In the U.S., tsunami early warnings are issued by two warning centers operated by the National Weather Service. The National Tsunami Warning Center (NTWC) monitors for earthquakes and issues tsunami advisories, watches, warnings, and information statements for Alaska, the U.S. mainland, U.S. Atlantic and Gulf of Mexico, Canada, and U.S. interests in the Caribbean (Puerto Rico and the U.S. Virgin Islands)[1,2,3].