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Lahar is an Indonesian term for volcanic mudflow.  lahars contain a high concentration of rock debris to give them the strength necessary to transport huge boulders as well as buildings and bridges. They are highly destructive. Mode of action: abrasion, erosion, impact of carted materials, wrenching, transport, burial, filling, pressure Distance: (average) ~ 10 km
Température : 0 à < 100 °C
Vitesse : (average) 3-10 m/s
Strong damage of human infrastructures and vegetation, rupture of networks (in particular destruction of the bridges), topographic modifications of the valleys by filling or erosion.
On humans: death or serious injuries
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Volcanic Risks 