Carmen Esposito, Paolo Berardino, Alessandro Di Vincenzo, Institute for Electromagnetic Sensing of the Environment (IREA) - National Research Council (CNR), Italy; Jorge Euillades, Universidad Nacional de Cuyo, Argentina; Riccardo Lanari, Antonio Natale, Institute for Electromagnetic Sensing of the Environment (IREA) - National Research Council (CNR), Italy; Stefano Perna, University of Naples “Parthenope”, Italy