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 pyroclastic flows, also called nuées ardentes (French for glowing avalanches), are highly mobile avalanches of high-temperature volcanic debris (lava blocks and volcanic ash, i.e pyroclasts) superheated volcanic gases and air that moves rapidly down the slopes of a volcano or can be channeled in the valleys. Mode of action: By shock wave, combustion, impact of projectiles, wrenching, abrasion, transport, burial Distance: (average) < 10 km
Temperature : < 900 °C
Speed: (average) 20-30 m/s
Blast, fires, total destruction of human infrastructures and vegetation, topographic changes by filling and disturbance of the hydrographic network.
On humans: death or serious injuries
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Volcanic Risks 