Trader consensus on Polymarket prices a 77.5% implied probability for no magnitude 8.0+ earthquake by June 30, driven by the absence of foreshocks, strain accumulation signals, or anomalous seismic swarms in high-risk zones like Japan's Nankai Trough or the Cascadia subduction zone, per USGS monitoring. The largest event of 2026 so far—a M7.5 offshore Tonga on March 24—did not escalate, underscoring the rarity of megaquakes, which occur globally about once per year on average. Recent moderate activity, including a M7.4 Flores Sea quake on April 1, has not altered short-term odds, as earthquake forecasting remains inherently uncertain without precise precursors. Watch USGS significant earthquake lists for updates through spring.