**No outcome at 98.9% reflects the strong scientific consensus that magnitude 10.0 or greater earthquakes cannot occur on Earth.** USGS analysis shows that a magnitude-10 event would require a fault roughly 14,000 km long with substantial average slip—far exceeding any known tectonic structure, which would need to span much of the planet’s circumference. The largest recorded earthquake remains the 9.5 Valdivia event in Chile in 1960 on a ~1,000 km subduction-zone rupture; all subsequent instrumental maxima have stayed at or below 9.5. Global seismic networks, including continuous USGS monitoring, show no activity approaching this threshold, and subduction-zone models place realistic upper limits near 9.6 under optimal conditions. With only months remaining before 2027, the probability of an unforeseen rupture of unprecedented scale is negligible. The sole theoretical scenarios—such as an unrecognized mega-fault or simultaneous multi-zone failure—lack any supporting geological evidence and would contradict established plate-tectonic mechanics.