## Which Geoelectric Array Sees the Deepest in Noisy Environment? Depth of Detectability Values of Multielectrode Systems over Various TwoDimensional Models

The two dominating difficulties of any geophysical measurement in the urban setting are as follows : ( 1) the area available for measurement is small, so the geoelectric layout length is also small; (2) the noise level is high, and the noise reduces the maximum depth from which any subsurface target can be detected. From the results of two-dimensional numerical model computations assuming multielectrode (electrical resistivity tomography) measurements, we determined the depth of detectability values ( i.e. maximum depth values at which still useful information about a given inhomogeneity is obtained at a given noise level). We conducted detectability studies in detail for six different geoelectric arrays, assuming different noise levels. The depth of detectability is both array-and model-dependent, as it has been found. Therefore, it is recommended to pick an array in a field study that has the greatest possible depth of detectability values for the given model. At the noise level given. If there is no a priori assumption about the subsurface model, we suggest either the pole-dipole (P-DP) array or the dipole axial (DP-ax) array as a default option, because they have the largest detectability values for most models we have studied. A double increase in the level of noise can lead to a decrease of approximately two in the detectability depth itself.

Author (s) Details

**Sándor Szalai**

1CSFK GGI, H-9401 Sopron POB 5, Hungary and Department of Geophysics, University of Miskolc, H-3515 MiskolcEgyetemváros, Hungary.

**Mátyás Krisztián Baracza**

3Research Institute of Applied Earth Sciences, University of Miskolc, H-3515 Miskolc-Egyetemváros, Hungary.

**Attila Novák****
**CSFK GGI, H-9401 Sopron POB 5, Hungary.

**László Szarka
**CSFK GGI, H-9401 Sopron POB 5, Hungary.

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depth of detectability depth of detection depth of investigation Geoelectric array multielectrode systems noise