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《Chinese Journal of Geophysics》 1992-03
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MODELING 2-D TERRAIN EFFECT ON MT BY THE BOUNDARY ELEMENT METHOD

Xu SHI-ZHE(Ocean University of Qingdao, Qingdao 266003) WANG QING-YI WANG JUN(Institute of Minerals and Geology of Beijing, the Head Company of Nonferrous metal industry of China, Beijing100012)  
The boundary element method is used to model 2-D terrain effect on magnetotelluric field in this paper. First, the boundary value problem of 2-D magnetotelluric field is transformed into integral equation problems by use of Green's theorem. Then, the boundary element method is used to solve the integral equation and to get the magnetotelluric field and its normal derivative on the terrain. From these values, we can calculate the apparent resistivity caused by the terrain.The results calculated by this method are compared with those calculated by finite element method and by analytic method. The agreement is satisfactory.Compared with the finite element method, the boundary element method is simpler in element division and initial data preparation and requires less memory space. The configuration of terrain divided by the boundary element method is more consistent with the practical terrain. The method proposed in this paper can be run on a microcomputer. Therefore, the 2-D terrain correction for MT can become an applicable technique for field practice.The calculation results show that: in the case of Hx-polarization, the terrain effect is much severer than that in Ex-polarization, and it becomes stable as the period increases.
【Fund】: 国家自然科学基金
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