The resistivity-based high-density prospecting (RHP) becomes to widely use in the field of geotechnical engineering, to understand geologic formation, positions of fault fractures and altered zones, distribution condition of ground water and so on. The fault fractures and altered zones usually exist as thin structures in ground. In this paper, to get basic information of RHP to evaluate above-mentioned thin structures, the prospecting characteristics were experimentally investigated by such four kinds of electrode arrays as Dipole-dipole, Wenner, Pole-pole and Pole-dipole arrays, through field tests on an embankment with a buried vertical thin structure. As the results, it was elucidated that some symmetrical contrast on the resistivity distribution corresponding to the thin structure was recognized in four kinds of electrode arrays, and that the contrast becomes clearer in the distribution of the changing ratio between cases with and without thin structure. Also, some findings on the prospecting characteristics for thin structures in the ground were pointed out.
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