A wave caused by a tsunami flows into the city of Miyako from the Heigawa estuary in Iwate Prefecture after a magnitude 8.9 earthquake struck Japan March 11, 2011. (Mainichi Shimbun /Reuters)

A wave caused by a tsunami flows into the city of Miyako from the Heigawa estuary in Iwate Prefecture after a magnitude 8.9 earthquake struck Japan March 11, 2011. (Mainichi Shimbun /Reuters)