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Tsunami are large waves caused by sudden movement of the ocean due to earthquakes, landslides, large volcanic eruptions or meteorite impact in the ocean.
Most tsunami are caused by large earthquakes on the seafloor when slabs of rock move past each other suddenly, causing the overlying water to move.

en.wikipedia.org/wiki/Tsunami

A tsunami or tidal wave, also known as a seismic sea wave, is a series of waves in a water body caused by the displacement of a large volume of water, ...

www.tsunami-alarm-system.com/en/phenomenon-tsunami/phenomenon-tsunami-formation.html

The term tsunami from the Japanese and means - Big wave in the port. ... In order for a tsunami caused by a seaquakes to occur, three things have to be happen:

www.windows2universe.org/?page=/earth/tsunami2.html

Apr 28, 2016 ... A tsunami is a series of waves generated in an ocean or other body of water by a disturbance such as an earthquake, landslide, volcanic ...

www.ask.com/youtube?q=How+Is+a+Tsunami+Created%3F&v=OQ3oXIjPmaE
Jan 20, 2015 ... What's the difference between a tsunami and a normal wave? What makes them so deadly? Learn more at HowStuffWorks.com: ...

sciencing.com/tsunami-created-8747310.html

Apr 24, 2017 ... Few natural phenomena can match the power of a tsunami. Tsunamis are ... The most common type is caused by earthquakes. In these types of ...

news.nationalgeographic.com/news/2007/04/070402-tsunami.html

Apr 2, 2007 ... In the wake of yesterday's Solomon Islands tsunami, National Geographic News explains how the killer waves are caused, what the warnings ...

www.thesun.co.uk/tech/1992625/tsunami-how-formed-worst-disasters

Jul 21, 2017 ... A tsunami, also called a seismic wave, is a series of waves in a water body caused by the movement of a large body of water.

itic.ioc-unesco.org/index.php?option=com_content&view=article&id=1158&Itemid=2026

By far, the most destructive tsunamis are generated from large, shallow ... disturb the ocean's surface, displace water, and generate destructive tsunami waves.

geology.com/articles/tsunami-geology.shtml

What Causes a Tsunami - by Geology.com. ... A tsunami is a large ocean wave that is caused by sudden motion on the ocean floor. This sudden motion could be  ...