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

474 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 Active normal faults; tectonic geomorphology; cosmogenic nuclides dating (1) Department of Engineering and Geology, Università degli Studi G. d’Annunzio Chieti e Pescara, Chieti, Italy (2) University of Aix Marseille, CNRS, IRD, INRAE, CEREGE, Aix-en-Provence, France (3) Department of Engineering and Geology, Università degli Studi G. d’Annunzio Chieti e Pescara, Chieti, Italy (4) IRSN/PSE-ENV/SCAN/BERSSIN, Institut de Radioprotection et de Sureté Nucléaire, Fontenay-Aux-Roses, France (5) Dipartimento di Fisica e Geologia, Università di Perugia, Perugia, Italy (6) Istituto di Geofisica e Vulcanologia, Rome, Italy (7) Istituto di Geofisica e Vulcanologia, Rome, Italy *Email: alessio.testa@unich.it / benedetti@cerege.fr / paolo.boncio@ unich.it / stephane.baize@irsn.fr / francesco.mirabella@unipg.it / stefano.pucci@ingv.it / riccardo.civico@ingv.it Alessio Testa (1) Lucilla Benedetti (2) Paolo Boncio (3) Stephane Baize (4) Francesco Mirabella (5) Stefano Pucci (6) Riccardo Civico (7) FIRST ESTIMATE OF THE LONG-TERM FAULT DISPLACEMENT AND SLIP RATES OF THE ANGHIARI NORMAL FAULT (NORTHERN APENNINES , ITALY) . A B S T R A C T Geomorphological analysis along the NE-dipping Anghiari normal fault (Northern Apennines of Italy) highlights evidence of active faulting and deformed morphological markers that allow assessing the cumulative fault displacement. We focused onwell-preserved paleosurfaces located on the eastern side of the Anghiari ridge both at the Anghiari fault hanging wall and footwall. Cosmogenic nuclide dating (36Cl and 10Be) of both these surfaces yielded the same age of 40-45 kyrs, implying that the Anghiari fault has been active in this time period, and we measured the displacement affecting those surfaces to assess the long-term slip rate of the Anghiari fault. The age of the surfaces at both the hanging wall and at the footwall of the Anghiari fault results in 40-45 kyr. It means that the surfaces belong to the same cut terrace, displaced by the fault. We discuss the discrepancy between the resulting slip rate (0.6-1.3 mm/yr) over 40-45 kyrs and the slip rate values resulting from paleoseismology (0.14-0.35 mm/yr over the last 25ka).