volcanic explosivity index (VEI)

Jun 30th, 2015
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`The volcanic explosivity index (VEI) was devised by Chris Newhall of the US Geological Survey and Stephen Self at theUniversity of Hawaii in 1982 to provide a relative measure of the explosiveness of volcanic eruptions.Volume of products, eruption cloud height, and qualitative observations (using terms ranging from "gentle" to "mega-colossal")

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`Thevolcanic explosivity index(VEI) was devised byChris Newhallof theUS Geological SurveyandStephen Selfat theUniversity of Hawaiiin 1982 to provide a relative measure of the explosiveness ofvolcaniceruptions.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. A value of 0 is given for non-explosive eruptions, defined as less than 10,000m3(350,000cuft) oftephraejected; and 8 representing a mega-colossal explosive eruption that can eject 1.01012m3(3.51013cuft) of tephra and have a cloud column height of over 50km (31mi). The scale is logarithmic, with each interval on the scale representing a tenfold increase in observed ejecta criteria, with the exception of between VEI 0, VEI 1 and VEI 2.[1]With indices running from 0 to 8, the VEI associated with an eruption is dependent on how much volcanic material is thrown out, to what height, and how long the eruption lasts. The scale is logarithmic from VEI 2 and up; an increase of 1 index indicates an eruption that is 10 times as powerful. As such there is a discontinuity in the definition of the VEI between indices 1 and 2. The lower border of the volume of ejecta jumps by a factor of 100 from 10,000 to 1,000,000m3(350,000 to 35,310,000cuft) while the factor is 10 between a

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