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

Ohba, Takeshi; Yaguchi, Muga; Nishino, Kana; Numanami, Nozomi; Daita, Yasushi; Sukigara, Chiho; Ito, Masanori; Tsunogai, Urumu

doi:10.1186/s40623-019-1027-5

Earth, Planets and Space

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	δD_SMOW	δ¹⁸O_SMOW	δD_SMOW	**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

*Ratio determined by “Gas detector tubes system”
**Apparent equilibrium temperature defined between δD of H₂O and H₂

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