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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.
Frequent readers of this column have learned that the explosivity of a volcanic eruption depends primarily on the type of lava being erupted. Hot, fluid lava (basalt), like that typical of HawaiÊ»i, allows the easy release of volcanic gases, and hence, is not usually explosive.