Trader consensus on Polymarket prices a mere 9.5% implied probability for a megaquake—Magnitude 8.0 or greater anywhere worldwide by June 30—reflecting the rarity of such events amid subdued global seismic activity in 2026. The U.S. Geological Survey (USGS) reports no Magnitude 8.0+ quakes year-to-date, with the largest being a 7.5 near Tonga in March; recent advisories, like Japan's post-7.7 event megaquake alert for the Nankai Trough, expired April 28 without escalation, returning risk to baseline levels around 0.1% per week in high-hazard zones. Current monitoring shows no unusual foreshock swarms, strain signals, or activity spikes in key subduction zones such as Cascadia or Sumatra. While sudden ruptures in seismic gaps remain possible, new USGS operational earthquake forecasts due mid-May could refine short-term probabilities if patterns shift.