Abstract
High possibility of liquefied and fluidized flow from reworked volcaniclastics is clarified by grain-size distribution combined with settling velocity. Samples are obtained from “mudflow” deposits of the Pliocene Ohta and Souri tephra beds. Grain size of autofluidization in these samples can be calculated based on the comparison between superficial fluid velocity at minimum fluidization and superficial fluid escape velocity. Autofluidization can occur when particle diameter is finer than 0.4mm in the Ohta tephra, and finer than 0.7mm in the Souri tephra. However, particles finer than 0.001mm in diameter have low possibility of autofluidization because of their cohesion. Mean particle diameters of all samples are satisfy the size range of autofluidization, suggesting the particles in those deposits must be supported by fluidization.
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