Megatsunami

Megatsunami, also known as iminami[citation needed], is an informal term to describe a tsunami that has initial wave heights that are much larger than normal tsunamis. Unlike usual tsunamis, which originate from tectonic activity and the raising or lowering of the sea floor, known megatsunamis have originated from large scale landslides or impact events.

John McBrewster Agnes F. Vandome Frederic P. Miller 

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