Tsunami's are usually caused by undersea earthquakes. Most of the time it takes an earthquake with a magnitude of more than a 7.5 on the Richter scale to cause a tsunami. To see an animation click here.
Another cause for a tsunami could be a volcanic eruption or an undersea landslide but these rarely cause tsunami's. One of the most rare causes of a tsunami could be a meteor or asteroid hitting the earth in the middle of the ocean.
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