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This resource provides information about variances in size and explosiveness of volcanoes that have erupted during the past 10,000 years. Included is a table showing that small eruptions are more frequent than larger ones. A feature of this site is the introduction of a scheme for estimating the magnitude of historic eruptions, called the Volcanic Explosivity Index (VEI). Historical eruptions can be assigned a VEI number on a scale of 0 to 8, using one or more of the criteria which include volume of ejecta, height of the eruptive column, qualitative descriptions, style of past activity, and height of spreading of the eruptive plume head. A chart shows an example for each VEI from 0 through 8 along with the plume height, volume, and eruption type classification. Each volcano name provides a link to detailed information about it.
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