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The primary eruption characteristic used to determine the volcanic explosivity index is the volume of pyroclastic material ejected by the volcano. Pyroclastic material includes volcanic ash, tephra, pyroclastic flows, and other types of ejecta.
An explosive eruption includes Aa lava, the volcano has a thick cap which traps all the gasses, this builds pressure. The lava is high in Silica and has lots of water vapor.A â¦ non explosive volcano includes, Pahoehoe lava, has a thin cap which lets pressure go easier, and is low in Silica and water vapor.mount of dissolved gasses in a liquid, the silica content, and the viscosity of the magma. Edit. Share to: 1  The Geological Significance and History of Tuff Rock Tuff is an igneous rock made from volcanoes. 2  When volcanoes erupt, they produce ash and debris that turns into solid matter upon cooling and aging.