A tsunami is actually a type of tidal wave. A tidal wave is a variety of wave that moves around 200mph and can be as tall as 1,000ft. There are a three types of tidal waves, tidal bores, tidal surges, and tsunamis.
They are actually separate occurrences. Tidal waves can be predicted because they are produced by the daily tides, which are caused by the gravitational pull of the Moon and Sun. As the tide rolls in and out, it produces a rise and fall in sea level that stretches across thousands of miles. A tsunami, on the other hand, occurs when some event disturbs the ocean. An earthquake, for example, can jiggle or displace the ocean floor, perhaps triggering an underwater landslide. The water above such an event rises or falls, creating a surface wave that can travel at hundreds of miles an hour.
Tsunamis are not tidal waves; they are caused by displacement of water by landslides, earthquakes, and similar phenomena unrelated to tides.
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