Japan's 2011 megaquake sent a seismic wave nearly 2,900 km to Earth's core, which returned 13 minutes later and shifted the entire country eastward
How a wave travelled nearly 2,900 km beneath Earth's surface Why the wave returned after 13 minutes Why this had never been observed before The
How a wave travelled nearly 2,900 km beneath Earth's surface Why the wave returned after 13 minutes Why this had never been observed before The GPS signal that puzzled scientists for 15 years How researchers ruled out other possibilities The discovery's implications for earthquake science What the finding reveals about Earth's hidden interior
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