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Table 2 Tephra clean-up thresholds used to assess tephra removal volumes for case study communities (adapted from Hayes et al. 2017)

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

Hayes et al. (2017) thresholds Ensenada thresholds, refined for this study
Thickness (mm) Surfaces for tephra removal Thickness (mm) Surfaces for tephra removal
1–10 Roads and airports 1–10 Roads
10–200 As above, with impervious surfaces from private properties included 10–100 As above, with impervious surfaces from private properties included
>  200 Tephra removed from all surfaces ≥100 All impervious surfaces and 30% of tephra from all other surfaces removed