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 |