Tsunami Warning Systems

A tsunami warning system is built up by two important infrastructures: a system of sensors to detect tsunamis at sea and a system to quickly communicate any warnings.

Japan has experienced many severe tsunami events and has a regional warning system. There are 4 international tsunami warning systems for the world oceans of

• the Pacific Ocean
• the Indian Ocean
• the North Eastern Atlantic, the Mediterranean and connected seas
• the Carribean

Source: http://techpartnerships.noaa.gov/News/TabId/306/ArtMID/1273/ArticleID/10096/Pacific-Tsunami-Warning-Center-and-Deep-ocean-Assessment-and-Reporting-of-Tsunamis-DART174-Buoys.aspx