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

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

Datea Temp (°C) pH ECb Composition (mg/L)
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
  1. aDates in 2016. bElectric conductivity (S/m)