Block-and-ash Flow
Block-and-ash Flow : Small-volume pyroclastic flow characterized by a large fraction of dense to moderately vesicular juvenile blocks in a matrix of the same composition. Such flows are typically associated with collapse of Vulcanian eruption columns or are produced from partial or complete collapse of unstable, viscous lava domes as they over-steepen at their fronts during active growth (e.g., as during the eruption of Unzen Volcano, Japan, in 1991). See: Freundt et al. (2000)
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