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Table 2 Chemical and isotopic composition of fumarolic gas sampled at the point S in Kamiyuba 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 *CO2/H2S H2O CO2 H2S SO2 He H2 O2 N2 CH4 Ar δDSMOW δ18OSMOW δDSMOW **AET
yy/mm/dd °C Molar ratio μmol/mol μmol/mol μmol/mol μmol/mol μmol/mol μmol/mol μmol/mol μmol/mol μmol/mol μmol/mol H2O H2O H2 °C
2013/5/7 98.1   978,600 20,200 500 12.2 0.0609 415 0.000 287 1.47 0.735 − 52 − 6.8 − 636 91
2013/6/4 96.5   986,500 12,540 396 7.00 0.0536 343 0.000 235 1.32 0.551 − 54 − 7.1 − 638 90
2013/7/9 97.5   985,400 13,770 381 9.50 0.0392 302 0.000 187 1.23 0.519 − 52 − 7.4 − 637 91
2013/8/28 97.3   983,000 15,940 499 5.90 0.0409 341 0.000 203 1.33 0.701 − 47 − 5.9 − 630 95
2013/10/2 96.5   989,800 9410 365 9.00 0.0276 289 0.000 144 1.06 0.472 − 51 − 6.2 − 636 91
2013/11/29 96.5   991,900 7210 465 0.50 0.0279 252 0.000 142 1.21 0.292 − 49 − 6.0 − 634 93
2014/1/28 96.9   990,600 8300 607 19.3 0.0349 277 0.000 155 1.39 0.363 − 50 − 5.9 − 631 95
2014/4/25 98.2   988,900 10,250 429 19.4 0.0267 286 0.000 153 1.31 0.543 − 50 − 6.0 − 629 96
2014/5/30 97.1   988,700 10,340 473 10.5 0.0279 273 0.000 155 1.21 0.637 − 48 − 5.8 − 631 94
2014/7/4 97.2   989,100 9890 529 6.20 0.0395 273 0.147 150 1.23 0.567 − 51 − 6.1 − 633 93
2014/8/6 97   989,900 9200 430 9.50 0.0263 277 0.122 141 1.34 0.426 − 49 − 5.9 − 627 98
2014/9/12 97.4   988,500 10,430 586 18.4 0.0367 314 0.000 174 1.70 0.534 − 50 − 6.0 − 655 76
2014/10/15 97.1 23 986,900 12,160 484 18.0 0.0466 233 0.141 171 1.66 0.446 − 53 − 6.7 − 666 68
2014/11/19 97 23 988,600 10,210 868 17.6 0.0405 205 0.307 127 1.24 0.403 − 49 − 5.9 − 630 95
2014/12/19 97.2 21 989,300 9850 517 20.9 0.0283 177 0.347 129 1.42 1.05 − 49 − 6.0 − 628 97
2015/1/20 98.6 20 990,100 8960 674 23.8 0.0231 159 0.314 117 1.15 0.338 − 48 − 5.8 − 631 94
2015/2/16 97.3 19 988,600 10,550 517 8.50 0.0413 198 0.000 143 1.56 0.423 − 49 − 5.8 − 624 100
2015/3/31 98.7 19 991,100 8170 398 20.2 0.0315 167 0.000 113 1.28 0.320 − 49 − 5.7 − 611 111
2015/4/24 97.6 20 990,200 8890 577 11.7 0.0381 184 0.146 128 1.32 0.310 − 50 − 6.2 − 609 113
2015/5/8 97.3 31 984,000 14,920 668 15.0 0.0645 183 0.000 238 1.24 0.426 − 52 − 6.3 − 616 108
2015/5/11 97.6 38 981,400 17,600 552 7.80 0.0831 190 0.000 280 1.18 0.466 − 54 − 6.8 − 564 154
2015/5/19 96.6 47 973,300 24,540 1550 40.9 0.106 236 0.625 363 1.21 0.603 − 53 − 6.5 − 589 131
2015/6/2 96.2 54 975,100 23,830 481 14.6 0.0969 227 0.261 323 1.11 0.722 − 48 − 5.9 − 607 114
2015/6/16 97.1 53 975,200 23,820 477 9.20 0.0878 234 0.394 299 1.10 0.493 − 49 − 6.0 − 616 106
2015/6/30 97.8 59 975,300 23,520 605 19.1 0.0835 216 0.000 291 1.13 0.586 − 47 − 5.5 − 606 114
2015/7/14 98.1 48 977,400 21,520 511 3.00 0.0930 280 0.256 295 1.44 0.676 − 55 − 7.2 − 606 117
2015/7/28 97 41 978,600 20,320 611 9.60 0.0663 245 0.033 236 1.35 0.509 − 54 − 7.1 − 595 126
2015/8/20 97.8 37 978,500 20,270 641 22.4 0.0540 300 0.000 255 1.47 0.556 − 50 − 6.3 − 598 123
2015/9/11 96.6 35 981,600 17,400 507 6.70 0.0493 300 0.021 226 1.37 0.542 − 51 − 6.7 − 618 106
