Applicant teams include experienced scientists and young researchers that localize and characterize seismogenic faults required for improving seismic hazard assessment (SHA). The both teams already worked together on active faults in Czechia and Bulgaria during previous joined mobility project. New fault traces were discovered and important paleoseismic data obtained. Intended continued cooperation under the proposed project aims to obtain new data for further and deeper understanding the faults behaviour. The scope of the project in Czechia is to obtain more precise paleoseismic data for selected faults, such as the Mariánské Lázně fault and newly also the Krušné hory Mts fault to determine fault parameters based on dated offset features (slip, slip-rate, etc.). This will enable more reliable SHA calculations in future for the Bohemian Massif. In Bulgaria, the work will be addressed to faults along Balkan range front, such as Devene fault and North Sofia fault. The primary scope will be to find ruptured young sediments and landforms that allow reconstruction of earthquake history.