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Progress in Earth and Planetary Science
Fig. 7 | Progress in Earth and Planetary Science

Fig. 7

From: Sedimentation process of ashfall during a Vulcanian eruption as revealed by high-temporal-resolution grain size analysis and high-speed camera imaging

Fig. 7

Temporal variation in Md and Sd of the subpopulations. Blue, orange, and green lines show subpopulations #1, #2, and #3, respectively. a Md of the subpopulations. Solid lines show the expected sizes of falling ash particles with densities of 2700 kg m−3 for FF (form factor) of 0.56. Error bars indicates the standard deviation of particle size. b Sd of the subpopulations. c Fraction of each subpopulation in the GSDs. Vertical dashed gray lines represent onset times of the two Vulcanian eruptions. Left side gray shade indicates collection time of sj0326-08 (11:04–11:05) in which the aggregation became effective to sedimentation. Right side gray shade indicates collection time of sj0326-16 (11:37–11:42) in which the trimodal GSD started to appear

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