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

52 PATA Days 2024 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 K E Y W O R D S Active fault; Seismic hazard; Yeongdong Fault; Paleoseismological trench; Korean Peninsula (1) GSGR, Major of Environmental Geology, Pukyong National University, Busan, Korea. (2) Department of Geography, Kyungpook National University, Daegu, Korea. (3) Department of Geology and Research Institute of Natural Science, Gyeongsang National University, Jinju, Korea. (4) Division of Earth and Environmental Sciences, Korea Basic Science Institute, Chungbuk 363-883, Korea. *Email: teriousbae8@gmail.com Sangyeol BAE (1) Jeong-Sik OH (2) Naik Sambit Prasanajit (1) Kiwoong Park (1) Junyeop Kim (1) Dohee Gu (3) Donghwa Yun (3) Jeong-Heon Choi (4) Hyeon-Cho Shin (1) Young-Seog Kim (1) CHALLENGES OF PALEOSEISMOLOGICAL ANALYSIS OF STRIKE-SLIP YEONGDONG FAULT IN A SLOWLY DEFORMING REGIONS (THE CENTRAL PART OF KOREAN PENINSULA) A B S T R A C T The Korean Peninsula, located on the Eurasian Plate, is considered a slow tectonic region. Because of this, instrumental and historical earthquake data should be complemented with paleoseismological studies for more precise seismic hazard assessments. Historical records indicate that earthquakes with intensities of VII-IX have occurred in the central part of the Korean Peninsula, which hosts several major urban centers. These events highlight the necessity of detailed seismic source characterization, such as active fault mapping and paleoseismic studies. The present study includes geomorphic and geophysical analyses to determine trench locations along the Yeongdong Fault (YF), a NE-SW trending strike-slip fault. Geomorphic features indicate that the YF reactivates as a right-lateral strike-slip fault due to neotectonic activity. One trench, selected based on ERT results, reveals evidence of Quaternary faulting activity derived from OSL. These findings will contribute to better seismic hazard assessments in the urban areas of central Korea. I N T R O D U C T I O N Paleoseismological studies arevaluable forunderstanding the long-term seismic activity of a region and enable seismic hazard assessments for populated areas and critical infrastructure. Paleoseismology is crucial in intraplate regions because it helps identify and understand seismic activity that may not be evident from historical records alone. The Korean Peninsula which is located in the Eurasian Plate and it has experienced several damaging earthquakes in the historical past (Fig. 1).