The second array will cover more of the shallow subsurface information. The first mentioned array will provide deep information. Four ‘L’-arrays and four ‘Corner’-arrays are employed in a square geometry that allows surrounding the studied target to cover the subsurface. Apparent resistivity is obtained from ‘L’- and ‘Corner’-shaped profiles, where alternations between current and potential electrodes are carried out in an automatic way. Such a procedure allows acquiring information beneath a construction by simply surrounding the structure of interest by a series of electric resistivity tomography profiles. This paper proposes applying any fourelectrode configuration to provide subsurface information in complex urban areas. Three-dimensional electric resistivity tomography surveys carried out on heavily urbanized areas represent a cumbersome task since buildings, houses, or other types of obstacles do not allow parallel electric resistivity tomography lines to be deployed.
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