Runout modelling of gravity-induced pyroclastic density currents at Stromboli volcano (Italy)

Teresa Salvatici (a), Stefano Morelli (a) Federico Di Traglia (a) & Alessio Di Roberto (b)
(a) Department di Science della Terra, Università di Firenze, Via La Pira 4, 50121, Firenze (Italy), Firenze, Italy. E-mail: Teresa.salvatici@unifi.it (b) Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Pisa, Via della Faggiola 32, 56126, Pisa (Italy)

Gravity-induced pyroclastic density currents (PDCs) at Stromboli volcano were investigated by means numerical and empirical modelling. With the aim of testing the suitability of landslide numerical model DAN-3D and empirical models are used related to gravity-induced PDCs, in particular this work presents the results of the back analysis of three events occurred on 1906, 1930 and 1944 at Stromboli volcano. These two methods were able to reproduce the extension and the order of magnitude of the thickness of the PDCs reported in the literature. The best results of DAN-3D models were obtained using a Voellmy model with frictional coefficient of f = 0.19 and a turbulence parameter ξ = 1000 m/s. The mobility terms, find with the numerical model, are compared with empirical data of literature of the similar events.

Pyroclastic density currents, DAN-3D, empirical methods