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Volume of products, eruption cloud height, and qualitative observations (using terms ranging from "gentle" to "mega-colossal") are used to determine the explosivity value. [The scale] is open-ended with the largest [volcanoes] in history given [magnitude] 8. TheVolcanic Explosivity Index (VEI) was devised byChris Newhall of theUS Geological Survey and Stephen Self at theUniversity of Hawaii in 1982 to provide a relative measure of the explosiveness ofvolcanic eruptions.
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