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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

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 ...

.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: ...

www.voanews.com/a/what-causes-a-tsunami-117813908/167170.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 ...

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.australiangeographic.com.au/topics/science-environment/2011/03/tsunamis-how-they-form

Mar 18, 2011 ... But large events like the earthquake and tsunami in Chile in 2010 and the ... Once a tsunami has been generated, scientists can accurately ...