Fig. 8
From: Effusive crises at Piton de la Fournaise 2014–2015: a review of a multi-national response model
a Relationships between erupted magma volume (from MIROVA) and total SO2 emissions (from NOVAC network) for four eruptions of Piton de la Fournaise (Coppola et al., submitted). Dashed lines are the theoretical relationships for initial sulfur content in the melt of 10, 100, 1000 ppm. Total SO2 emissions retrieved during short-lived eruptions (June 2014 and July 2015) were strongly underestimated because a significant part of the eruptions occurred at night. b Temporal evolution of erupted lava (bulk) volumes for the May 2015 and c August–October 2015 eruption. The cumulative volumes were derived from MODIS (red lines) and from SO2 flux, by assuming different sulfur contents in the magma (gray scale symbols). The yellow stars indicate the final lava flow volume obtained after each eruption from photogrammetry and InSAR analysis (Peltier et al. 2016). Note how the three methods converge when considering the lower estimates provided by MIROVA data and a low pre-eruptive S content (~600 ppm) for Piton de la Fournaise magmas. During each eruption, because of the uncertainty of both MIROVA and SO2-derived cumulative volumes, such comparisons were carried out in real-time to derive the mostly likely-curve on the basis of convergence, which was only achieved if adopted a low pre-eruptive S content