A megatsunami is a very large wave created by a large, sudden displacement of material into a body of water. Megatsunamis have quite different features from other, more usual types of tsunamis. They can have extremely high initial wave heights of hundreds and possibly thousands of metres, far beyond any ordinary tsunami. Ordinary tsunamis have shallow waves out at sea, and the water piles up to a wave height of up to about 10 metres (33 feet) as the sea floor becomes shallow near land. By contrast, megatsunamis are caused by giant landslides and other impact events. This could also refer to a meteorite hitting an ocean. Underwater earthquakes or volcanic eruptions do not normally generate such large tsunamis, but landslides next to bodies of water resulting from earthquakes can, since they cause a large amount of displacement.
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