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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, ...

itic.ioc-unesco.org/index.php?option=com_content&view=article&id=1017:what-are-tsunamis-and-what-causes-them&catid=1004&Itemid=1004

From the area where the tsunami originates, waves travel outward in all directions. Once the wave approaches the shore, it builds in height. The topography of ...

oceanservice.noaa.gov/facts/tsunami.html

Tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea. They speed along as fast as jet planes. As they near land, these waves ...

www.lincolncity.org/index.asp?SEC=60CBC6B6-CFD1-4396-99A9-12D7D9985602&DE=3CBB9D7F-722A-46E6-A17A-D2C1638084CE&Type=B_BASIC

Tsunamis are ocean waves produced by earthquakes or underwater landslides. The word is Japanese and means “harbor wave,” because of the devastating ...

www.nationalgeographic.com/environment/natural-disasters/tsunamis

A tsunami is a series of ocean waves that sends surges of water, sometimes reaching heights of over 100 feet (30.5 meters), onto land. These walls of water can ...

www.cbc.ca/news/world/what-are-tsunamis-1.820058

Sep 29, 2009 ... A tsunami is a series of very long ocean waves created when a large body of water is displaced. A tsunami can hit shore with devastating ...

www.dkfindout.com/uk/earth/earthquakes/tsunami

Find out more about what causes tsunamis. Get information about tsunamis and discover interesting facts with DK Find Out, to help kids learn.

www.ducksters.com/science/earth_science/tsunamis.php

Kids learn about tsunamis including what causes them such as earthquakes, where they occur, why they are dangerous, and what happens during a tsunami ...

www.windows2universe.org/earth/tsunami1.html

Apr 28, 2016 ... A tsunami (pronounced tsoo-NAH-mee) is a series of waves, made in an ocean or other body of water by an earthquake, landslide, volcanic ...