Target Detectability Depths of DC Arrays for Various Models

We have compared target detectability depths for six different DC geoelectric arrays. Five various 2D inhomogeneity models and two noise levels (5 pc and 10 pc) were assumed. The maximum detectability depths were determined by using the RES2DMOD software. Although the results are model-dependent (they depend both on geometry and resistivity contrast), the best results (namely: the maximum detectability depths) were obtained usually with the pole-dipole (P-DP) and the dipole axial (DP-ax) arrays. The worst results (namely: the smallest detectability depths) were obtained (with one exception) in case of the pole-pole (P-P) and the Wenner-alfa (W-alfa) arrays. The results by using the Wenner-beta (W-beta) and dipole equatorial (DP-eq) array groups are slightly below or above the average. Detectability depth values are comparable exclusively for the same model (partly due to the variable resistivity contrast), but in case of a certain model it can be unambiguously declared, which array is the most effective one.