Of or relating to a volcano. Characterized by volcanoes.
Fr.: éruption volcanique
The explosive ejection of superheated matter from a → volcano.
volcanic explosivity index (VEI)
dišan-e oskaftandegi-ye âtašfešâni
Fr.: indice d'explosivité volcanique
A logarithmic scale, ranging from 1 to 8, used to measure the intensity of volcano eruptions. The VEI is based on several factors: the degree of fragmentation of the volcanic products released by the eruption, the amounts of sulfur-rich gases that form stratospheric aerosols, the volume of the eruptions, their duration, and the height is reached. The largest eruptions (8) produce an amount of bulk volume of ejected → tephra of ~ 1,000 km3.
dudkaš-e âtašfešâni (#)
Fr.: cheminée volcanique