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

314 PATA Days 2024 Slip rate From the 54 m offset terrace riser we provide the first constraints of slip rate (Fig. 4). We observe a marine terrace deposits on top of the fold. From the UAV survey and geoid corrected elevations we show that these deposits are at 0 m a.s.l. From the Caspian Sea level curves (Pánek et al., 2016), the last highstand at 0 m (asl) is dated at 11 – 14 ka. As sea level retreated, the marine terrace is incised, and then the riser displaced by the successive earthquakes. Therefore, we obtain a slip rate of 3.9 – 4.8 mm/yr. Trench stratigraphy and earthquake recurrence Trench 1 (Fig. 4B) was excavated across a small pressure ridge created by a step left step in the fault. It was excavated into an alluvial fan and river terrace deposits. The trench has three main sedimentary facies. Facies 1, at the base of trench, and consists of a clay (U10) and bedded sand (U20) units. Facies 2 (U50, U60 and U65) contains intact marine shells, and coarse to fine sands. Facies 3 consists of fine sands and silts. Faulting in Trench 1 occurs in two zones either side of the scarp. We observe a flower structure with a series of upwards fault strand terminations and buried sheared fissures. We interpret the upwards and capped fault terminations as individual surface rupturing events. We also observe vertical offsets either side of the fault (Fig. 5). Fig. 3: Pleiades derived DEM showing the southern trace of the West Caspian Fault near Salyan. The fault trace bends and shows antithetic left-lateral strike- slip faulting.