Proceedings of the 12th International INQUA meeting on paleoseismology, active tectonic and archaeoseismology

28 PATA Days 2024 of unconsolidated deposits and the unit F interpreted as the impervious basement shows increasing resistivity values with the depth, from 460 Ohm-m until more than 3689 Ohm- m. The drilling information of Well N°1 allowed us to assess the lithology and the presence of clay minerals in the geological log of the well. Also, the water level data showed in Fig 3. The LiDAR data and field observations showed geomorphological characteristic consistent with the occurrence of fault traces between the location of the ERT cross section and the observed San Ramon Fault, around 2 km towards the north. The shape of the resistivity anomalies in the profile together with the geomorphological analysis of the LiDAR data allowed us to draw the possible location of the San Ramon Fault (SRF) traces in the hydrogeological cross section showed in Fig 3. Fig. 2: ERT profile from La Reina, in the eastern border of Santiago (see Fig. 1). Fig. 3: Hydrogeological conceptual cross section scheme at La Reina district, with groundwater flow and recharge associated to eastern branches of the San Ramón thrust fault, around 2 km southward from an outcrop where the fault was observed in Las Condes district (see Easton et al., 2022; 2024).