Abstract: In this paper,the basic principles of inversion method for a single magnetic interface in frequency domain are briefly described.The method is used in numerical processing of the aeromagnetic data in Tangshan earthquake area.The quantitative characteristics of the magnetic crystal line basement interface are distinguished.The results show that Tangshan is located in a fold-depression in the northern part of North China plain adjacent to Yanshan uplift.The basal magnetic interface on bottom of Kaiping syncline in the focal zone is a depression which is confined by three deep faults around.Then the preparation and generation process of Tangshan earthquake are discussed in combination with the results of seismic sounding,crustal deformation and crustal stress data.

Key words: Tangshan earthquake area, Aeromagnetic anomaly, Inversion in frequency domain, Magnetic basement interface, Basement fault

摘要： 扼要地叙述了频率域磁性单界面反演方法的基本原理,运用该程序对唐山震区航磁资料进行了数字处理,获得了震区结晶基底磁性界面的定量特征。结果表明唐山处在华北平原北部与燕山隆起毗邻的褶皱拗陷中,震源区开平向斜的底部基底磁质界面为一拗陷,周围受3条深断裂切割围限。文章最后,结合人工地壳测深、地形变、地应力等成果进行了分析研究,探索了唐山地震的发生及孕育过程。

关键词: 唐山地震, 航磁异常, 频率域反演, 基底磁性界面, 基底断裂