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Fig. 16 | Journal of Applied Volcanology

Fig. 16

From: Effects of eruption source parameter variation and meteorological dataset on tephra fallout hazard assessment: example from Vesuvius (Italy)

Fig. 16

Hazard maps for different column height. Contour lines represent the probability of loading equal to 300 kg/m2. We used ECMWF Era-Interim winds dataset and settling velocity distribution VSET-2008. As can be noted, keeping constant the total erupted mass, and in the investigated range of column heights, the higher the column, the smaller the hazard area. This effect is related to the larger dispersal of the mass with the increasing of the column height. In particular, the area enclosed within the 5 % probability contours is: 1175, 1115, 1045, 975, 905 and 840 km2, respectively, for column height 12, 14, 16, 18, 20 and 22 km. In the background are reported the “Red Zone” (hazard from pyroclastic flows and lahars) and the “Yellow Zone” (hazard from ash fallout) of the actual Emergency Plan of Vesuvius (DPC 2015; Regione Campania 2015)

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