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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 ...

cwarn.org/tsunami/how-tsunami-occur

Tsunami are actually waves caused by sudden movement of the ocean due to ... Landslides happen when slopes become too steep to withstand gravity.

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.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 ...

ptwc.weather.gov/faq.php

? Major tsunamis occur about once per decade. Based on historical data, about 59% ...

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:.

oceantoday.noaa.gov/tsunamiawareness

A tsunami is a series of ocean waves caused by any large and sudden ... When that happens, there's a transfer of energy from the seafloor to the ocean, ... in a location of a tsunami strike, here's what you need to do to stay safe: keep calm; ...