Multi-Parametric Field Experiment Links Explosive Activity and Persistent Degassing at Stromboli

Visually unattainable magmatic processes in volcanic conduits, such as degassing, are closely linked to eruptive styles at the surface, but their roles not completely identified and understood. To gain insights, a multi-parametric experiment Stromboli volcano (Aeolian Islands, Italy) was installed July 2016 focusing on normal explosive activity persistent degassing. During this experiment, gas-dominated (type 0) particle-loaded 1) explosions, already defined by other studies, were clearly identified. A FLIR thermal camera, an Ultra-Violet SO₂ camera scanning Differential Optical Absorption Spectroscopy deployed record pyroclast SO 2 masses emitted during individual well fluxes, respectively. An ASHER instrument also order collect ash fallouts measure grain size distribution of samples. measurements confirm that degassing far greater than explosions. Further, we found data could be characterized two periods. In first period (25–27 July), mainly type 0 high velocity jets. Pyroclast mass fluxes relatively low (280 kg/event average), while (274 t/d average). second (29–30 1 almost ten times higher (2,400 gas significantly lower (82 Ash characterization indicates explosions fragments larger proportion non-juvenile material compared fragments. This week-long field suggests that, least within short time periods, Stromboli’s can associated with levels particles accompanying events depends volume degassed magma cap sitting head column. make classic aside from true state volcano. Instead, indicative highly charged (with gas) system. We thus suggest deep processes, slug formation rapidly influence superficial behavior conduit, modulating presence or absence explosion/fragmentation level.