Please see the following web sites at:
NOAA Tsunami Website (http://www.tsunami.noaa.gov) 
NOAA Center for Tsunami Research (http://nctr.pmel.noaa.gov), such as:

    What is a tsunami? 
    http://www.tsunami.noaa.gov/tsunami_story.html

    NOAA's role in tsunami hazard assessment, warning, research and response
    http://www.tsunami.noaa.gov/noaa_what.html

Tsunami Safety:

http://itic.ioc-unesco.org/index.php?option=com_content&view=article&id=1711&Itemid=2000&lang=en

    Tsunami FAQ from the NOAA Center for Tsunami Research
    http://nctr.pmel.noaa.gov/faq.php

    Tsunami Event information from the NOAA Center for Tsunami Research
    http://nctr.pmel.noaa.gov/database_devel.html

    Tsunami animations and photos
    http://www.tsunami.noaa.gov/photos_animations.html

    About Tsunami research and modeling from the NOAA Center for Tsunami
    Research
    http://nctr.pmel.noaa.gov/model.html