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A tsunami is a series of waves caused by the displacement of a large volume of water, usually by an earthquake. Learn about the origin, terminology, history and effects of tsunamis, and how they differ from tides and normal ocean waves.
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).
The web page shows the latest earthquake and tsunami information for the U.S. and the world. There is no tsunami warning, advisory, watch, or threat in effect as of 4/19/2025, 6:01:26 AM.
Learn how tsunamis are generated by earthquakes, landslides, volcanoes and weather, and how they affect coastlines around the world. Find out about tsunami history, monitoring, alert systems and mitigation.
Learn about the causes, characteristics and impacts of tsunamis, the ocean waves triggered by large earthquakes, volcanic eruptions or landslides. Find out how to recognize, prepare and respond to tsunami warnings and hazards.
The image is just one snapshot of the terrible disaster caused by the Indian Ocean Tsunami, which struck on Boxing Day 2004 and ended up becoming the deadliest natural disaster we've had thus far ...
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.
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.
Learn about tsunamis, their causes, effects, and safety tips from NOAA. Explore data, videos, activities, and stories related to tsunami science and history.
Learn how tsunamis are formed by underwater earthquakes, landslides, or volcanic eruptions, and how they can travel across oceans and cause devastating damage. Find out what the warning signs are and how to respond when a tsunami threatens.