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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.
1882 Mt. Galunggung, Indonesia. By, Emily Vasseur In the month of October of 1882, a casualty occurred. In Indonesia the volcano Mt. Galunggung erupted. This eruption caused 4,011 deaths and 114 destroyed villages. It was also categorized as a VEI=5 volcanic eruption. The VEI stands for Volcanic Explosivity Index and it records how much volcanic material is thrown out, how high the eruption goes, and how long it lasts.