1. Department of Computer Engineering, Modeling, Electronics, and Systems Engineering, University of Calabria, Rende (CS) 87036, Italy
2. Department of Mathematical and Computer Sciences, Physical Sciences and Earth Sciences, University of Messina, Messina 98166, Italy
3. Istituto Nazionale di Geofisica e Vulcanologia (INGV), Roma 00143, Italy
4. Department of Engineering, University of Messina, 98166 Messina, Italy