A Giant Seismic Wave Hit Earth’s Core — and May Have Shifted Japan

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Scientists found a delayed reflected seismic wave that gently moved Japan and revealed a possible hidden earthquake hazard.

The Story Began With the 2011 Tōhoku Earthquake

One Wave Travelled Toward Earth’s Core

The Round Trip Covered 5,800 Kilometres

Japan’s GPS Network Detected Something Strange

No Known Aftershock Explained It

Other Explanations Did Not Fit

The Wave May Have Reactivated Two Plate Boundaries

The Hidden Event Was Enormous but Gentle

This May Be the First Event of Its Kind

It Reveals a Delayed Earthquake Hazard

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Fifteen years after Japan’s devastating Tōhoku earthquake, scientists have identified a second event hidden inside the seismic records. A wave from the magnitude-9.0 earthquake travelled deep into Earth, reflected from the boundary of the liquid outer core, and returned to Japan roughly 15 minutes later.

The returning wave appears to have triggered subtle movement across multiple tectonic boundaries, shifting much of Japan eastward by up to six millimetres. The movement was too small and gradual to feel, but it may represent a previously unrecognised earthquake hazard.

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