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

470 PATA Days 2024 component. Pronounced scarps on the E- dipping northern slope and their absence or decrease on the southern slope suggest an oblique normal- dextral fault. The slip vector aligns semi-parallel to the dip direction of the southern slopes, explaining the lack of scarps there. Additionally, the strike-slip component contributes to the exaggeration of the scarp high on the northern slopes. The geological mapping aimed to evaluate the orientation of bedding on both sides of the scarp. Across it, there is a noticeable change in the dip direction, transitioning from NE to ENE-SE. Remarkably, on the eastern side of the scarp, all streams display a more pronounced undercutting on the right bank. This is probably attributed to the streams diverting towards this bank along the dip direction of the strata. Such a shift suggests the presence of an older fault, with a significantly larger offset than the one responsible for creating the studied scarp. Consequently, it is plausible that the studied fault represents a reactivated deformation. We applied georadar, electric resistivity tomography, and induced polarization measurements to image the shallow subsurface across the scarp in various locations. All results show an anomaly beneath the scarp, pointing to a fault. Tre D n e c s h p i i n te g the scarp intersecting four streams, the absence of sag ponds suggests a downward shift in the eastern blocks downstream. Additionally, the incised V-shaped valleys lack terraces that could have provided deformation and dating clues. Consequently, we chose to excavate a trench on the slope where the scarp was best preserved and where some sediment cover could be expected. The palaeoseismological trench across the studied scarp was 30 m long and 1 - 2.5 m deep. Within the trench, we distinguished five units: 1) bedrock, 2) detached and heavily fractured bedrock, 3) matrix-supported conglomerate extending throughout the entire trench, 4) bedrock fragments of various sizes, densely packed within a sandy-clay matrix, confined to the scarp area, 5) a dark gray sandy-clay matrix densely packed with strongly fragmented bedrock, distinguishable from the layers it intersects. Fig. 2: Topographic lineament near Brzegi village in Podhale Basin (Poland) visible on LiDAR DEM (GUGiK, www.geoportal.gov.pl) .