Tsunami warnings issued for at least 20 countries after quake 11 Mar 2011 Authorities in at least 20 countries and numerous Pacific islands issued tsunami warnings Friday after an 8.9-magnitude earthquake struck Japan, the National Weather Service said. The wide-ranging list includes Russia and Indonesia, Central American countries like Guatemala, El Salvador and Costa Rica and the U.S. state of Hawaii. Tsunami warning sirens sounded in Hawaii around 10 p.m. Thursday (3 a.m. ET).