1. National Research Council of Italy, Institute of Atmospheric Sciences and Climate (CNR-ISAC), 73100 Lecce, Italy
2. Laboratoire Magmas et Volcans, CNRS, IRD, OPGC, Université Clermont Auvergne, F-63000 Clermont-Ferrand, France
3. National Research Council of Italy, Institute of Atmospheric Sciences and Climate (CNR-ISAC), 88046 Lamezia Terme, Italy
4. Italian Institute for Environmental Protection and Research (ISPRA)—Geological Survey of Italy Department, Via Brancati 48, 00144 Roma, Italy
5. Istituto Nazionale di Geofisica e Vulcanologia (INGV)—Sezione di Palermo, Sede Operativa di Milazzo (ME), 98057 Milazzo, Italy
6. Department of Mathematical and Informatics Sciences, Physical Sciences and Earth Sciences (MIFT), University of Messina, 98166 Messina, Italy
7. Department of Industrial Engineering and Mathematical Sciences, Università Politecnica delle Marche, 60131 Ancona, Italy