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How do Kelvin waves differ from other water waves?

Unlike smaller, shorter water waves, Kelvin waves can be thousands of miles long, do not break, and maintain their shape as they move slowly along the coast. Whereas the periods of other water waves—that is, the time it takes for the wave to complete one cycle—are measured in seconds (wind waves), minutes (tsunamis), or hours (waves associated with tides), the periods of Kelvin waves may last several weeks.