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

370 PATA Days 2024 Through field-based tectono-geomorphic observations, fault-zone mapping, and structural data retrieval, we aimed to understand the faulting mechanics and identify subsurface structures responsible for surface deformation caused by the 2008 Nura earthquake. We carried out a comprehensive survey of surface breaks in our 2018 field campaign. Utilizing an unmanned aerial vehicle (UAV), we generated high-resolution digital surface models (DSM) formethodical surface rupturemapping and precise vertical separation measurements. Additionally, luminescence dating was employed to gain insights into the long-term behavior of the fault zone. Geology and morphological observations The Pamir-Tien Shan collision zone is characterized by northeast-trending folded Cretaceous-Paleogene strata, partly covered by northwest-dipping Neogene conglomerates, and bounded by Silurian-Devonian units kozlov (Kozlov & Artemov, 1964). Northwest- dipping Paleogene syncline limbs are exposed repeatedly along strike, extending for about 8 kilometers northeast from the Nura settlement (Figure 1). Interestingly, southwest of the Nura settlement, subparallel to the trend of these synclinal limbs, is where the rupture of the 2008 Nura earthquake broke along the northwestern Nura River bank. This area is covered by glacial till originating from the Trans Alai Range to the South. Along the rupture zone, we observed numerous secondary features associated with fault-zone deformation, including fault- parallel sinkholes, ponded sediments against the fault scarp, and different types of mass-movement deposits. In the southwestern Fig. 2: (a) Shaded-relief topography of digital surface model from unmanned aircraft vehicle photography acquisition overlain by surface- rupture traces (red lines). Boxes indicate location of close-ups of selected areas along the surface rupture in (b) and (c). (b) Left: Unmanned vehicle aerial photo; Right: Shaded-relief topography with explanations. (c) Mapped rupture trace. Modified from Patyniak et al. in press.