Abstract
Electrical and magnetotelluric surveys have been performed on the Apulian carbonate platform to study the deep coastal karst aquifer. The surveys extend to a depth of about 7 km, to give a complete hydrogeological understanding of the area. The problems of interpreting regional geophysical data in highly heterogeneous carbonate rocks are extensively analyzed. This study suggests that the aquifer is generally confined at both the top and the bottom by more compact carbonate rocks and has a maximum depth of about 2 km. Also, seawater invasion is both areally and vertically limited. The possibility that dolomite rocks, present in the 2–5 km depth range, could also hold low-salinity waters is discussed. All the hydrogeological features of the investigated area are found to be mainly dependent on the tectonic evolution of the carbonate platform.
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