The recent eruption of Stromboli in February–April 2007 offered a unique chance to test our
current understanding of processes driving the transition from ordinary (persistent
Strombolian) to effusive activity, and the ability of instrumental geophysical and geochemical
networks to interpret and predict these events. Here, we report on the results of two years of
in-situ sensing of the CO2/SO2 ratio in Stromboli's volcanic gas plume, in the attempt to put
constraints on the trigger mechanisms and dynamics of the eruption. We show that large …