1. Department of Earth and Geoenviromental Sciences, University of Bari Aldo Moro, Bari, Italy
2. CNR-IGG, Institute for Geosciences and Earth Resources, National Center of Research, Pisa, Italy
3. Instituto de Investigaciones en Ciencias de la Tierra, Universidad Michoacana de San Nicolas de Hidalgo, Morelia, Mexico
4. Division of mapping and exploration, Iceland GeoSurvey, Akureyri, Iceland
5. Department of Earth Sciences, University of Florence, Italy