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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