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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(or tidal wave) is a giant wave caused by a seaquake or eruption of sea volcanoes.After these disasters occur,water near the shore recedes as if there is a low tide.T â¦ hen,the water goes back as a wave at speeds of 800 miles per hour with a height reaching 30 meters.