电导率分块连续变化的二维MT有限元模拟（Ⅱ）

THE FINITE ELEMENT METHOD FOR MODELING 2-D MT FIELD ON A GEOELECTRICAL MODEL WITH CONTINUOUS VARIATION OF CONDUCTIVITY WITHIN EACH BLOCK

用有限单元法进行电导率分块连续变化的二维大地电磁场的模拟，本文的第一部分给出有限单元法系数矩阵的计算公式，这部分给出四个模型的计算结果。在有限元中，分别采用双线性插值和双二次插值。计算结果与解析法或有限差分法进行对比，吻合得很好。算例表明，本方法具有计算精度高、网格剖分简单。

The finite element method is used for modeling 2-D MT field on a geoelectrical model with continuous variation of conductivity within each block.In the first part of this paper,the calculating formulae of coefficient matrixes in FEM were given.This second part gives the results of calculation for four models.In the FEM,the bi-linear and bi-guadratic interpolations are used respectively.The results of calculation by the FEM are compared with those by the analytic method or the finite difference method,which coincide well each other.The calculation examples show that this method has merits as high accuracy,simple net division and precise simulation.