Table 4. Approximate road lengths (km) impacted by various ranges of tephra accumulation (see Fig. 2(b)). Road maps and classifications fr OpenStreetMap; isomass contours from AIST (2011).
From: Observations of tephra fall impacts from the 2011 Shinmoedake eruption, Japan
Tephra accumulation (kg/m2) | motorway | trunk | primary | secondary | tertiary | urban | rural | all roads |
|---|---|---|---|---|---|---|---|---|
0–0.5 | 59.7 | 139.0 | 238.0 | 196.3 | 347.9 | 1354.9 | 1342.1 | 3678.0 |
0.5–1 | 3.2 | 65.9 | 68.2 | 19.7 | 63.0 | 259.5 | 257.2 | 736.9 |
1–2 | 4.7 | 35.9 | 87.8 | 7.7 | 53.3 | 119.9 | 171.6 | 480.8 |
2–3 | 6.8 | 11.6 | 28.8 | 9.7 | 36.2 | 127.7 | 157.0 | 377.9 |
3–5 | 16.7 | 12.6 | 42.3 | 11.4 | 59.3 | 271.5 | 238.7 | 652.5 |
5–10 | 16.1 | 17.1 | 21.0 | 9.8 | 101.3 | 170.3 | 241.8 | 577.4 |
10–30 | 9.5 | 6.2 | 21.0 | 10.0 | 30.6 | 89.8 | 149.6 | 316.7 |
30–50 |  | 1.5 | 1.8 | 3.7 | 1.8 | 15.3 | 11.5 | 35.6 |
50–100 |  | 3.0 | 2.0 | 0.7 | 0.2 | 12.2 | 4.3 | 22.3 |
>100 | Â | Â | Â | Â | Â | 2.0 | Â | 2.0 |
Total | 116.8 | 292.8 | 511.0 | 269.0 | 693.6 | 2423.1 | 2573.8 | 6880.1 |