Acknowledgments
This research has benefited from funding provided by the Italian Presidenza del Consiglio dei Ministri - Dipartimento della Protezione Civile (DPC). Scientific papers funded by DPC do not represent its official opinion and policies.
This research has benefited form founding provided by Italian Ministero dell’Istruzione, dell’Università e della Ricerca PRIN 2008. The authors are grateful to Chiara D’Ambrogi for kindly sharing heat flow and gravimetric data.