Electrical resistivity tomography investigations in the Ufita Valley (Southern Italy)

Several Electrical Resistivity Tomography (ERT) surveys have been carried out to study the subsurface structural and sedimentary setting of the upper Ufita River Valley, and to evaluate their efficiency to distinguish the geological boundary between shallow Quaternary sedimentary deposits and clayey bedrock characterized by moderate resistivity contrast. Five shallow ERT were carried out across a morphological scarp running at the foot of the northeastern slope of the valley. This valley shoulder is characterized by a set of triangular facets, that some authors associated with the presence of a SW-dipping normal fault. The geological studies allow us to interpret the shallow ERT results obtaining a resistivity range for each Quaternary sedimentary deposit. The electrical images showed the geometrical relationships of alluvial and slope deposits, having a maximum thickness of 30-40 m, and the morphology of the bedrock. The resistivity range, obtained for each sedimentary body, has been used to calibrate the tomographic results of one 3560 m long deep ERT carried out across the deeper part of the intramountain depression with an investigation depth of about 170 m. The deep ERT highlighted the complex alluvial setting, characterized by alternating fine grained lacustrine deposits and coarser gravelly fluvial sediments