Fig. 1From: Forecasting volcanic ash deposition using HYSPLITThe three ash size distributions used by ASHFALL, for Andesitic, basaltic and Rhyolitic volcanoes, compared to the ash size distribution used for VAAC modelling of ash as an aviation hazard. On the same particle diameter scale are also shown particle fall speeds for the three equations of Bonadonna et al. (1998) and the Ganser equationBack to article page