Monitoring the time-averaged discharge rates, volumes and emplacement style of large lava flows by using MIROVA system: the case of the 2014-2015 eruption at Holuhraun (Iceland) - Coppola, Diego; Barsotti, Sara; Cigolini, Corrado; Laiolo, Marco; Pfeffer, Melissa; Ripepe, Maurizio (Annals of Geophysics, 2019)