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 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	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	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

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

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