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Table 5 The surfaces requiring tephra removal for an optimised clean-up and total tephra volume removed. Z = removal zone defined in this study

From: A model to assess tephra clean-up requirements in urban environments

Scenario Surfaces cleaned Area impacted (km2) Tephra volume removed (m3)
Roads Roofs Other impervious surfaces Vegetated areas
Thin distal     808 3.6 × 104
Thick distal   808 2.2 × 106
L1
Z1     65 1.3 × 104
Z2   69 3.1 × 105
Z3 12 8.6 × 105
Z4 58 5.9 × 107
L2
Z1     56 1.5 × 104
Z2   17 9.6 × 104
Z3 13 1.3 × 106
Z4 12 6.8 × 106