東日本大震災、日本が5ミリ動く　地球内部で地震波が反射　米チーム：朝日新聞

A Giant Seismic Wave Bounced Off Earth's Core And May Have Shifted Japan

When the magnitude 9.0 Tōhoku earthquake struck off the coast of Japan in 2011, its seismic shivers did more than ripple through the planet.