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Volcanic Explosivity Index
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relative measure of explosive volcanic eruption size (based on product volume, eruption cloud height, etc.), open-ended with the biggest prehistoric eruptions given magnitude 8
~5 min read
Encyclopedic overview
VEI and ejecta volume correlation
The volcanic explosivity index (VEI) is a scale used to measure the size of explosive volcanic eruptions. It was devised by Christopher G. Newhall of the United States Geological Survey and Stephen Self in 1982.
Excerpted from Wikipedia’s “Volcanic Explosivity Index” article, available under the CC BY-SA 4.0 licence.