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

338 1 2 T H I N T E R N AT I O N A L I N Q U A M E E T I N G O N PA L E O S E I S M O L O G Y , A C T I V E T E C T O N I C S A N D A R C H A E O S E I S M O L O G Y ( PATA ) , O C T O B E R 6 T H - 1 1 T H , 2 0 2 4 , L O S A N D E S , C H I L E PATA Days 2024 K E Y W O R D S Palomares Fault, Eastern Betic Fault Zone, paleosismology, Upper Pleistocene (1) RISKNAT Research Group, GEOMODELS Research Institute, Universitat de Barcelona, 08028 Barcelona, jmolinsvigata@ub.edu; maria.ortuno@ub.edu; jj.gallego.montoya@ub; marc.olle@ub.edu; octgomez@ub.edu; eulalia.masana@ub.edu; raimonpallas@ub.edu; (2) Dpto. Geodinámica, Estratigrafía y Paleontología, Universidad Complutense de Madrid. 28040 Madrid, insuarev@geo.ucm.es (3) Instituto Geológico y Minero de España - CSIC, 41013 Sevilla, r.martin@igme.es (4) Institut de Radioprotection et de Sûreté Nucléaire (IRSN), 92260 Fontenay-aux-roses, France, Stephane.baize@irsn.fr (5) Department of Geological Sciences, San Diego State University, San Diego, CA, USA, trockwell@sdsu.edu *Email: jmolinsvigata@ub.edu Molins-Vigatà, J. (1) Ortuño, M. (1) Insua-Arévalo, J.M. (2) Martín-Banda, R (3) Gallego-Montoya, J. (1) Ollè, M. (1) Gómez-Novell,O. (1,2) Baize, S. (4) Rockwell, T. (5) Masana, E. (1) Pallàs, R. (1) FIRST PALEOSEISMIC EVIDENCE OF LATE UPPER PLEISTOCENE ACTIVITY OF THE PALOMARES FAULT, SE IBERIA A B S T R A C T The Palomares Fault (PF) is a significant structure within the Eastern Betics Shear Zone in southeastern Spain, a left lateral traspresive system that absorbs great part of the convergence between Eurasian and Nubian plates. Few studies have been done in the PF and some paleoseismological studies have been conducted on the fault. Despite this the available slip rates along the fault exhibit considerable uncertainties posing challenges for the development of reliable seismic hazard models for the system. In this study we present a morphotectonic and geomorphological analysis of the PF at its northern termination. After exhausted fieldwork various outcrops of the fault have been found and studied and a paleoseismic trench has been done, identifing evidence of Quaternary deformation. An age of 19.4 ± 1.1 Ka has been obtained by OSL dating of the uppermost unit affected by the fault. These are the first steps of this project with the main objective to characterize fault source parameters to better constrain the seismic potential of the PF. I N T R O D U C T I O N Paleoseismology is one of the most commonly used tools for characterizing active faults and estimating their parameters, which are subsequently employed in seismic hazard studies. Numerous paleoseismic studies have been conducted on the different faults within the Eastern Betic Shear Zone (EBSZ), demonstrating their seismic potential (e.g. Gómez- Novell et al., 2022; Martín-Banda, 2020). The compilation of data from these studies has allowed for