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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