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Table 5 Geospatial analysis of urban surfaces in case study locations. N/a indicates that no grid cells fell within these thickness ranges

From: Tephra clean-up after the 2015 eruption of Calbuco volcano, Chile: a quantitative geospatial assessment in four communities

Location Area of exposed assets (m2) Area sampled (m2) Sampled area that is impervious surface (m2) Percentage of total area that is impervious surface (%) Extrapolated area that is impervious surface (m2) Total area of road (m2)
Ensenada 1–5 mm 20,000 0 n/a n/a n/a 20,000
Ensenada > 5–10 mm 27,000 0 n/a n/a n/a 27,000
Ensenada > 10–20 mm 14,000 0 n/a n/a n/a 14,000
Ensenada > 20–30 mm 14,000 0 n/a n/a n/a 14,000
Ensenada > 30–60 mm 60,000 0 n/a n/a n/a 60,000
Ensenada > 60–100 mm 99,000 0 n/a n/a n/a 99,000
Ensenada > 100–150 mm 146,000 51,000 1000 2 3000 70,000
Ensenada > 150–200 mm 5,163,000 1,305,000 26,000 2 102,000 146,000
Ensenada > 200–300 mm 878,000 236,000 1000 0.4 3000 28,000
Ensenada > 300 mm 15,000 0 n/a n/a n/a 15,000
VLA 4,220,000 2,010,000 196,000 10 412,000 1,175,000
SMA 7,530,000 2,550,000 451,000 18 1,330,000 1,467,000
JDA 4,910,000 2,150,000 288,000 13 658,000 942,000