Determination of three-layer earth model from Wenner four-probe test data

Based on the solution of the electric field inverse problem, an efficient method for determining three-layer earth models and parameters from Wenner's four-probe test data is presented, i.e., from a set of voltage values measured on the earth surface due to the current injected into the earth. The speed of the iterative convergence is increased by employing the generalized inverse algorithm for solving the relevant nonlinear system of equations, and using a suitable method for determining initial values for the iterative process. The earth structure is the field model for simulating grounding electrodes or grounding grids of substations. The determination of the structure is essential in the simulation and the design of grounding grids.