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A new NASA study is challenging a conventional theory about how tsunamis form.

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Tsunamis are usually created by the movement of the seafloor during earthquakes. 

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Using a large wave tank, researchers recreated these earthquakes 

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and found that horizontal seafloor displacement contributes to the formation and power of the wave.

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Previously, it was thought that only vertical displacement of the seafloor could trigger tsunamis.

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Better understanding how tsunamis develop can improve future forecasts and potentially save lives.