GNGTS 2013 - Atti del 32° Convegno Nazionale

The Faeto Flysch crops out in the upper and middle parts of the Rio Nocelle catchment, and the Villamaina Unit crops out in the lower part of the catchment. Quaternary alluvial sediments are present in the Cervaro River valley. In the study area, rocks exhibit a composite structural setting, reflecting a complex tectonic history (Pescatore et al. , 1996; Amore et al. , 1998; Di Nocera et al. , 2011). Results. Here we discuss only two of the sixteen ERT carried out on Montaguto landslide: the ERT 1 of both the first (July 2011) and second field surveys (October 2012) (Fig. 3). For all the ERT carried out, the spatial variability of the electrical resistivity was quite limited. Resistivity values ranged between 3 and 40 Ω·m, that are typical values for clayey soils. The ERT 1 carried out during the first field survey was placed in parallel to the drainage trench at a quote of 675 m a.s.l. and showed both vertical and horizontal varying resistivity (Fig. 3). More in detail, between 100 and 160 m a superficial sector relatively more resistive, about 10 m thick, likely due to the drainage trench and landslide material, was clearly identifiable. Underlying that, there was a conductive layer limited laterally by more resistive zones, probably constituted by bedrock. Finally, in the NW sector, a low resistivity zone is evident that can be interpreted as clayey or water-rich material. The ERT 1 carried out during the second field survey (Fig. 3) was realized at about 616 m a.s.l.. The electrical image showed both vertical and horizontal varying resistivity. In particular, Fig. 3 – Resistivity models of ERT 1 carried out on the Montaguto landslide in July 2011 (top) and October 2012 (bottom). 99 GNGTS 2013 S essione 3.2