大地电磁二维对称各向异性介质的有限元数值模拟  

MT NUMERICAL SIMULATION OF SYMMETRICALLY 2 D ANISOTROPIC MEDIA BASED ON THE FINITE ELEMENT METHOD

作　　者：杨长福[1] 

机构地区：[1]国家地震局兰州地震研究所

出　　处：《西北地震学报》1997年第2期27-33,共7页Northwestern Seismological Journal

摘　　要：假定垂直轴为二维对称各向异性介质主轴之一，构造走向与另一主轴方向成任一夹角，用伽勒金（Ｇａｌｅｒｋｉｎ）有限元法和矩形网格，优化地合成总体刚度矩阵，使二维各向异性介质的基本方程形成有限元代数方程组，求出各节点场值，并利用ＭＯＭ法求出辅助场，进而求出张量阻抗等响应函数．In this paper,the vertical axis is treated as one of the principal axes of the two dimensional, symmetric, anisotropic media ,in which the structure strike is an arbitrary included angle with respect to another principal axis. In this condition , the entire region is divided into rectangular elements.For the basic equations of the two dimensional anisotropic media,a total stiffness matrix is composed reasonably, so the coupled finite element equations can be formed byusing Galerkin's finite element method.By solving these equations for the fieldcomponents at each node and on the basis of MOM method ,author evaluates the auxiliary field components on the earth's surface and obtains MT responses such as tensor impedances and so on. In addition, a numerical calculation test for the model which was used in the related reference is carried out.

关 键 词：大地电磁测深 各向异性介质 有限元 数值模拟 

分 类 号：P631.322[天文地球—地质矿产勘探] P631.325[天文地球—地质学]