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Table 3 Chemical and isotopic composition of fumarolic gas sampled at the point C in Owakudani geothermal area, Hakone volcano, Japan

From: Time variations in the chemical and isotopic composition of fumarolic gases at Hakone volcano, Honshu Island, Japan, over the earthquake swarm and eruption in 2015, interpreted by magma sealing model

Date Temp H2O CO2 H2S SO2 HCl He H2 O2 N2 CH4 Ar δDSMOW δ18OSMOW δDSMOW *AET
yy/mm/dd °C μmol/mol μmol/mol μmol/mol μmol/mol μmol/mol μmol/mol μmol/mol μmol/mol μmol/mol μmol/mol μmol/mol H2O H2O H2 °C
2015/12/25 131.9 988,200 5640 2050 1730 2360 0.0163 4.68 0.763 64.3 0.195 0.763 − 30 1.4   
2016/6/7 124.4 991,100 4630 2240 1120 850 0.0148 1.88 0.210 52.2 0.161 0.151 − 31 0.6 − 307 482
2017/8/7 123 979,300 17,050 1340 2070 0 0.0488 1.32 1.55 188 0.0806 1.19 − 29 1.0 − 254 597
  1. *Apparent equilibrium temperature defined between δD of H2O and H2