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What is VEI ?

Volcanic Explosivity Index

Profile the intensity of a volcano eruption (VEI) to, measure, and calculate the force mountain, volcano refers to.

This method, similar to device measure earth quake, which unit is it on the Richter scale. The originator of this method, measuring the two geologist named Chris and Steve the predecessor of∗. The height of the smoke column and the volume of material, factors, major, arrange the table, sensing the explosion. Arrange the ranks in terms of increase of the logarithmic calculated, that is, the force , etc., ten times the air of the past. Divided into degrees from zero to eight, that is, zero represents the activity of commodity low-risk volcanoes are in the event that the number eight, etc. the eruption of massive and with influences of world view. Grade 9 also in this table is calculated but if the occurrence of such a volcanic, etc., in all probability, the destruction of the world inevitable.

during the the past only once the explosive to the severity of 8 VEI occurred, and in the top ten every summer, last a minimum of five volcanic explosion with Grade 7 VEI happened.
VEI