Marco Doveri (*), Andrea Cerrina Feroni (*), Simone Da Prato (*), Alessandro Ellero (*), Matteo Lelli (*), Luigi Marini (*), Giulio Masetti (*), Barbara Nisi (*) & Brunella Raco (*)
(*) Institute of Geosciences and Earth Resources, CNR, Pisa. E-mail: doveri@igg.cnr.it