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A tsunami is a series of waves with a long wavelength and period (time between crests). Time between crests of the wave can vary from a few minutes to over an hour.

Tsunamis are often incorrectly called tidal waves; they have no relation to the daily ocean tides.

Tsunami (soo-NAH-mee) is a Japanese word meaning harbour wave.

Tsunamis can occur at any time of day or night.