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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.
A tsunami is a wave, or series of waves, caused by the vertical displacement of a column of water. This can be generated by earthquakes below the sea floor and violent volcanic eruptions above it, landslides above or below water or meteorite impacts into the sea.pecies Invasion. Tsunamis can carry massive amounts of debris from one side of the ocean to another. A concrete block from Misawa, Japan took 15 months to cross the Pacific Ocean and crash into the Oregon coast. Algae and other organisms attached to this debris survived the ocean crossing.