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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.
Volcanologists are scientists who use a variety of sophisticated equipment to measure and analyse volcanic activity, lava, rock, ashes and gases as well as earthquakes caused by eruptions. They also measure the magnitude and intensity of explosions, placing them on a scale from 1 to 8 (volcanic explosivity index).