Raffaele Castaldo¹, Andrea Barone jr², Francesco Casu¹, Prospero De Martino³, Mariarosaria Manzo¹ and Pietro Tizzani¹, (1)CNR Institute for the Electromagnetic Sensing of the Environment, Naples, Italy, (2)Department of Earth, Environmental and Resources Science, University of Naples “Federico II”, Naples, Italy, (3)National Institute of Geophysics and Vol, Napoli, Italy