Pyroclastic flow definition
Pyroclastic flow means hot clouds of ash, gas, and volcanic rock that flows rapidly down slope under gravity. These may flow at velocities up to 150 kilometers per hour. It is a synonym of ash flow, and may be projected from a laterally directed blast.
Pyroclastic flow means hot clouds of ash, gas, and volcanic rock that flows rapidly
Pyroclastic flow means the geologic process and products of hot clouds of ash, volcanic rock, and gas that flow rapidly downslope under gravity. [Ord. 1170B, 2000; Ord. 1157, 1998; Ord. 1150 §2, 1996]