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Large tsunamis have occurred in the United States and will undoubtedly occur again. Significant earthquakes around the Pacific rim have generated tsunamis that struck Hawaii, Alaska, and the U.S. west coast.
A sign in Alaska warning of the danger of tsunamis. Tsunamis, also known as seismic waves, are massive bursts of waves that result from sudden motions along the ocean flor. Tsunamis are different from regular waves in that they have a much greater wavelength. Tsunamis go back as far as the earth’s history.