Riccardo Barzaghi (*), Anna Maria Marotta (**,°), Raffaele Splendore (**) & Alessandra Borghi (*)
(*) Politecnico of Milan, DIIAR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
(**) Department of Earth Sciences, Section of Geophysics, University of Milan, L. Cicognara 7, 20129 Milano, Italy.
(°) CNR-IDPA, Milano, Italy.