The strong market-implied odds favoring no megaquake (magnitude 8.0 or greater) by June 30 stem primarily from the global baseline rate of roughly one such event per year, per USGS historical records, yielding low probability over a narrow 15-day window absent specific precursors. No recent seismic swarms, foreshock sequences, or model consensus from monitoring agencies indicate elevated short-term risk, despite localized advisories after April's Japan Trench activity that have since subsided. Trader conviction aligns with the absence of verifiable triggers like sudden stress transfer or unusual strain measurements. A realistic but low-probability shift could occur only if an unforeseen aftershock cascade or new subduction zone rupture materializes, though current observational data show no such trajectory.