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Table 1 Chemical and isotopic composition of fumarolic gas sampled at the point N 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 *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 95.6   974,800 20,600 4020 92.7 0.0678 209 0.00 251 0.668 0.670 − 53 − 7.7 − 579 141
2013/6/4 97.5   981,400 15,160 3040 105 0.0305 158 0.00 173 0.455 1.664 − 55 − 7.2 − 608 115
2013/7/9 96.8   988,200 9360 2190 39.1 0.0316 123 0.00 107 0.377 0.296 − 51 − 6.8 − 619 105
2013/8/28 97.5   989,300 8320 2140 8.2 0.0265 110 0.00 88 0.337 0.291 − 47 − 5.7 − 618 105
2013/10/2 97.0   986,400 9000 3660 44.8 0.0581 46 0.00 840 0.681 14.3 − 58 − 7.0 − 626 102
2013/11/29 96.6   987,900 8610 3170 29.3 0.0285 101 0.31 236 0.576 2.06 − 62 − 8.7 − 619 109
2014/1/28 96.8   988,400 8610 2790 75.9 0.0260 81 0.41 85 0.461 0.169 − 54 − 6.6 − 625 101
2014/4/25 96.9   992,900 5160 1810 24.4 0.0104 61 1.20 50 0.222 0.252 − 45 − 5.3 − 620 102
2014/5/30 98.7   991,500 6160 2120 36.8 0.0164 101 0.00 78 0.548 0.355 − 43 − 4.7 − 622 100
2014/7/4 97.2   991,800 6140 1940 37.1 0.0190 43 0.31 76 0.388 0.347 − 50 − 5.9 − 626 99
2014/8/6 96.3   991,200 6480 2170 25.3 0.0263 45 0.00 89 0.488 0.452 − 50 − 5.7 − 615 108
2014/9/12 96.8   990,300 7140 2350 73.7 0.0309 60 0.47 106 0.591 0.488 − 50 − 6.1 − 627 98
2014/10/15 96.8 3.5 988,600 8910 2260 76.7 0.0320 70 0.44 116 0.641 0.600 − 55 − 7.0 − 662 72
2014/11/19 97.1 3.3 991,500 6420 1920 33.6 0.0169 31 0.50 64 0.376 0.289 − 50 − 6.0 − 654 77
2014/12/19 96.8 3.4 991,800 6110 1960 18.2        − 51 − 6.3 − 675 61
2015/1/20 97 3.2 992,000 5820 1950 27.9 0.0151 31 18.82 126 0.364 1.03 − 51 − 6.4 − 625 100
2015/2/16 96.5 3.1 990,800 6380 2370 40.4 0.0217 19 0.12 384 0.537 5.86 − 57 − 7.4 − 595 128
2015/3/31 97.2 3.4 989,700 5940 2260 44.0 0.0294 19 249 1750 0.522 29.9 − 60 − 8.4 − 602 123
2015/4/24 95.9 3.6 984,400 6640 3550 34.9 0.0591 36 3.76 5240 0.408 90.4 − 67 − 10.2 − 581 144
2015/5/8 95.6 4.4 988,700 8670 2400 29.0 0.0365 24 0.00 133 0.373 0.364 − 56 − 7.2 − 600 123
2015/6/2 96.1 9.8 979,300 18,250 2150 68.1 0.0718 26 0.09 230 0.276 0.477 − 52 − 6.7 − 607 116
2015/6/16 96.8 9.0 976,000 21,180 2560 30.5 0.0777 30 0.18 244 0.306 0.547 − 52 − 6.8 − 589 131
2015/7/14 96.6 6.8 971,600 24,110 3950 70.0 0.0816 49 0.19 247 0.313 0.647 − 51 − 6.7 − 611 112
2015/7/28 96.3 5.8 979,300 16,980 3480 37.8 0.0657 45 0.05 199 0.255 0.402 − 55 − 7.4 − 613 112
2015/8/20 96.1 4.6 977,200 18,160 4360 33.2 0.0633 46 0.05 204 0.312 0.441 − 55 − 7.2 − 605 118
2015/9/11 96.1 4.4 983,400 13,000 3420 32.7 0.0444 47 0.08 146 0.272 0.316 − 56 − 7.6 − 576 144
2015/10/6 97.2 4.3 984,300 11,990 3490 34.4 0.0360 35 0.05 130 0.257 0.406 − 55 − 7.3 − 608 116
