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A tsunami is formed when huge amounts of energy is released in shock waves. They travel outward in ripple-like movements called seismic waves. These movements of the seabed create huge waves which can pass through open seas at speeds of up to 400-500 miles per hour. In deep waters, tsunamis are low and wide, often less than three feet high and with as much as 95 miles between the crest of one wave and the next. However, when they reach shallower waters, they get more deadly as they can reach up to heights of 100 feet or more and crash inland. Back (Formation of a tsunami) | Next (When a Tsunami strikes) |