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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.
Volcanic Explosivity Index (VEI ) The volcano explosivity index (VEI) is a scale used to measure the intensity of volcano eruptions. It is similar to the Richter and Mercalli scales, which measure the intensity of earthquakes. The VEI measures explosivity, volume of ash (tephra), and the height ash reaches into the atmosphere.