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

longitudinal profiles, stream gradient (Keller and Pinter, 2002), Stream-length index (Hack, 1973), valley floor ratio (Keller and Pinter, 2002; Štěpančíková et al., 2008), basin asymmetry (Keller and Pinter, 2002; Badura et al., 2007). Analysis of fluvial deposits The longitudinal profiles of the Pliocene and Pleistocene fluvial deposits were (re)constructed along the watercourses Vltava, Malše, Stropnice, Svinenský Stream and several tributaries. The basic topographic information, necessary for the morphostratigraphical correlation and placement of fluvial deposits, was obtained from the digital elevation model. Information about lithology and fluvial deposits was obtained from basic geological maps of the area, borehole documentation, andmany previous studies. The occurrence and extent of the fluvial depositswas extendedand locally specifiedby a field survey. R E S U LT S The set of proved or supposed tectonic faults was located by different methods. The morphologically most distinct linear structures were localised near Rychnov n/M, Kaplice and Nové Hrady (see Fig. 2). These features were subsequently surveyed by geomorphological methods in detail. Results of analysis of river geometry and terrain morphology (significant changes in values of stream gradient and SL index, remarkable changes in character of stream valley, basin asymmetry, and generally the terrain appearance) suggested that those structures are faults, which were active at least during the Pleistocene and their activity significantly affected the evolution of the terrain and local drainage. A possible reactivation of individual faults (Fig. 3) was assumed under the recent stress-field (S Hmax = 146 °). If S Hmax is horizontal in the ~NNW–SSE direction and S Hmax > Sv > S Hmin (‘strike-slip faulting regime’; Heidbach et al., 2016) the prevailing ~NE(NNE)–SW(SSW) trending faults would mostly reveal a sinistral strike-slip to weak reverse oblique-slip movement. A second set of subvertical ~NW(WNW)–SE(ESE) faults could be predominantly reactivated in a dextral strike-slip regime or as gentle reverse oblique-slip faults. In both cases, the oblique slip angle increases with the changing orientation of the fault plane to the direction perpendicular to S Hmax .