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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.
Volcanoes: How to Measure Volcanic Eruptions. See how to measure volcanic eruptions based on The Volcanic Explosivity Index (VEI). Volcanic eruptions vary in size and explosiveness.Volcanologists take a number of factors into account when they determine the âbignessâ of a volcanic eruption. As you can see from the chart below, small volcanoes occur more frequently and truly colossal volcanoes don't happen very often (whew).For a large eruption, it takes much time for gas pressures to build up.olcanologists take a number of factors into account when they determine the âbignessâ of a volcanic eruption. As you can see from the chart below, small volcanoes occur more frequently and truly colossal volcanoes don't happen very often (whew). For a large eruption, it takes much time for gas pressures to build up.