and mechanical conditions for seismic origin and occurrence, in the present paper the plane distribution of deep gravity anomaly, which shows exactly the fluctuation of interface in deeper-crust, has been obtained by normal and inversion methods by making use of the existing data of shallow geology and geophysical exploration. The distribution feature of deep gravity field and its correlations with recent vertical or horizontal deformation on ground in Tangshan, Sanhe, Xingtai, Heze and Huaxian are compared and analysed. Consequently, the deep criteria for division of potential source area are obtained. A model showing this deep tectonics is presented in this paper. The physical process forming "depression-basin" on the surface, "seismic zone" "earthquake-prone layer","lower-velocity layer",and "high-conducting layer" in the intercrust is interpreted.更多还原