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

392 PATA Days 2024 population and infrastructure, similar to the San Ramón fault system. Both fault systems are located at the foot of the mountain front that bounds the western edge of the Principal Andean Cordillera along the same north-south-oriented morpho-structural boundary, making it impossible to rule out a structural and temporal relationship regarding large earthquakes with shallow seismic rupture; therefore, they remain relevant research targets. C O N C L U S I O N S This study integrates fieldwork, satellite imagery, and geochronology to analyze active tectonic structures in Central Chile. Evidence of recent tectonic activity, including thrust faults uplifting Cenozoic rocks over Quaternary deposits, indicates a cumulative uplift of ~3.2 m since ~8.7 ka. Fluvial terraces and pediments suggest a cumulative uplift of ~130 m along the CBF since 900 ka. Morphometric Fig. 4: Field photographs of knickpoints. Examples of knickpoints and their heights are shown at: (a) ~600 m, (b) ~1.5 km, and (c) >2 km east of the CBF’s main fault. In (b), the highest knickpoints (1.87 m) recognized in the area and formed in brecciated rocks (from Quezada, in progress).