Trader consensus on Polymarket prices "No" at 84.5% for a megaquake—defined as a USGS-recorded magnitude 8.0 or higher earthquake worldwide by June 30—driven by the absence of any qualifying events since market creation in late December 2025, despite a M7.4 subduction zone quake off northern Japan on April 20 that fell short and prompted only a minor uptick in long-term Nankai Trough alerts. USGS monitoring of major fault lines, including Cascadia and the Pacific Ring of Fire, shows no unusual seismic swarms or strain accumulation signaling an imminent great earthquake, aligning with historical rates of roughly one M8+ event per year globally but high unpredictability over short windows like the remaining seven weeks. Continuous real-time data from the USGS Earthquake Hazards Program remains the key watchpoint for any shifts.