Institute of Methodologies for Environmental Analysis, National Research Council, C.da S.Loja, 85050 Tito (PZ), Italy

Department of Earth Sciences, Sapienza University of Rome, P.le Aldo Moro, 5 - 00185 Rome, Italy

Italian Space Agency (ASI), Via del Politecnico snc, 00133 Rome, Italy

Departament of Earth Sciences, Faculty of Sciences and Technology (Polo II), University of Coimbra, Rua Sílvio Lima, 3039-790 Coimbra, Portugal

Instituto de Geociencias, IGEO (CSIC-UCM), C/ Del Doctor Severo Ochoa 7, Facultad de Medicina (Edificio Entrepabellones 7 y 8), 28040 Madrid, Spain

LandS/Lab2PT - Landscape, Heritage and Territory Laboratory (FCT UID/AUR/04509/2013; FEDER COMPETE POCI-01-0145-FEDER-007528) and Earth Sciences Department, School of Sciences, University of Minho, 4710-057 Braga, Portugal

Graduate School of Oceanography, University of Rhode Island, Narragansett, RI 02882, USA