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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)  ...

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 ...

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 ...

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  ...

soundwaves.usgs.gov/2005/01/fieldwork2.html

A tsunami is a set of powerful ocean waves most commonly caused by a large earthquake or landslide that occurs near or under the ocean. Scientists do not use ...

www.srh.noaa.gov/jetstream/tsunami/tsunami_faq.html

How often do tsunamis occur? Do all large undersea earthquakes generate tsunamis? How big is a tsunami? How long do tsunamis last when they happen?

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.tsunami.gov/?page=tsunamiFAQ

1.5 How often do tsunamis happen? According to the ... 1.7 Where can tsunamis happen in the United States ? ... 2.2 How do earthquakes generate tsunamis?

www.earthobservatory.sg/faq-on-earth-sciences/where-tsunami-most-likely-happen

Every coastal area and river estuary is potentially threatened by tsunamis, but they are most likely to happen on shores facing directly a megathrust. Scientists ...