Fig. 4

Estimated plume for event 17. A plan view (a) and cross-sections (b) of the estimated plumes from event 17. Modelled plume heights in standard atmospheric conditions are plotted with red dashed lines, and those with measured atmospheric conditions are plotted with blue dashed lines. The plan view is plotted onto a digital elevation map of the Mt. Redoubt area. The cross-section is plotted along the black line in (a), that is the direction of the prevailing wind during the eruption. Observed plume heights (grey dashed line) were measured with satellite imagery (Webley et al. 2013) and Doppler radar (Schneider and Hoblitt 2013)