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

166 1 2 T H I N T E R N AT I O N A L I N Q U A M E E T I N G O N PA L E O S E I S M O L O G Y , A C T I V E T E C T O N I C S A N D A R C H A E O S E I S M O L O G Y ( PATA ) , O C T O B E R 6 T H - 1 1 T H , 2 0 2 4 , L O S A N D E S , C H I L E PATA Days 2024 K E Y W O R D S morphotectonics, SL index, f luvial deposits, river network change, Bohemian Massif (1) Institute of Rock Structure and Mechanics, Czech Academy of Sciences, Prague, Czechia (2) Institute of Geology and Paleontology, Faculty of Science, Charles University, Prague, Czechia (3) Institute of Petrology and Structural Geology, Faculty of Science, Charles University, Prague, Czechia *Email: flasar@irsm.cas.cz Jan Flašar (1) Petra Štěpančíková (1) Karel Martínek (2) Kryštof Verner (3) Radka Kalinová (3) LATE CENOZOIC TECTONIC EVOLUTION OF THE TERRAIN AND FLUVIAL SYSTEMS IN THE AREA OF NOVOHRADSKÉ HORY MTS. (BOHEMIAN MASSIF, CZECHIA, CENTRAL EUROPE): MULTIDISCIPLINARY APPROACH A B S T R A C T The Bohemian Massif (Czechia, central Europe) has been a relatively stable, intraplate area in its recent geological history. However, it is generally believed that Novohradské hory Mts. (southern part of the Bohemian Massif) went through massive tectonic uplift in Pliocene because of rejuvenation of older fault systems. In such areas using conventional methods is limited when studying active tectonics due to indistinct expressions of tectonics in morphology. This study is bringing new data using unique combination of several methods (morphotectonics, structural geology, fluvial geomorphology and sedimentology) to better understand the evolution of local terrain and fluvial drainage. We have suggested the reactivation of faults under the recent stress- field, and the uplift linked with significant changes in the river network during the younger Pliocene and Lower Pleistocene, more recently than previously assumed. I N T R O D U C T I O N The Bohemian Massif is part of the stable European platform in the northern foreland of the Alpine–Carpathian fold–thrust belt, which has traditionally (Kopecký, 1970) been regarded as a tectonically stable intracontinental region. However, it is generally believed, that some areas – particularly the bordering mountains – went through massive tectonic uplift in the Cenozoic and older fault systems were rejuvenated (Coubal et al., 2015; Štěpančíková et al., 2019). However, the localisation, scale and dating of tectonic processes is still poorly understood. In the intraplate setting, the use