Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/10298
Authors: Sandri, L.* 
Costa, A.* 
Selva, J.* 
Tonini, R.* 
Macedonio, G.* 
Folch, A.* 
Sulpizio, R.* 
Title: Beyond eruptive scenarios: assessing tephra fallout hazard from Neapolitan volcanoes
Journal: Nature Scientific Reports 
Series/Report no.: /6 (2016)
Issue Date: Apr-2016
DOI: 10.1038/srep24271
Keywords: Eruptive scenarios
Tephra fallout hazard
Power law
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk 
Abstract: Assessment of volcanic hazards is necessary for risk mitigation. Typically, hazard assessment is based on one or a few, subjectively chosen representative eruptive scenarios, which use a specific combination of eruptive sizes and intensities to represent a particular size class of eruption. While such eruptive scenarios use a range of representative members to capture a range of eruptive sizes and intensities in order to reflect a wider size class, a scenario approach neglects to account for the intrinsic variability of volcanic eruptions, and implicitly assumes that inter-class size variability (i.e. size difference between different eruptive size classes) dominates over intra-class size variability (i.e. size difference within an eruptive size class), the latter of which is treated as negligible. So far, no quantitative study has been undertaken to verify such an assumption. Here, we adopt a novel Probabilistic Volcanic Hazard Analysis (PVHA) strategy, which accounts for intrinsic eruptive variabilities, to quantify the tephra fallout hazard in the Campania area. We compare the results of the new probabilistic approach with the classical scenario approach. The results allow for determining whether a simplified scenario approach can be considered valid, and for quantifying the bias which arises when full variability is not accounted for.
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