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volcanic explosivity index


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  • A measure of the severity of a volcanic eruption. The VEI scale ranges from 0 to 8; an index value of v corresponds to an output of at least 103+v cubic meters of magma. The Mt. St. Helens eruption of 1980 was a 5 on the VEI scale. The largest eruption in historic times, the Tambora eruption of 1815, was a 7.

    November 7, 2007