2015/11/11 96.9 4.1 990,100 6590 3150 20.3 0.0307 33 0.07 106 0.252 0.348 − 54 − 7.1 − 602 120
2015/12/8 96.7 4.3 985,300 11,300 3160 29.8 0.0420 54 2.94 187 0.503 1.378 − 58 − 8.2 − 609 116
2016/1/8 96 3.3 983,000 12,580 4190 27.6 0.0339 48 1.51 198 0.517 0.997 − 52 − 6.5 − 579 140
2016/1/28 97.7 3.7 988,400 8290 3160 20.8 0.0260 32 0.36 99 0.367 0.364 − 66 − 8.9 − 612 116
2016/2/15 96.5 3.9 982,200 13,850 3810 16.7 0.0254 40 0.08 105 0.399 0.317 − 63 − 8.0 − 616 112
2016/3/2 96.5 3.8 986,800 9540 3470 36.5 0.0252 35 0.20 113 0.346 0.709 − 62 − 8.1 − 617 110
2016/4/8 96.5 3.2 989,000 7780 3050 74.1 0.0227 35 0.09 97 0.419 0.585 − 64 − 8.8 − 613 114
2016/5/13 96.5 3.3 988,900 7520 3280 29.4 0.0173 30 0.15 276 0.394 4.213 − 65 − 8.1 − 619 110
2016/6/3 96.7 3.3 990,900 6190 2710 19.9 0.0170 26 4.09 127 0.392 1.187 − 66 − 8.4 − 615 114
2016/7/5 97.7 3.1 993,300 3640 2980 15.9 0.0135 25 0.06 78 0.353 0.625 − 62 − 8.3 − 618 109
2016/8/5 96.9 3.7 994,000 3480 2320 29.3 0.0160 25 0.11 108 0.380 0.958 − 63 − 8.1 − 613 114
2016/9/5 97 3.2 991,900 5390 2610 26.4 0.0155 53 0.07 62 0.485 0.283 − 61 − 8.5 − 609 117
2016/10/7 96.9 2.7 990,900 5590 2670 9.5 0.0153 29 123 685 0.553 9.71 − 68 − 9.7 − 611 117
2016/10/19 97.2 2.7 992,300 5080 2450 23.9 0.0128 57 0.15 54 0.495 0.236 − 57 − 7.9 − 634 95
2016/11/4 96.9 2.9 993,300 4120 2390 25.7 0.0123 58 0.25 55 0.507 0.229 − 56 − 7.6 − 615 110
2016/12/7 96.4 3.1 987,500 8080 3870 90.2 0.0218 87 3.71 399 0.856 6.15 − 64 − 9.1 − 616 112
2017/1/11 96.3 3.2 992,600 5030 2210 56.9 0.0097 53 0.04 49 0.537 0.221 − 59 − 8.2 − 613 112
2017/2/6 95.9 2.9 991,700 5430 2670 92.9 0.0134 60 0.18 59 0.688 0.259 − 58 − 7.8 − 634 95
2017/3/9 95.7 2.8 993,300 4210 2340 81.7 0.0126 53 0.67 52 0.579 0.256 − 55 − 7.4 − 626 101
2017/4/10 96.2 2.5 993,900 3400 2540 45.8 0.0100 47 0.31 51 0.591 0.268 − 59 − 8.0 − 624 103
2017/5/10 96.3 3.1            − 84 − 12.4 − 617 118
2017/6/10 96.1 3.1 982,400 11,400 5640 267 0.0359 101 0.10 144 1.396 0.749 − 63 − 8.8 − 606 120
2017/7/4 96.4 3.2 991,800 5550 2480 22.3 0.0173 45 0.01 65 0.612 0.240 − 56 − 7.4 − 566 153
2017/8/1 96.5 3.5 991,500 6210 2160 17.6 0.0156 37 0.37 72 0.493 0.248 − 54 − 7.0 − 609 115
2017/9/2 96.9 3.7 990,200 7250 2360 22.6 0.0247 45 0.09 105 0.558 0.368 − 57 − 7.7 − 588 133
2017/10/4 95.7 4.0            − 72 − 11.0 − 535 192
2017/11/7 96.8 3.9 988,900 8190 2660 19.4 0.0258 48 0.05 154 0.715 1.04 − 67 − 9.5 − 581 144
2017/12/5 96.0 3.9 991,000 6430 2380 25.3 0.0199 41 0.29 87 0.656 0.283 − 61 − 8.5 − 609 117
2018/1/9 95.5 3.7            − 77 − 12.2 − 604 127
2018/2/5 97.0 3.9 989,400 7610 2860 3.00 0.0220 70 0.17 89 0.862 0.360 − 62 − 8.8 − 603 122
  1. *Ratio determined by “Gas detector tubes system”
  2. **Apparent equilibrium temperature defined between δD of H2O and H2