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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。
Considering that the deep crustal tectonics is an important deep environmental and mechanical condition for the occurrence of earthquakes, this paper uses the existing shallow geologic and geophysical data to calculate the depth and depth of the crust Fluctuating deep gravity anomaly plane distribution. In this paper, through deep analysis of the distribution characteristics of deep gravitational field in Tangshan, Sanhe, Xingtai, Heze and Huaxian regions and their comparison with the vertical and horizontal deformation fields in the present day, the paper gives the deep sign of potential hypocenters. This paper presents a deep tectonic model that characterizes this feature and unifies the interpretation of the earth structures such as “faulted basins”, “seismic belts”, “seismic layers”, “low-velocity layers” and “high-conductivity layers” The physical process.