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Learn what tsunamis are, how they are formed by underwater earthquakes or other events, and how they can cause devastation on land. Find out how to recognize the signs of a tsunami and how to stay safe with early warning systems.
- 3 min
2 avr. 2007 · A tsunami is a series of great sea waves caused by an underwater earthquake, landslide, or volcanic eruption. More rarely, a tsunami can be generated by a giant meteor impact with the...
18 juin 2024 · Learn about tsunamis, catastrophic ocean waves caused by earthquakes, landslides, or volcanoes. Find out how they form, propagate, and affect coastlines, and see examples of notable tsunamis in history.
- The Editors of Encyclopaedia Britannica
- A tsunami is a catastrophic ocean wave, usually caused by a submarine earthquake, an underwater or coastal landslide, or a volcanic eruption. Waves...
- Perhaps the most destructive tsunami in recorded history was the Indian Ocean Tsunami of 2004. A 9.1-magnitude earthquake occurred off the coast of...
- Because of frequent tsunamis in the Pacific Basin, many adjacent countries have established tsunami warning systems that look for large earthquakes...
- During a tsunami, experts recommend that people attempt to find higher ground that is as far inland as possible in order to avoid the deadly waves.
- Tsunamis are not limited to bodies of water on Earth. A 2016 analysis of the Martian surface revealed evidence of two separate tsunami events that...
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.
Learn how tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea. Find out how they travel, how they affect different ocean depths, and why they are not tidal waves.
Un tsunami (en japonais 津波, litt. « vague du port ») est une série d' ondes de très grande période se propageant à travers un milieu aquatique ( océan, mer ou lac 1 ), issues du brusque mouvement d'un grand volume d'eau, provoqué généralement par un séisme, un glissement de terrain sous-marin ou une explosion volcanique, et pouvant se transforme...
1 oct. 2018 · Learn what tsunamis are, how they are caused, how they move, and how to stay safe from them. Find out about NOAA's role in tsunami warning, forecasting, and research.
