Anna Maria Marotta (*,°), M. Iole Spalla (**,°) & Manuel Roda (***)
(*) Department of Earth Sciences "Ardito Desio", Section of Geophysics, University of Milan, Via L. Cicognara 7, 20129 Milano, Italia.
(**) Department of Earth Sciences, Section of Geology, University of Milan, Via L. Mangiagalli 34, 20134 Milano, Italia.
(***) Universiteit Utrecht, Faculty of Geosciences, Budapestlaan 4, 3584 CD Utrecht, The Netherlands.
(°) CNR-IDPA, Milano, Italia