Fig. 4From: Behavior of magmatic components in fumarolic gases related to the 2018 phreatic eruption at Ebinokogen Ioyama volcano, Kirishima Volcanic Group, Kyushu, JapanChanges in the concentration of CO2 (a), H2S (b), SO2 (c), He (d), H2 (e), O2 (f), N2 (g), CH4 (h), and Ar (i). The vertical axis is calibrated as the logarithm of ppm (µmol/mol) concentration. Red histogram and vertical lines have the same significance as in Fig. 3Back to article page