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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 .... Without an earthquake I do not see how such an accident could happen." The Roman historian Ammianus Marcellinus (Res Gestae 26.10.15–19)  ...

cwarn.org/tsunami/how-tsunami-occur

japan tsunami event details. ... How do tsunamis occur? Tsunami are actually waves caused by sudden movement of the ocean due to earthquakes, landslides  ...

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 ... More than 80% of the world's tsunamis occur in the Pacific along its Ring of Fire ...

academic.evergreen.edu/g/grossmaz/springle

How a Tsunami. Happens Lindsey Springer springle@uwec.edu ... In fact, "... most tsunamis do not result in giant breaking waves (like normal surf waves at the ...

tsunami.org/7science/04_what_causes_a_tsunami.html

Tsunamis are caused by violent seafloor movement associated with ... Tsunamis happen most frequently in the Pacific Ocean because of the many large ...

www.ga.gov.au/scientific-topics/hazards/tsunami/basics/causes

Where do Tsunamis occur? ... Tsunami are waves caused by sudden movement of the ocean due to earthquakes, landslides on ... These occur in several ways:.

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

Most tsunamis–about 80 percent–happen within the Pacific Ocean's “Ring of ... The tops of the waves move faster than their bottoms do, which causes them to ...

www.quora.com/Why-do-tsunamis-happen-in-the-Pacific-Ocean

Tsunamis are, pretty much and in simple terms, a shockwave that happens when the seafloor suddenly rises or falls, or when the water is disturbed in a major ...

www.dosomething.org/us/facts/11-facts-about-tsunamis

After you learn something, do something! Find out how to take ... About 80% of tsunamis happen within the Pacific Ocean's “Ring of Fire.” The first wave of a ...