摘要
在二维地电模型中,考虑到大地电磁(MT)的倾子响应依赖于TE极化模式的数值模拟问题,采用有限差分法对倾子响应进行了数值近似计算。首先,从电场满足的边值问题出发,利用有限差分法导出了TE极化模式下MT二维正演计算的线性方程组;其次,编写了计算MT二维倾子响应的Matlab程序,同时模拟计算了一维介质模型的大地电磁响应,验证了倾子响应差分正演算法的正确性;最后,通过对典型二维地电模型的MT倾子响应模拟,获得了倾子响应的实部、虚部和振幅,其结果都较好地反映了不均匀体的横向分布情况,这能为实测数据的定性解释提供指导。
In the two-dimensional geo-electric model,the tilting response of magnetotelluric（MT）depends on the numerical simulation of the TE mode,so the finite difference method is used to calculate the tilting response in this paper.Firstly,from the boundary value problem of electric field,the linear equations for MT two-dimensional forward calculation in TE polarization mode is derived by finite difference method.Secondly,the Matlab program for MT two-dimensional tilting responses is programmed.Meanwhile,theMT response of one-dimensional medium model is simulated and the correctness of the differential forward algorithm for tilting response is verified.Lastly,by the numerical simulation for the two-dimensional model,the tilting responses are obtained including real part,imaginary part and amplitude,and the results can reflect the horizontal distribution of heterogeneous body,which can provide guidance for qualitative interpretation of field data.
作者
童孝忠
吴思洋
谢维
Tong Xiaozhong;Wu SiyangI;Xie Wei(School of C_reosciences and In f o--physics,Central South University,Changsha Hunan 410083,China;Hunan Key Laboratory of Non--ferrous Resourcs and Geological Hazard Exploration,Central South University,Changsha Hunan 410083,China)
出处
《工程地球物理学报》
2018年第4期485-491,共7页
Chinese Journal of Engineering Geophysics
基金
国家自然科学基金(编号:41604111)
国家级大学生创新创业训练计划项目(编号:201710533236)
关键词
大地电磁
二维模型
倾子响应
有限差分法
magnetotelluric/MT
two-dimensional model
tilting response
finite difference method
