Trader consensus on Polymarket heavily favors "No" at 90% implied probability for a magnitude 9.0+ megaquake worldwide by June 30, reflecting the extreme rarity of such events—only five have occurred globally since 1900, per USGS records—and the absence of detectable precursors like escalating seismic swarms or strain accumulation on major subduction zones. A magnitude 7.4 offshore Japan earthquake on April 20 prompted a brief 1% short-term risk advisory from the Japan Meteorological Agency for a regional M8+, but activity subsided without escalation, with global seismicity remaining low through early May per USGS monitoring. Key fault systems, including Japan's Nankai Trough (80% M9 chance over 30 years) and Cascadia subduction zone, show no imminent short-term triggers. Continuous USGS data updates could shift sentiment if unusual patterns emerge before resolution.