The most common underwater causes of tsunami are earthquakes and volcanoes. The event causes a large column of water to be displaced and moved out from the source. See the related question about the causes of tsunami for more detail about this question and about other causes of tsunami that may not start underwater.
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A tsunami is typically caused by underwater earthquakes, volcanic eruptions, or landslides that displace a large volume of water. This displacement creates a series of powerful waves that travel rapidly across the ocean, eventually reaching shorelines and causing widespread destruction.
Earthquake
Earthquake
A tsunami happens when a fault or underwater earthquake happens. Hope you found this info useful.
when there is a earthquake or landslide underwater
Yes, an underwater volcano has the potential to cause a tsunami if it erupts violently and displaces a large amount of water. The sudden release of gas, magma, and rocks into the ocean can generate a tsunami that can travel long distances.