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A number from zero to eight rating an eruption's size.
Also known as: VEI, Eruption index
The volcanic explosivity index rates eruptions from zero to eight by the volume ejected and the height of the column. Like earthquake magnitude it is logarithmic, and no eruption in recorded history has reached eight.
Rates an eruption from zero to eight by ejected volume and eruption column height.
Contexts: Technical drawing, Maps
Is logarithmic, each step representing roughly a tenfold increase in erupted volume above index two.
Contexts: Technical drawing, Maps
Has no recorded eruption at its maximum value, the highest known events being rated at seven or eight from geological evidence rather than observation.
Contexts: Technical drawing, Maps
A numeral from zero to eight printed in an eruption record or on a comparative chart.