A pyroclastic flow (also known as a pyroclastic density current) is a common and devastating result of some
volcanic eruptions. The flows are fast-moving currents of hot gas,
ash, and rock (collectively known as
tephra), which can travel away from the volcano at up to 700 km/h. The gas can reach temperatures of up to 1000 degrees Celsius. The flows normally hug the ground and travel downhill, or spread laterally under gravity. Their speed depends upon the density of the current, the rate volcanic output, and the gradient of the slope.
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A rapid, extremely hot, downward stream of pyroclastics, air, gases, and ash ejected from an erupting volcano. A pyroclastic flow may be as hot as 8000C or more and may move at speeds higher than 150 kilometers per hour.
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