A seismic wave from Japan’s 2011 magnitude-9 earthquake travelled nearly 2,900 kilometres down to Earth’s core, bounced back to the surface 13 minutes later, an... (opens in new tab)

For 15 years after the 2011 Tohoku-Oki earthquake — among the most thoroughly instrumented natural disasters in history — a small anomaly in the GPS data sat unresolved in the archives. Approximately 15 minutes after the magnitude-9 main shock struck off the coast of northeastern Honshu, GPS stations distributed across the entirety of Japan registered […]