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Total grain size distribution was estimated using field data and theoretical modelling. Isopleth maps of each size were constructed at intervals of 1 phi based on the detailed sampling and analysis of a subplinian deposit, TB-2—a product of the climatic phase of the 1986 eruption of the Izu-Oshima volcano, Japan. The umbrella spreading of the eruptive plume is analysed from isopleth maps based on...
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