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Earth, Planets and Space
Fig. 9 | Earth, Planets and Space

Fig. 9

From: Variation of volcanic gas composition during the eruptive period in 2014–2015 at Nakadake crater, Aso volcano, Japan

Fig. 9

Correlation of gas concentration molar ratios on 25 February 2015. a correlation of CO2/SO2 molar ratio with SO2/H2S molar ratio, b correlation of H2O/SO2 molar ratio with SO2/H2S molar ratio, and c correlation of H2/SO2 molar ratio with SO2/H2S molar ratio. Grey circles show ratios obtained for high concentration peaks of SO2 ≥ 4 ppm, and white circles are ratios of low concentration peaks of SO2 > 4 ppm. Blue circle indicates the composition B’, and red and green dotted circles indicate the compositions A and B, respectively

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