Marquardt's maximum neighborhood method for computing the values of nonlinear parameters is applied to model magnetotelluric data to compute conductivity contrast, overburden thickness, and the depth extent of a conductor.The problems treated are two-dimensional and the network solution is used to formulate the relationship between the EM fields and the nonlinear parameters.The method appears to work much better than trial-and-error or master-curve matching techniques. Its application to any particular magnetotelluric problem appears to be limited only by one's experience and imagination.

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