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Table 3 Water-soluble species on volcanic ash samples of the 2018–2019 eruption at Kuchinoerabujima Volcano

From: Influence of hydrothermal recharge on the evolution of eruption styles and hazards during the 2018–2019 activity at Kuchinoerabujima Volcano, Japan

Sample ID Date of eruption F* Cl* SO4* Na* NH4* K* Mg* Ca* Cl/SO4** (Na + K)/Cl** Ca/SO4**
18-Keb02-4 21st Oct. 2018 354.2 2484.0 3566.5 584.3 7.1 80.3 98.0 2631.3 1.89 0.39 1.77
18-Keb03-1 26th Oct. 2018 354.9 1719.3 19,684.7 437.0 0.0 56.9 58.9 8529.4 0.24 0.42 1.04
18-Keb07-2 5th Nov. 2018 325.7 1128.1 12,273.8 315.4 0.0 43.6 45.0 5429.1 0.25 0.47 1.06
18-Keb09 12th Nov. 2018 387.7 2021.8 8658.6 576.8 0.0 85.7 79.1 4469.4 0.63 0.48 1.24
18-Keb12-1 20th Nov. 2018 244.8 570.4 7846.1 272.5 0.0 17.5 27.1 3309.1 0.20 0.76 1.01
18-Keb15 6th Dec. 2018 479.8 2572.0 22,610.9 479.3 0.0 81.4 90.9 10,036.3 0.31 0.32 1.06
18-Keb17 18th Dec. 2018 466.6 2315.0 79,124.1 2135.3 16.5 120.6 479.6 29,034.2 0.08 1.47 0.88
18-Keb19-1 28th Dec. 2018 127.5 1815.9 29,738.1 1099.9 0.0 183.7 416.7 10,845.4 0.17 1.03 0.87
19-Keb03-3 17th Jan. 2019 235.1 724.5 82,760.6 434.7 0.0 85.4 381.3 29,152.4 0.02 1.03 0.84
19-Keb06 20th Jan. 2019 134.8 4725.5 55,724.3 684.0 0.0 57.2 940.2 21,172.4 0.23 0.23 0.91
19-Keb09-2 29th Jan. 2019 57.8 1195.3 23,466.3 850.1 0.0 93.5 352.9 7851.9 0.14 1.17 0.80
  1. *in mg/kg. **In molar ratio