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

398 PATA Days 2024 fault. The core sites were selected based on bathymetry lines, in the depocenter at water depths of 6m (Takhilt Lake), 8m (Oygon Lake), and 7.5 m (Sangiyn Dalai Lake). To recover the samples we used a gravity corer operated from a boat. The cores were analyzed using X-ray Computerized Tomography (CT) with a resolution of 0.25 mm, X-ray fluorescence (XRF) at resolutions of 0.5 mm and 1 mm, hyperspectral imaging at 0.15 mm of resolution, grain size (in progress), thin sections (in progress), and logging of physical properties. Chronology was based on radiocarbon (14C) dating on macro-remains, specifically: seeds, roots, and plant fragments (stems, leaves). Although a good part of the sedimentary record seems to be associated with in-lake processes, our geochemical results, show some peaks of relative abundance in titanium and silicate elements (e.g. Si, Al, K), indicating a likely terrestrial input. In this ongoing work, we present the first paleoseismic records from lacustrine environments located around the Bulnay fault system, in northwestern Mongolia. Fig. 1: a) Tectonic setting of the study area. b) Geological and structural map around the Bulnay fault system (modified from Choi J-H et al (2018)), black starts indicate the epicenters of the Bulnay and Tsetserleg earthquakes. c) Spatial distribution of different lakes around the Bulnay fault, red starts highlight the sites of coring.