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The US based FEMA about Tsunamies. Tsunamis also known as seismic sea waves, are a series of enormous waves created by an underwater disturbance such as an earthquake, landslide, volcanic eruption, or meteorite. www.fema.gov
 
Wikipedia about Tsunami. A tsunami is a series of waves created when a body of water, such as an ocean is rapidly displaced on a massive scale. wikipedia.org
 

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