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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 happen most frequently in the Pacific Ocean because of the many large earthquakes associated with subduction zones along the margins of the ...

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?

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  ...

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.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 ...

academic.evergreen.edu/g/grossmaz/springle

Tsunamis are not always colossal waves when they come into the shore. In fact, " ... most tsunamis do not result in giant breaking waves (like normal surf waves ...

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:.