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Tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea. Out in the depths of the ocean, tsunami waves do not dramatically increase in height. But as the waves travel inland, they build up to higher and higher heights as the depth of the ocean decreases.
What is a tsunami? Causes; Size; Detection and warning; Prediction; What is a tsunami? Tsunamis are large and destructive waves caused by earthquakes, landslides, or volcanic eruptions. When a large wave is caused by the resonance of wave energy it is called a 'seiche'. Although they are created differently, both seiches and tsunamis can be large and destructive. Tsunamis from large earthquakes travel across entire oceans and can be 30â150 feet tall when they reach shore.