Chronology of the 2015 eruption of Hakone volcano, Japan: geological background, mechanism of volcanic unrest and disaster mitigation measures during the crisis

Earth, Planets and Space

Table 2 Chemical composition of mud pool water formed in the 15-1 crater

Date^a	Temp (°C)	pH	EC^b	Composition (mg/L)
Date^a	Temp (°C)	pH	EC^b	Na	K	Mg	Ca	Fe	Al	Cl	SO₄	B
March 28	78.9	1.34	3.42	496	16.0	1210	1840	3500	2660	20,600	4700	220
May 13	93.1	1.76	2.02	139	12.6	178	384	3390	708	7180	1880	105
May 27	90.4	1.06	6.50	1060	156	1130	2490	4120	5740	38,400	3690	560
June 7	94.0	0.97	7.07	1120	138	1350	2650	3340	6060	39,100	3530	3030
June 27	94.6	0.79	7.05	74.1	21.7	220	225	2750	2630	20,500	1860	1670
July 14	94.4	0.05	37.4	206	54.4	636	478	5050	4770	65,300	2160	7620
July 28	95.2	< 0	> 20	439	134	744	970	2480	4580	87,600	3640	10,400