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Table 1 Areas enclosed by each isomass contour. The right column is the total discharged mass estimated using the Hayakawa (1985) method for each contour line

From: Total mass estimate of the January 23, 2018, phreatic eruption of Kusatsu-Shirane Volcano, central Japan

Contour (g/m2) Area (m2) Thickness (m) Mass (t)
5 4.5 × 107 7 × 106 2.7 × 103 (min)
20 1.4 × 107 3 × 105 3.5 × 103
50 7.3 × 106 7 × 105 4.5 × 103
100 4.2 × 106 1 × 104 5.1 × 103
250 3.0 × 106 4 × 104 9.1 × 103
500 2.3 × 106 7 × 104 1.4 × 104
1000 1.1 × 106 1 × 103 1.4× 104
5000 6.6 × 105 7 × 103 4.0 × 104
10,000 4.5 × 105 1 × 102 5.4 × 104
30,000 1.9 × 105 4 × 102 7.1 × 104
45,000 1.6 × 105 7 × 102 9.4 × 104 (max)
60,000 6.8 × 104 2 × 101 8.7 × 104
7,00,000 1.3 × 104 1 8.5 × 104
12,60,000 7.5 × 102 2 1.2 × 104