![]() Stromboli (since Roman times), Nyiragongo (2002), Raoul Island (2006) In the following table, the frequency of each VEI indicates the approximate frequency of new eruptions of that VEI or higher. The lower border of the volume of ejecta jumps by a factor of one hundred, from 10,000 to 1,000,000 m 3 (350,000 to 35,310,000 cu ft), while the factor is ten between all higher indices. ![]() As such, there is a discontinuity in the definition of the VEI between indices 1 and 2. ![]() The scale is logarithmic from VEI-2 and up an increase of 1 index indicates an eruption that is 10 times as powerful. 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.
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