The overwhelming 98.9% market-implied odds against a magnitude 10.0 or greater earthquake before 2027 reflect the absence of any observed event at that scale in the instrumental record and the physical limits imposed by Earth's tectonic plates. The largest reliably measured quake reached 9.5 in Chile in 1960, and the logarithmic moment-magnitude scale means a 10.0 would release roughly 32 times more energy, requiring rupture lengths and fault slips far beyond documented subduction-zone segments. USGS and global seismic catalogs show no precursors or strain accumulation patterns consistent with such an event in the next 15 months. While model uncertainty exists and an unforeseen great subduction-zone rupture could theoretically occur, historical frequency and current monitoring data make that outcome statistically negligible.