Scientists analyse seismic waves from Japan’s 2011 earthquake that reached deep into the Earth and may have been linked to subtle postseismic ground movement of a few millimeters

A decade after Japan’s massive 2011 earthquake, scientists discovered seismic waves travelled to Earth’s core, bounced back, and triggered tiny crustal movements across the nation. This core-reflected wave, strong enough to coincide with fault slips, highlights a previously underestimated interaction between deep Earth energy and stressed fault networks, potentially impacting seismic hazard models.