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

98 PATA Days 2024 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 K E Y W O R D S Active faults of Italy; seismic hazard; offset streams; displaced marine terraces; Sybaris archaeological site (1) Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy *Email: francesca.cinti@ingv.it (corresponding author) Cinti F.R. (1) Alfonsi L. (1) Cucci L. (1) Pantosti D. (1) MULTIDISCIPLINARY APPROACH TO INVESTIGATE “HIDDEN” SEISMIC HAZARD SOURCE: THE CASE OF NE-SW SIBARI FAULT ZONE IN IONIAN NORTHERN CALABRIA ( ITALY) A B S T R A C T A multidisciplinary approach including archaeological, geophysical, and geological/geomorphological surveys provided pieces of evidence that allowed us to identify a previously unknown active fault zone, i.e. the Sibari fault zone (SFZ) in Northern Calabria (Italy). The SFZ runs in a ~NE-SW direction for a length of ~18 km from the Ionian coastline to onshore and has an oblique normal-dextral kinematics. The envelope of the SFZ is derived from several direct and indirect evidence resulting in subparallel and locally en-echelon fault traces over a maximum 500 m-wide band, running at different elevations across hills and flat lands. The SFZ was active since at least the Middle-Upper Pleistocene, producing faulting of alluvial deposits, marine terraces, drainage incisions, and the archaeological structures of Sybaris. Considering our findings, the newly recognized SFZ should be included among the faults that contain a potential seismic hazard in this poorly known portion of the Ionian sector of northern Calabria. I N T R O D U C T I O N The work by Cinti et al. (2024) focuses on the recognition and understanding of the NE-SW Sibari Fault Zone (SFZ) in northern Calabria, southern Italy (Figure 1) by means of the analysis and the integration of multidisciplinary data. These data have been collected at different sites and at different scales of investigation: archaeoseismic and geophysical data surveyed in and around the Sybaris archaeological area (Zone 1 in Figure 2), morphotectonic data from a small area near Terranova da Sibari (Zone 2 in Figure 2) and analyzed fluvial and coastal systems (drainage pattern, marine terraces) in a wide area of the plain and bounding hills (Zone 3 in Figure 2). A multidisciplinary approach is mandatory as most of the Sibari fault zone is deeply buried and hidden below the Quaternary thick sedimentary cover of the flat Sibari plain,