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Because of the giant earthquake. The big earthquake that happened in Japan this year was near the coast. That means part of it was underwater.

Tsunamis can be generated when the sea floor suddenly deforms and affects the water over it. Tectonic earthquakes are a kind of earthquake that are associated with the earth's crust being messed up; when these earthquakes happen beneath the ocean, the water above the earthquake-y area is messed up. Waves are formed as the displaced water attempts to regain its former peacefulness. When large areas of the sea floor become earthquake-y, a tsunami can form.

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14y ago

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