Fig. 1: Observations made during of intermittent fountaining of the Fagradalsfjall volcano on 5 May 2021.
From: Near-surface magma flow instability drives cyclic lava fountaining at Fagradalsfjall, Iceland
Fountaining intervals are delineated by acoustic records (see Methods) shown in gray. A Infrared intensity at 2700 cm–1 (blue) and tracked fountain heights (black). B Temporal variation in retrieved column amounts (the integrated amount of gas in the instrument’s field of view per unit area) for H2O (blue points), CO2 (orange), SO2 (green), HCl (red), HF (purple), and CO (brown); H2O, CO2 and CO are corrected for atmospheric contributions (see “Methods”). C–H Molecular ratios of (C). H2O/CO2 (blue), (D) H2O/SO2 (green), (E) CO2/SO2 (orange), (F) SO2/HCl (red), (G) HCl/HF (purple), (H) CO2/CO (brown). Dots show individual measurements and the solid line the 30 s moving average. Note that all data in (C–H) are plotted using a linear scale.
