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Fig. 11 | Earth, Planets and Space

Fig. 11

From: Influence of particle aggregation on the tephra dispersal and sedimentation from the October 8, 2016, eruption of Aso volcano

Fig. 11

Grain size-dependent terminal fall velocities of clasts at 0 and 10 km a.s.l. calculated using the numerical method of Walker et al. (1971). We used the average clast densities as a function of grain size (Additional file 7). Note that fine ash particles constituting accretionary pellets (AP) and aggregate shells of coated particles (CP) have terminal velocities up to several orders of magnitude greater than their individual fall velocities (yellow arrow). The fall velocities of larger core particles coated by fine ash are only slightly increased (green arrow)

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