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In the deep ocean, tsunami waves propagate with speed exceeding 800 km/h and wave height of a few centimeters or less. As tsunami reaches shallow waters of the coast, the waves slow down and the water can pile up to tens of metres or more in height.
Sep 29, 2024 · Tsunami, catastrophic ocean wave usually caused by a submarine earthquake, by a landslide, or by a volcanic eruption. In deep water it travels as fast as 800 km (500 miles) per hour, with enormous wavelengths of more than 500 km (310 miles) but small wave amplitudes of about 30 to 60 cm (1 to 2 feet).
As the tsunami approaches the coast and the waters become shallow, wave shoaling compresses the wave and its speed decreases below 80 kilometres per hour (50 mph). Its wavelength diminishes to less than 20 kilometres (12 mi) and its amplitude grows enormously—in accord with Green's law.
Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible. Tsunamis 101 | National ...
A tsunami is a long, high sea wave produced by a disturbance, such as a volcanic eruption, submarine earthquake or coastal landslide. Tsunamis can have heights of up to 30 m (98 ft) and reach speeds of 950 km (589 mi) per hour.
Learn what a tsunami is, how it is caused by earthquakes or volcanoes, and how it travels across the ocean. Find out why tsunamis are not tidal waves and how they can affect coastal areas.
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