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Tsunamis are large, rapidly moving ocean waves triggered by an abrupt movement of large volumes of water. The impact of a  pyroclastic flow, a lahar or a debris avalanche in the sea can generate tsunamis. Mode of action: immersion, impact of projectiles, erosion, wrenching, transport Distance: (averae) < 10 km - (max) > 500-600 km
Speed: (average) 2-3 m/s
Height of the waves: (average) 4-10 m - (max) > 50 m
Strong damage of human infrastructures and littoral vegetation Topographic disturbances Pollution of the fresh water reserves by salinisation
On humans: death or serious injuries
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Volcanic Risks 