GNGTS 2022 - Atti del 40° Convegno Nazionale

444 GNGTS 2022 Sessione 3.2 knowing the depth of the roof of some cavities, we estimated a dielectric constant of near 14, expected due to the moist sediments. At the expected depth, the cavities can be interpreted as a sharped lack of continuity of some reflectors. However, the shadow cause by the shallow anomalies may trick the interpretation without this previous knowledge. In figure 2c we have overlaid the fig. 2a and 2b to compare and find the best possible location and geometry for the cavities’ distribution during a blind interpretation. The comparison shows that the two cavities are excavated to the same depth (between 3m and 6m) and furthermore, the anomalies seem to correspond with the positions of the cavities found during the various inspections. Fig. 2 - Data Integration, a) ERT Survey line 1, after the inversion and interpretation, b) GPR survey line (antenna 200MHz) parallel to the ERT-line 1, c) Superposition of the ERT and GPR surveys.