Fifteen years after the magnitude 9.0 Tohoku-Oki earthquake tore through Japan's northeastern coast, scientists say they have uncovered a hidden seismic event buried in the disaster's immediate aftermath, one that exposes a hazard nobody had previously identified.
According to a new study published in the journal Science, the whole of Japan shifted around five or six millimetres eastward in the minutes after the quake, nudged not by a conventional aftershock at the surface, but by an enormous wave that had travelled to Earth's core and back.
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