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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.
It was the most powerful volcano recorded in modern times-a 7 on the volcanic explosivity index (VEI-7). The collapse of the eruption column produced numerous burning pyroclastic flows-high-density mixtures of burning rock fragments and hot gases-that descended downslope at great speed.