The project aims to assess Quaternary tectonic activity of selected faults in Czechia and France to improve knowledge of past earthquakes, fault segmentation, and their impact on seismic hazard assessment. Research will focus on the Mariánské Lázně Fault (MLF) in the Bohemian Massif and the La Marche Fault in the Massif Central. On the MLF, paleoseismological trenching, geomorphologicaql mapping, and geophsical surveys will reconstruct faulting history, date past surface-ruptirung events and clarify spatial and temporal variability between segments. The MLF, notable for its seismicity and morhology, provides a key site for testing models of rupture propagation. The La Marche Fault, although morhologically well expresses, has not yet been confirmed as active; it will be examined using geomorpological indicators and  geophysical profiling to access its role in intraplate stress concentration. Joint filed campaigns will integrate methods, exchange expertise, train young researchers, and expand datasets, strengthening cooperation and future seismic hazard research.