1. Institute of Geonics, Czech Academy of Sciences, Studentská 1768/9, 708 00 Ostrava-Poruba, Czech Republic
2. Department of Geography, University of the Philippines Diliman, 1101 Quezon City, Philippines
3. Institute of Cartography and Geoinformatics, ELTE Eötvös Loránd University, Pázmány P. sétány 1/A, H-1117 Budapest, Hungary
4. Institute of Geoecology and Geoinformation, Adam Mickiewicz University in Poznań, ul. Bogumiła Krygowskiego 10, 61-680 Poznań, Poland
5. Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41125 Modena, Italy
6. Laboratoire Magmas et Volcans, Observatoire du Physique du Globe de Clermont, Université Clermont Auvergne, Auvergne, IRD, UMR6524-CNRS, 63178 Aubiere, France