Trader consensus on Polymarket prices a mere 9.5% implied probability for a magnitude 8.0+ megaquake worldwide by June 30, 2026, per USGS data, driven by the events' extreme rarity—averaging roughly one annually—and the absence of qualifying events since late 2025 despite moderate M7.4 quakes off Japan and Indonesia in April. Those triggered brief advisories from Japan's Meteorological Agency estimating ~1% short-term risk, which expired without escalation, and global seismicity remains unremarkable per USGS catalogs, showing no foreshock swarms, accelerated strain on GPS-monitored faults, or heightened activity in high-risk zones like the Nankai Trough or Cascadia subduction zone. Realistic challenges include an unforeseen megathrust rupture, though current observations indicate low near-term odds; daily USGS updates will refine monitoring through resolution.