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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.
On this anniversary, we countdown the largest volcanic eruptions in history as measured by the Volcanic Explosivity Index (VEI) a classification system somewhat akin to the magnitude scale for earthquakes.hile the island that once hosted Krakatoa was completely destroyed in the eruption, new eruptions beginning in December 1927 built the Anak Krakatau (Child of Krakatau) cone in the center of the caldera produced by the 1883 eruption.