A tsunami is a series of water waves caused by the displacement of a large volume of a body of water, typically an ocean or a large lake. Tsunami waves do not resemble normal sea waves, because their wavelength is far longer.
A station attendant (C) explains the train service situation for the Tohoku Shinkansen (bullet train) which connects Tokyo and northern Japan at Tokyo Station on December 7, 2012 following a 7.3 earthquake and tsunami alert. A one metre-high tsunami hit northeast Japan after a powerful undersea quake struck off the coast which was devastated in last year's quake-tsunami disaster.
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