Abstract Volcanic eruptions have wide variety of styles, magnitude, and intensity. The products are also diverse in terms of chemistry, mineralogy, and granulometry. Here the relationship between eruption styles and products is summarized in terms of macroscopic flow and microstructure of magma. The eruption style strongly depends on the degassing history of ascending magma in conduit from depths. The conduit flow depends deeply on the physical properties, especially viscosity, of magma consisting of silicate melt, crystals, and gas that can change largely during eruption. Thus continuous monitoring of volcanic products is fundamental for further understanding and forecast of eruption, and are to some extent successful in obtaining time series data of mass ashfall rate and petrological characteristics.
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