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Tsunamis (pronounced soo-ná-mees), also known as seismic sea waves (mistakenly called "tidal waves"), are a series ... volcanic eruption or meteorite. A tsunami can move hundreds of miles per ...

Shock waves triggered by ... changes in tidal levels. The tidal changes occurred three to four hours earlier than the expected arrival time of a typical tsunami generated by an offshore earthquake.

A magnitude 7.1 earthquake has been recorded in Tonga, and a tsunami warning has been issued for places within 300km of the ...