Megatsunami

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.

Read more about Megatsunami:  Concept, History of The Hypothesis, Potential Future Megatsunami