**Seismic monitoring from USGS and VolcanoDiscovery shows M5.5+ activity running near or slightly below long-term averages during the September 14–20 window, with only a handful of events reaching or exceeding the threshold amid typical plate-boundary clustering in the Pacific Ring of Fire.** A notable 6.5 quake struck the Fox Islands region of Alaska on September 17 at intermediate depth, followed by a 6.4 event near Papua New Guinea on September 20, yet overall daily counts of confirmed 5.5+ shocks have remained modest, supporting the market’s heavy weighting toward ≤6 (50% implied probability). The 11-outcome at 29% reflects residual uncertainty around aftershock sequences or unreported offshore detections, while higher bins price in low odds given the absence of major shallow crustal swarms or subduction-zone bursts. Historical weekly baselines hover around 3–6 such events globally, with model consensus indicating no anomalous uptick through the period’s close. Traders are thus anchoring on observed catalog completeness rather than forecasts, as final USGS verification will resolve the market.