In order to solve the contradiction between simulation accuracy and computational efficiency in finite difference magnetotelluric forward modeling,the non-uniform grid finite difference method is used to calculate the magnetotelluric response.Based on the two-dimensional magnetotelluric equation,the difference scheme of TM polarization mode magnetotelluric equation under non-uniform grid subdivision is derived.The correctness of the non-uniform grid difference algorithm is verified by the forward simulation of the uniform half-space model and the low resistance anomaly model.The non-uniform grid difference algorithm can accurately reflect the magnetotelluric response characteristics of the complex model and identify the distribution range of the anomaly body.
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