Megatsunami - Artist's view - While a tsunami is affected by the movements of the...

Megatsunami - Artist's view - While a tsunami is affected by the movements of the earth's crust, a megatsunami can be caused by a colossal collapse or the fall of an asteroid, causing powerful waves up to hundreds of metres in height. Megatsunami 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 a large scale landslide, collision, or volcanic eruption event