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

224 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 Microseismicity, quaternary faults, tectonic geomorphology, structural geology, seismic hazard (1) Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile. (2) Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile. (3) Tomos, Santiago, Chile. *Email: josgonal@uchile.cl José González-Alfaro (1, 2) Bertrand Potin (1, 3) Carolina Gutiérrez (3) Sergio Ruiz (1) Constanza Ulloa (2) Gabriel Easton (2) UNRAVELING THE MICROSEISMIC ACTIVITY OF THE PUERTO ALDEA FAULT: SEISMIC HAZARD ASSESSMENT ALONG COASTAL LA SERENA-TONGOY, NORTHERN CHILE (PRELIMINARY RESULTS) A B S T R A C T The Puerto Aldea Fault, situated at the southern edge of the Challenger tectonic segment in the Coquimbo Region, exhibits evidence of neotectonic activity. Recent microseismic data from a local temporary network indicate the presence of crustal seismicity in the study area. Consequently, the primary aim of this investigation is to assess the seismic activity and kinematics of the Puerto Aldea Fault. The methodology employed entails the deployment of temporary seismological stations along the Puerto Aldea Fault, followed by the analysis and relocation of acquired data using machine learning algorithms to illuminate subsurface structures. Additionally, seismic reflection profiles were performed in Tongoy Bay. The culmination of these efforts will involve the development of a three-dimensional structural model depicting active faults at depth. Ultimately, the study aims to comprehensively evaluate the seismic hazard of the Puerto Aldea Fault and its impact on coastal urban areas. I N T R O D U C T I O N Upper continental crust faults are geological features of significant relevance in Earth science research. Particularly, in subduction systems such as the Chilean margin, these faults possess substantial complexities for their study. This complexity arises from their involvement in the deformation of the Earth's crust, a primary consequence of the interaction between tectonic plates and the seismic cycle of subduction earthquakes in regions proximal to the continental margins (Farías et al., 2011; Aron et al., 2013; Cortés- Aranda et al., 2015; Ammirati et al., 2019; Villalobos et al., 2020). The geodynamic configuration of subduction zones can partition