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NWS/West Coast and Alaska Tsunami Warning Center Frequently Asked Questions Last updated: 11/2010 What is a tsunami?

April 26, 2017Alaska center Coast last updated NWS tsunami warning West

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NWS/West Coast and Alaska Tsunami Warning Center Frequently Asked Questions Last updated: 11/2010 What is a tsunami?

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• A tsunami is a series of waves with a long wavelength and period (time between crests) generated by a large, impulsive displacement of sea water. • Time between crests of the wave can vary from a few minutes to over an hour, but generally are in the range of 15 to 25 minutes. • Tsunamis are often incorrectly called tidal waves; they have no relation to the daily ocean tides.