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

associated with the Lower Rhine Graben and especially with the Feldbiss Fault Zone unraveling late Holocene surface rupturing faults. Weconductedapaleoseismological trenchingcampaign on the southern tip of the fault zone at the Feldbiss Fault, close to Aachen, to expand our understanding of recent and past fault activity. We combine morphological analysis, shallow geophysics, and paleoseismological trenching. Stratigraphic units show a cumulative vertical displacement of 1.2 meters. We interpret an occurrence of a minimum of 3 Late Pleistocene to Holocene events. However also, older events testify to the seismic activity of the Feldbiss Fault in the past. Just in spring 2024, we trenched also the neighboring Sandgewand Fault and detected also paleoseismic evidence for surface rupturing earthquakes. Data are preliminary and we are awaiting dating. Fig. 1: Study area in central Europe with historical seismicity C O N C L U S I O N S Recognizing active faults in Active Intraplate Regions (AIRs) or Stable Intraplate Regions (SIRs) is not an easy task in highly vegetated and populated areas, e.g., of Central Europe. Our findings highlight the seismic potential of the eastern RGBF in the URG, providing new evidence of Late Pleistocene and Holocene tectonic activity in its central section or segment. Our investigation reveals significant geometric complexity with predominant left-lateral kinematics and a strong influence from the extensional phase of the graben on the morphology. Based on geometric and structural discontinuities in fault traces (such as bends, gaps, and strike changes) and the occurrence and degradation state of tectonic landforms (including triangular facets, beheaded channels, and hanging