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

3, corresponding to unconsolidated sediments and indicating a descending basement level. Although the resolution limitations prevent precise identification of sediment offset amounts, we infer that the sediments were deformed by active faulting, and thus, the trench site was identified between these two ERT profiles. TRENCH SECTION DESCRIPTION The paleoseismic trench excavated between ERT Line 1 and 2 along one of the beheaded channel exposed the presence of faulting between the metamorphic rock (to the north-westward) against carbonate rock (to the south-eastward), overlain reddish- brown massive silty mud (Unit 20), brownish-gray rock fragment- supported colluvial wedge (Unit 11), and light brown poorly sorted silty pebbles to cobbles (Unit 10) (Fig. 4a). Unit 20 is a ~2.8-m-thick layer lacking internal stratification. The texture of clay peds in Unit 20 seems to be a argillans, and the micromorphological analysis indicates the presence of illuvial clays without carbonates. Unit 11 shows a brownish-gray color of the matrix, the lack of an internal paleosol, and poorly sorted and rounded clasts with no stratification. These observations and termination of the fault strand at the top of Unit 20 imply that Fig. 4: (a) Photomosaic of trench wall with a sketch of the trench logs. OSL sampling locations are marked by yellow circles. Mciro-structural analysis showing (b) left-lateral sense of shear in the fault core and (c) principal slip zone (PSZ) deformed by faulting between the fault core and Unit 20.