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Lahar is an outflow of mud, rock and other pyroclastic material from a volcano which mixes with water as it proceeds down a river valley . Essentially it is a mudflow or landslide resulting from volcanic action, usually very fast moving and destructive. In some cases it can be more destructive than the actual volcanic eruption.

Lahars look and behave like flowing debris, and concrete, (also ash) and their impact destroys most man made structures. Mt Rainer had lahars that traveled at 70/80 km/h at depths of 30 meters or more.

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