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 Figure 17. Constructing a laterally directed-blast hazard zone based on the area of distribution of two large historical events and a given direction of precursory deformation. The 35 km-radius zone encompasses an area of danger principally from the lateral blast, while the smaller 15 km radius encloses an area of possible impact of ballistic ejecta, adapted from Crandell and Hoblitt (1986). |