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When do tsunamis occur?

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Most tsunamis–about 80 percent–happen within the Pacific Ocean's “Ring of Fire,” a geologically active area where tectonic shifts make volcanoes and earthquakes common. picture of town being wiped ... in energy and height. The tops of the waves move faster than their bottoms do, which causes them to rise precipitously. read more

Tsunamis happen when earthquakes, landslides or volcanic eruptions disturb the ocean floor. Most tsunamis occur when there are earthquakes at tectonic plate boundaries. When the ocean floor at the boundary rises or falls, it moves the water above and creates the huge waves that become tsunamis. read more

Tsunamis occur after an earthquake. The earthquake can occur under a city (ex. The New Madrid Missouri fault line; or the Los Angeles area's fault lines), but many occur on the ocean or sea floor. read more

A tsunami’s trough, the low point beneath the wave’s crest, often reaches shore first. When it does, it produces a vacuum effect that sucks coastal water seaward and exposes harbor and sea floors. read more

A tsunami is an incredibly large wave that is caused by underwater volcanic activity or by earthquakes that occur along fault zones underwater. These can cause water levels to rise rapidly and can be incredibly deadly. Tsunamis also do a vast amount of lasting damage to the property and economies of a region. read more

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