GNGTS 2014 - Atti del 33° Convegno Nazionale

All TEM soundings were perturbed by IP, but, surprisingly, in a quite different way: as shown in Fig. 3. This IP perturbation was found to depend on the repeating frequency in soundings 1, 2 and 3, while it was identical at all frequencies in the remaining 4, 5 and 6. It is worthwhile to specify that this behavior has never been reported before in the literature, at least to the knowledge of the authors. Of course we can try to invert these data by merging the IP effect into the constitutive TEM Fig. 3 – Experimental decay curves of the acquired TEM soundings 1 to 6 at the second test site located at RioloTerme town (Ravenna, N. Italy). The curves refer to the used frequencies. 162 GNGTS 2014 S essione 3.2