Fig. 7
From: Framework for developing volcanic fragility and vulnerability functions for critical infrastructure
Wastewater treatment plant ash impact histogram and fragility functions. a Histogram of available post-eruption impact data classified by IS for 1–4, 5–25, and 26–50 mm tephra thickness bins. b Derived fragility functions for wastewater treatment plant sites (excluding the influence of tephra entering and being transported through pipe networks) showing probability of equalling or exceeding each IS vs tephra thickness. Values for tephra thickness > 50 mm are extrapolated