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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 it? A tsunami, or seismic sea wave, is a series of destructive and very dangerous waves that result from earthquakes or other types of disturbances such as volcanic eruptions, meteorite impacts, and landslides. Its waves can get up to 30 m (100 ft) tall--or as high as a 10-story building.sunamis are extremely deadly and can't be predicted, so they are rarely caught on camera and you won't have much time to react when you spot the first wave coming in. They can wipe out an entire population of people and bring a city down to its knees.