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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/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 ...

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 ...

sciencing.com/tsunami-created-8747310.html

Few natural phenomena can match the power of a tsunami. ... They can also be caused by volcanic eruptions, nuclear explosions and in very rare cases, ...

.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: ...

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  ...

academic.evergreen.edu/g/grossmaz/springle

Tsunamis, on the other hand, can be caused by a few different means: 1) the down ... There is an instance in 1958 where a tsunami was caused by rockfall in ...

www.voanews.com/a/167170.html

Mar 10, 2011 ... A tsunami is a series of large waves generated by an abrupt movement on the ocean floor that can result from an earthquake, an underwater ...