龙门山构造带中段大地电磁测深研究  

A STUDY OF MAGNETOTELLURIC SOUNDING IN THE MIDDLE SEGMENT OF THE LONGMENSHAM STRUCTURAL BELT

作　　者：张振宇[1] 王绪本[2] 方慧[1] 

机构地区：[1]中国地质科学院地球物理地球化学勘察研究所,河北廊坊065000 [2]成都理工大学地球物理学院,四川成都610059

出　　处：《物探与化探》2012年第3期377-381,共5页Geophysical and Geochemical Exploration

摘　　要：采用加拿大凤凰公司生产的多功能电法仪V8在龙门山构造带中段进行大地电磁测深研究,采用先进的资料处理与解释技术对龙门山中段大地电磁(MT)剖面资料进行了分析,同时运用大地电磁测深法定性分析方法(Mohr圆分析、极化图分析)对剖面进行了分析,得到一致的结论:剖面整体表现二维性,而在断裂分段区域各向异性程度和三维性较强。最后推断5.12汶川8级大地震震源位置在映秀断裂的下盘。With multifunction instrument V8 generated by Phoenix Company in Canada,the authors carried out magnetotelluric sounding study in the middle section of Longmenshan structural belt,and used advanced data processing and interpretation of electromagnetic technology to analyze magnetotelluric sounding（MT） profile data.At the same time,the profile was analyzed by the qualitative analysis method（Mohr circle analysis,polarization diagram analysis） and the interpretation of magnetotelluric sounding.It is concluded that the overall performance of the profile is two-dimensional,and the anisotropy and three-dimensional nature are relatively strong in the fracture sub-region.It is also inferred that the source location of the Wenchuan Magnetude-8 Earthquake that occurred in May 12,2008 was in the footfall of Yinxiu fault.

关 键 词：龙门山构造带 大地电磁测深 电性结构 汶川地震 

分 类 号：P631[天文地球—地质矿产勘探]