The detection of tombs inside tumuli is an especially challenging geophysical problem. Geoelectrical methods by means of 3D inversion are increasingly popular for tumuli investigation. Typically data are obtained by establishing a regular grid and by assembling the data collected by parallel two-dimensional (2D) tomographies. In this work we extended the study into the application of radial 3D mode which is considered as the assembly of data collected by radially positioned ERT lines. We investigate the relative advantages and disadvantages of this measuring mode over the regular grid measurements and we propose optimum ways to perform 3D ERT surveys for tumuli investigations. Comparative test were performed by means of synthetic examples as well as by tests with field data. Overall all tested models verified the superiority of the radial mode in delineating bodies positioned at the central part of the tumulus while regular measuring mode proved superior in recovering bodies positioned away for the center of the tumulus. The combined use of radial and regular mode seems to produce superior results.


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