GNGTS 2021 - Atti del 39° Convegno Nazionale

455 GNGTS 2021 S essione 3.2 Conclusions The results of electrical resistivity measurements in an active fault zone, located in Southern Apennines (Italy) and characterized by numerous non-volcanic CO 2 emissions, allowed to define a high-resolution physical model of the investigated subsoil in terms of resistivity values distribution and to identify the anomalous sectors correlated to the presence of CO 2 migration pathways. The study provided a significant contribution to the geological-structural reconstruction of the Ailano area. Indeed, it was able to identify N-S trending, E-dipping high-angle faults responsible for the offset of the sedimentary succession and for the control on the shape of the shallow aquifer, and that can be considered preferential paths for gas and fluid uprising. In this framework, the ERT technique has proved to be a valid, high-resolution investigation tool for identifying the presence and geometry of shallow active buried faults as well as the carbon dioxide distributions associated with these faults. References Annunziatellis, A., Beaubien, S.E., Bigi, S., Ciotoli, G., Coltella, M., and Lombardi, S., 2008: Gas migration along fault systems and through the vadose zone in the Latera caldera (central Italy): Implications for CO 2 geological storage . International Journal of Greenhouse Gas Control, v. 2, p. 353-372. Arts, R.J., Baradello, L., Girard, J.F., Kirby, G., Lombardi, S., Williamson, P., and Zaja, A., 2009: Results of geophysical monitoring over a “leaking” natural analogue site in Italy . Energy Procedia, 1(1), 2269- 2276. Fig. 3 - Reconstruction of shallow active buried faults (red lines) based on the electrical resistivity tomography results and geomorphological elements.