GNGTS 2013 - Atti del 32° Convegno Nazionale

the presence of slope deposits and/or fractured rocks. The tomographic section shows that the grain size of deposits gets coarser downward. The tomographic section “Cava Civita Est” (Fig. 3b) shows a range of resistivity values similar to that of “Cava Civita West” (from 70 Ohm·m to more than 4000 Ohm·m) with slightly different values close to the surface, probably due to anthropogenic reworking. In the northern part of the section, the bedrock is much closer to the surface than in the “Cava Civita West”: this is probably due to a steeper slope, not allowing a thick deposition of slope deposits. Both sections crosscut the Pollino fault trace. In particular, two discontinuity planes (F1 and F2) are inferred by two steps of the high resistive area due to lowering of bedrocks and consequent increase of thickness of the deposits. The F2 interpretation in the “Cava Civita Est” section is questionable and the fault plane is traced as uncertain. Based on the interpreted sections we identify a normal fault zone with N°120 direction and metric offset. This is consistent with the estimates in another site along the Pollino fault (5 km apart from Civita site), where 6 m of offset, deduced from topographic measurements of the fault scarp, are reported (Ferreli et al. , 1994; Michetti et al. , 1997). Fig. 3 – Geophysical and paleoseismological data acquired across the Pollino fault: a) GOOGLE™ image of the Cava Civita site: tomographic line traces in yellow, the quarry area is highlighted; b) the two ERT acquired at Cava Civita site; c) the western quarry wall; d) the eastern quarry wall, where samples for datings have been taken (see detail in inset “e”). 113 GNGTS 2013 S essione 1.1