1. Researcher, Dept. of Civil and Environmental Engineering, Univ. of Florence, Via S.Marta 3, 50139 Firenze, Italy; presently, Center of Research and Advanced Education for Hydrogeological Risk Prevention (CERAFRI), Via XI Febbraio 2, 55040 Retignano di Stazzema, Lucca, Italy. E-mail: simona.francalanci@dicea.unifi.it
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Florence, Via S. Marta 3, 50139 Firenze, Italy (corresponding author). E-mail: luca.solari@dicea.unifi.it