Tsunamis are tidal waves that are often caused by an undersea earthquake.Usually, there is some warning of a tsunami because scientists can detect the seismic waves caused by the earthquake. The tsunami rushes along at up to 970 km/h, building into a wall of water up to 30 meters high as it approaches land. Tsunamis are most common in earthquake zones, particularly around Japan.
Another form of tsunami is called storm surge, in which giant wave are whipped up by a storm. In 1970, a storm surge and cyclone hit Bangladesh, killing 266,000 people. It returned again in 1985, killing another 10,000 people.
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