GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 - POSTER GNGTS 2023 Fig. 3: Screenshots of the digital photogrammetry model of the outcropping sector of the Dílar fault. In the figure on the left the plane has been digitized. The figure on the right shows recognized lineaments and preliminary structural results. Discussion Of the geophysical techniques tested, preliminary results from gravimetry in combination with passive seismic results have shown the best performance. From the gravimetric results, residual anomaly maps and polynomial derivative maps were obtained to determine geophysical lineaments in the subsurface, which were interpreted as the continuation into the basin of the Dílar Fault. Gravimetric sections were modelled using geological information to reconstruct the subsurface shape of the fault zone. Seismic noise measurements allowed us to determine high impedance boundaries that were used as constraints to reconstruct the gravity models. Magnetic data showed anomalous values in sections across the fault plane, although these are difficult to interpret due to interference from high voltage lines and other external noise sources. The GPR and electrical tomography data may provide information on the morphology of the Quaternary deposits and their possible link to recent fault activity. The three-dimensional digital model reconstructed by photogrammetry has been very valuable in the structural characterization of the fault. The high resolution of the model allowed for extracting structural information of the fault such as fault plane lineations and dip, as well as characterizing the deformations present in the sedimentary deposits of the hanging wall. In particular, minor faults and growth strata related to syntectonic activity could be successfully described. During the activities of the 3G project, collaborative scientific research activities have been carried out between the University of Malta and the University of Granada, through departments studying the local tectonics of their regions. The experiences gained in its implementation benefited both departments, gaining complementary knowledge in the study of tectonic structures by non-invasive methods. The results of this research are being analyzed and will be published.