The 88% market-implied probability of no megaquake by June 30 stems primarily from the statistical rarity of magnitude 8+ events combined with the brief remaining window. USGS seismic records show great earthquakes occur globally only a few times per decade on average, with recurrence intervals along major subduction zones and faults spanning decades to centuries. Current monitoring data reveal no anomalous foreshock swarms, accelerated slip, or other precursors that would elevate near-term risk. Traders weigh these baseline rates against ongoing USGS and international network observations, which continue to show typical background seismicity without signals of rapid escalation. New data releases from global networks over the coming weeks could refine assessments but are unlikely to alter the low odds absent an unprecedented cluster of activity.