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In recent decades, the magnetotelluric (MT) method has been applied widely to geotectonics, oil and gas surveys, geothermal investigations, and earthquake prediction. Forward modeling for the 1-D MT problem is analytical. However, for the 2-D case one must use numerical methods. Presently, the most commonly used numerical method is the FEM (Silvester and Haslam, 1972; Reddy and Rakin, 1975; Xu and Zhao, 1985; Wannamaker et al., 1986, 1987; and Chouteau and Bouchard, 1988).

This chapter presents the application of the BEM to 2-D MT forward modeling. The BEM is most useful if there exists a single in-homogeneous body underground (Xu and Zhao, 1987) and, more importantly, for the study of 2-D and 3-D terrain effects on the MT field (Xu and Zhou, 1997; Xu et al., 1997). When the geological structure is complex, the FEM is obviously superior to the BEM

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