邢台7.2级地震震源区的电磁阵列剖面法测量与电性特征研究  

THE OBSERVATION OF ELECTROMAGNETIC ARRAY PROFILING AND ELECTRICAL CHARACTERISTICS OF THE CRUCT IN XINGTAI M_S7.2EARTHQUAkE AREA

作　　者：邓前辉[1] 张木生[1] 詹艳 刘国栋[1] 赵国泽[1] 汤吉 

机构地区：[1]国家地震局地质研究所,北京100029

出　　处：《地球物理学报》1998年第2期218-225,共8页Chinese Journal of Geophysics

基　　金：国家"八五"科技攻关项目!85907020103

摘　　要：为了取得邢台地震区地壳细结构，对该区进行了综合地球物理方法探测，其中电磁阵列剖面法（EMAP）测量在我国尚属首次．EMAP剖面穿过邢台7．2级地震区，经过EMAP阻抗求取、空间滤波处理和二维反演解释，剖面显示出清晰的地壳电性细结构特征：4km以上电性简单，4—20km深度电性复杂；震源区电性复杂，非源区简单；发震深度变化复杂；震源区电性突变，显示隐伏高角度断裂，高寻层不连续部位为发震部位．其观测结果对于了解该区的构造背景、发震构造和深部构造的关系有重要意义．Xingtai earthquake of 1966 was located in the Shulu fault basin, which is in thecentral region of North Chian Plain. In order to reveal the fine crustal strUcture in theearthquake area, the synthetic exploration of geophysics was conducted as one of the'85' projects of the country. It is first bine for China to use electromagnetic arrayProfiling (EMAP). The profile crosses through Xingtai Ms7.2 earthquake area. TheEMAP section, after estimating EMAP, impedances, spatial filtering and 2--D invesion,shows clearly the image of the fine crustal structure. The depth from 0 to 4km lookslike simple, while that from 4 to 20km seems to be complex. The focal area is morecomplicated than non--focal area. The range of seismogenic depth is more complicatedthan the other depth range. Sharp changes of the electrical structure of the focal areaindicate the hidden faults with steep angles. The discotinuous position of highconductive layers seems to be seismogenic region. These features are of greatimportance to understand the tectonic background of the studied region, theseismogenic structure, and relahonship between deep and shallow structures.

关 键 词：电磁阵列剖面法 电性结构特征 地震 震源区 

分 类 号：P315.3[天文地球—地震学] P631.325[天文地球—固体地球物理学]