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

R E S U LT S Using the DSM from Pleiades images we mapped the alluvial fans, fault scarps, paleosurfaces and triangular facets. The uppermost surfaces (orange in Fig. 2) are continuous and elongated in the direction of the ridge (NW-SE), decrease in elevation from north to south, are parallel to the drainage of the Tiber and Sovara rivers, and are tilted toward westward. The other surfaces (green in Fig. 2) are smaller and disjointed by SW-NE oriented gullies, and they are located at different elevations, often separated by the Micciano fault section, belonging to the Anghiari fault. The presence of the fault between those surfaces has been verified thanks to paleoseismic investigations (Testa et al., 2023). The area where these paleosurfaces are mainly clustered has been investigated thanks to the DTM LiDAR. The location of the sampling sites for cosmogenic nuclides dating is also shown on the map. Profiles 1, 2 and 3 (Fig. 3) show the points projection of the risers and gullies on the topographic profiles parallel to the average direction of drainage. Here we tried to quantify the potential displacement between surfaces separated by the fault sections, the incision between surfaces and gullies, and their average slope. The small discontinuous surfaces (green) dip from 1 to 6 degrees towards NE, with slope values comparable to or slightly smaller than those of the gullies. The vertical displacement of the surfaces along the Micciano fault section ranges from 23 to 43 m (29 to 54 m of along dip displacement), with the maximum value along profile 1 (surfaces projected from the southern side). The vertical displacement of the surfaces along a secondary splay of the Anghiari - Motina fault section ranges from 18 to 20 m, with the maximum value along profile 2 (surfaces projected from the northern side). The fault displacement is comparable with the value of the incision of the surfaces with respect to the gullies, except for profile 3, where the gully is much more incised. The exposure age of the paleosurfaces coming form he cosmogenic nuclides dating results in 40- 45 kyr at the hanging-wall of the Micciano fault section (Villa Sterpeto Site) and 45 kyr at the footwall of the Micciano fault section (Cicogna 2 site). Unfortunately, we have no results for the site Cicogna 1 (hanging-wall of the Micciano fault section) because of human modifications and consequent reworking of the pebbles. Fig. 3: Interpretation of topographic profiles with the projection of the gullyes and risers of paleosurfaces.