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

136 PATA Days 2024 D I S C U S S I O N The increase in wedge height, displacement of Pa fault, and angle of the PTS wedge with increasing syntectonic sedimentation rate suggest that structural system deformation occurs both vertically and toward the hinterland rather than toward the deformation front (Fig. 4). This indicates that syntectonic sedimentation imposes significant resistance on the structural system, limiting its propagation towards the deformation front. Furthermore, the reduction in the deformation front length relative to the Pa fault, when facing higher sedimentation rates, provides additional evidence of how sedimentary load acts as an obstacle for structural system propagation (Fig. 4). Additionally, syntectonic sedimentation contributes to simplifying structural geometry, avoiding more complex configurations. The syntectonic sedimentation portion of model C09 was applied to the Los Andes-San Felipe Depression case, the transition zone was applied to the northern part of this depression, while the northern part of the model without sedimentation was applied to the region north of the Putaendo River. This analogy allows hypotheses regarding the structural evolution of the case study. In the southern part of the study area, where the Cariño Botado fault system is located, the deformation front remains to the east, at the eastern edge of the Los Andes-San Felipe Depression (Fig. 1), affected by the resistance of the Los Andes-San Felipe Depression sedimentary deposit, would hinder the propagation of the structural system to the west. In the transition zone, El Saino and Los Quemados faults develop further westward compared to the Cariño Botado fault system (Fig. 1), attributed to the absence of sedimentary load, allowing greater propagation of the structural system to the west. Moreover, the structural pattern is relatively simple, with west-dipping synthetic faults. In the northern part of the study area, sedimentary deposits are practically nonexistent (Fig. 1), allowing the deformation front to develop even further westward compared to the transition zone. This northern section presents amore complex structural pattern, as observed in the Las Minillas fault system, with evidence of antithetic deformation and a series of synclines and anticlines (Arias, 2019), similar to what is observed in analogous models without sedimentation. Comparing these observations with the plan view model reveals the difference between the analyzed segments of the case study. In the southern zone, the deformation front remains on the eastern side due to the presence of the sedimentary deposit, preventing the structural system frompropagating westward, whereas in the north, the structural front develops further westward due to the absence of deposits hindering the propagation of the structural system in this direction. Fig. 4. Analog model C09. A-B: Northern section; C Transition section; E-F: Southern section. The main faults of structural system are indicated (Symbology in Fig. 3). Fig. 4. Analog model C09. A-B: Northern section; C-D: Transition section; E-F: Southern section. The main faults of the structural system are indicated (Symbology in Fig. 3).