TokyoJapan shifted 6 millimeters east when a shear wave from the 2011 Tohoku quake bounced off Earth’s core.
University of Chicago researchers found the returning wave triggered a plate-boundary slip spanning 3,000km, 13 minutes after rupture.
Core-reflected waves are a previously unrecognized hazard capable of reactivating a mainshock zone.
Sources: 404 Media