Fig. 11From: Volcanic plume measurements using a UAV for the 2014 Mt. Ontake eruptionTemporal variation of SO2/H2S ratio after the 2015 eruption (solid squares). The variation for the 1979 eruption is also plotted for comparison using the data from Ossaka et al. (1983) (solid circle) and Sugiura et al. (1997) (open circle)Back to article page