Fig. 3

Example of ash distribution forecasts for a hypothetical short-duration Ruapehu eruption at 0500UT on 8 August 2016, with a 12.5 km column height and a total volume of 0.1 km³. Colours and grey 0.01 mm contour are from HYSPLIT, black 0.01, 0.1, 1 and 10 mm contours from ASHFALL. The ASHFALL distribution is entirely based on the expected wind at Ruapehu, whereas HYSPLIT forecasts that a significant amount of ash will be deposited to the south and west under the influence of a complex wind pattern