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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.
California Volcano Observatory. During Holocene time Mount Shasta erupted pumiceous dacite tephra twice about 10,000 years ago. One deposit is more than 0.1 km 3 (0.024 mi 3) in volume and the other is less than 0.1 km 3; both lie mainly east and within about 50 km (31 mi) of the volcano.alifornia Volcano Observatory. During Holocene time Mount Shasta erupted pumiceous dacite tephra twice about 10,000 years ago. One deposit is more than 0.1 km 3 (0.024 mi 3) in volume and the other is less than 0.1 km 3; both lie mainly east and within about 50 km (31 mi) of the volcano.