USGS Frequently Asked Questions

Question: What is the difference between a tsunami and a tidal wave?

Answer:

Although both are sea waves, a tsunami and a tidal wave are two different unrelated phenomenona. A tidal wave is a shallow water wave caused by the gravitational interactions between the Sun, Moon, and Earth. A tsunami is a sea wave caused by an underwater earthquake or landslide (usually triggered by an earthquake) displacing the ocean water.

Source of this FAQ:
http://earthquake.usgs.gov/learning/

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