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The primary eruption characteristic used to determine the volcanic explosivity index is the volume of pyroclastic material ejected by the volcano. Pyroclastic material includes volcanic ash, tephra, pyroclastic flows, and other types of ejecta.
the restless earth 1 supervolcanoes A supervolcano is a volcano that erupts with a massive volume of material, much more than from a normal volcano â at least 1000km 3 of magma. To give you some idea of the great volume, the big eruption of Mount St Helens in the USA in 1980 produced 1km 3.he restless earth 1 supervolcanoes A supervolcano is a volcano that erupts with a massive volume of material, much more than from a normal volcano â at least 1000km 3 of magma. To give you some idea of the great volume, the big eruption of Mount St Helens in the USA in 1980 produced 1km 3.