Figure 6

(a) Connections between the magmatic environments defined through the zoning patterns of olivine crystals for the eruptive episodes of 2017. Each colored box represents a different magmatic environment. Arrows indicate the direction of magma transfer as recorded from olivine zoning. The number of arrows indicates the number of connections identified from the crystal zoning (normal or reverse); black arrows: normal zoning; red arrows: reverse zoning patterns. (b) Schematic cartoon of magma movements and deformation sources within the Mt. Etna plumbing system between June 2016 (i.e., at the end of the volcanic activity at VOR) and April 2017. The inflation sources (in red) are reported for the panels relative to T2a, T2b and T2c. The deflation sources (in blue) are reported in panels T2a (which is related to that of the May 2016 eruption at VOR) and in T3 for the 2017 eruptive activity. Magmatic environments have been also reported in the range of pressures defined from thermodynamic modeling available in literature¹⁰, whereas depth ranges have been constrained on the basis of the density model calculated for the basement underlying Mt. Etna³³.