2015/10/6 97.6 33 966,200 31,130 1820 38.0 0.0855 422 0.000 406 2.31 1.12 − 60 − 8.0 − 607 118
2015/11/11 97.7 31 983,300 14,460 614 5.60 0.0562 315 173 1160 1.54 10.9 − 53 − 6.7 − 603 119
2015/12/8 96.6 28 981,700 17,360 474 10.4 0.0424 272 1.63 225 1.47 1.83 − 49 − 6.1 − 608 114
2016/1/8 96.7 29 982,300 16,700 583 6.90 0.0478 231 1.10 188 1.37 0.381 − 63 − 8.7 − 595 129
2016/1/28 97.9 29 979,900 18,900 656 11.3 0.0627 268 0.710 241 1.86 0.699 − 53 − 6.9 − 609 114
2016/2/15 95.5 29 990,700 8510 454 6.20 0.0434 209 0.106 154 1.20 0.347 − 50 − 6.4 − 607 114
2016/3/2 95.5 28 982,600 16,320 647 15.7 0.0482 211 0.035 193 1.44 0.673 − 55 − 7.4 − 611 113
2016/4/8 97.6 28 985,000 14,090 561 13.7 0.0459 207 0.000 174 1.41 0.620 − 50 − 6.8 − 609 113
2016/5/13 97.3 26 986,300 12,830 559 8.10 0.0388 169 0.319 160 1.23 0.708 − 51 − 6.9 − 605 116
2016/6/3 97.6 23 986,300 12,820 578 1.60 0.0376 178 0.343 161 1.32 0.503 − 51 − 6.6 − 606 116
2016/7/5 97.4 23 983,700 15,110 744 3.50 0.0484 204 0.089 203 1.91 0.640 − 57 − 7.7 − 610 114
2016/8/5 96.9 26 989,600 9520 582   0.0415 173 0.019 154 1.50 0.451 − 51 − 6.7 − 607 115
2016/9/5 97.4 21 989,200 10,070 503 8.00 0.0305 120 0.018 129 1.30 0.443 − 49 − 6.3 − 613 109
2016/10/7 97.2 22 989,000 10,190 422 10.6 0.0347 214 0.584 135 1.35 0.451 − 51 − 7.4 − 615 109
2016/10/19 96.6 21 990,300 8960 445 13.5 0.0293 207 0.568 115 1.19 0.387 − 47 − 6.3 − 610 111
2016/11/4 97.5 22 988,800 10,300 490 7.70 0.0369 231 1.56 146 1.44 0.579 − 49 − 5.8 − 605 116
2016/12/7 97.2 21 989,800 9370 396 9.00 0.0369 258 0.064 150 1.58 1.15 − 48 − 5.7 − 612 109
2017/1/11 96.8 22 982,400 16,360 766 16.7 0.0529 257 0.033 207 2.49 0.663 − 51 − 6.6 − 611 112
2017/2/6 96.7 20 976,400 21,970 1010 13.0 0.0579 361 0.026 287 3.36 1.06 − 59 − 7.5 − 618 108
2017/3/9 96.7 21 980,700 17,670 1100 14.2 0.0552 239 0.236 230 2.67 1.07 − 56 − 7.3 − 626 101
2017/4/10 92.4 20 983,000 15,160 1380 44.9 0.0472 154 0.434 222 2.76 1.07 − 56 − 7.5 − 625 101
2017/5/10 97.2 23 984,000 14,730 905 5.40 0.0505 196 0.046 203 2.55 0.674 − 57 − 7.4 − 622 104
2017/6/10 96.5 21 975,300 22,640 1470 63.3 0.0772 227 0.000 307 3.81 1.14 − 58 − 7.4 − 604 120
2017/7/4 97.6 23 983,100 15,820 744 4.60 0.0461 107 0.168 203 2.17 0.696 − 56 − 7.0 − 589 132
2017/8/1 96.8 26 978,500 20,250 844 18.3 0.0653 139 0.121 278 2.47 0.820 − 56 − 7.4 − 584 137
2017/9/2 96.4 26 970,400 28,060 1000 17.2 0.0858 155 0.166 364 2.96 1.12 − 58 − 7.7 − 606 118
2017/10/4 96.8 25 973,000 25,220 1010 25.0 0.0716 73.5 26.7 612 2.48 6.49 − 55 − 7.1 − 599 123
2017/11/7 97.2 28 983,800 15,140 548 7.50 0.0473 255 0.000 215 1.64 0.599 − 54 − 6.9 − 618 107
2017/12/5 97.0 27 986,500 12,520 548 30.7 0.0390 258 0.000 186 1.51 0.547 − 49 − 6.0 − 605 116
2018/1/9 96.4 29 988,300 10,910 435 3.50 0.0361 165 0.107 148 1.32 0.403 − 46 − 5.1 − 585 132
2018/2/5 96.7 24 979,200 19,670 775 7.20 0.0604 126 0.040 262 2.40 0.954 − 58 − 7.6 − 589 133
  1. *Ratio determined by “Gas detector tubes system”
  2. **Apparent equilibrium temperature defined between δD of H2O and H2