Giulia Verdiani (a), Paolo Conti (a), Gianluca Cornamusini (a), Altair Pirro (a) & Guido Lavorini (b)
(a) Centre for GeoTechnologies of University of Siena, via Vetri Vecchi 34, 52027, San Giovanni Valdarno (AR), Italy. E-mail: verdiani4@unisi.it
(b) Regione Toscana, Settore Geologia, via di Novoli 26, 50100, Firenze (FI), Italy.