Tsunami

A surge of water with a long wavelength produced by the displacement of a body of water. Causes of tsunami include an earthquake causing offset (uplift or subsidence) of the sea bed, a volcanic eruption, or a large landslide (including sector collapse). The height of a tsunami is influenced by the morphology of the coastline that it travels towards. The speed of a tsunami ranges between 10-100 km/h in shallow areas, and up to 800 km/h when crossing deeper waters. Landslides or icefalls into lakes or fiords may also generate tsunami.