Figure 3
From: The size range of bubbles that produce ash during explosive volcanic eruptions
Results of grain size distribution (GSD) analyses for the examined samples. (a) Mount St. Helens 1980 distal samples (157–634 km from source), with GSD carried out using a Malvern Instruments Mastersizer 2000 at the University of Cambridge; (b) total grain size distribution (TGSD) of the fall deposit from Durant et al. (2009); (c) GSD of the Fuego October 14, 1974 samples, obtained through standard sieving techniques, all collected within 60 km of source (there are no data available for sample VF74-68); (d) TGSD of the fall deposit from Rose and Durant (2009a2009b). GSDs of the samples used in this study reflect the loss of larger pyroclasts with distance from source.