The objective in the two-dimensional (2-D) inversion of de apparent resistivity data is to determine the true subsurface resistivity distribution over any arbitrarily shaped 2-D structure. To do this successfuliy, it is essential that a good inversion scheme be able to simultaneously minimize the data rms misfit and the model rms misfit. With field data the true model is rarely, if ever, known precisely. Through model studies, such as is presented here, where the true solutions are known, realistic and assessment of the robustness of the inversion can be accomplished. The models investigated, for the Wenner array, include horizontal layering, fault, low and high resistivity fills, localised inhomogeneities, as well as the influence of noise contamination.


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