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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