Jisho

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Noun
1. giant tsunami (over 3m in height according to the JMA definition); giant tidal wave
Wikipedia definition
2. MegatsunamiMegatsunami (also known as iminami) 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.
Read “Megatsunami” on English Wikipedia
Read “大津波” on Japanese Wikipedia
Read “Megatsunami” on DBpedia

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