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Table 1 List of parameters for classified ash particle size

From: Estimation of emission mass from an eruption plume for the Aso volcano eruption, on October 8, 2016, using a four-dimensional variational method

Index \( \phi \)-scale Density (kg/m3) D (mm)
1 − 4.00 1116 16.0000
2 − 3.58 1121 11.9501
3 − 3.16 1129 8.9253
4 − 2.74 1138 6.6661
5 − 2.32 1150 4.9788
6 − 1.89 1166 3.7185
7 − 1.47 1187 2.7773
8 − 1.05 1214 2.0743
9 − 0.63 1249 1.5493
10 − 0.21 1292 1.1571
11 0.21 1344 0.8642
12 0.63 1408 0.6455
13 1.05 1481 0.4821
14 1.47 1564 0.3600
15 1.89 1655 0.2689
16 2.32 1749 0.2009
17 2.74 1843 0.1500
18 3.16 1933 0.1120
19 3.58 2017 0.0837
20 4.00 2090 0.0625