NOAA Tsunami
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Featuring categories such as Basics, Big Picture, Warning, Preparedness, and more, this site offers both basic and in-depth coverage of the earthquakes that create tsunamis, their warning systems, as well as providing preparation and hazard assessment information.  The Education section provides resources for teachers and elementary students.  The National Oceanic and Atmospheric Administration (NOAA) is the government agency with primary responsibility for providing tsunami warnings to the United States.

Resource URL: http://www.tsunami.noaa.gov/