Traders assign a 93.5% probability against a megaquake (magnitude 9 or greater) by August 31 because these events remain statistically rare, with global recurrence intervals measured in decades rather than months. USGS seismic networks report no unusual foreshock activity, GPS-detected strain accumulation, or elevated moment release in major subduction zones as of early August 2026. Current monitoring shows background seismicity levels consistent with long-term averages, and no official alerts from agencies tracking tectonic stress. While an unforeseen rupture along a locked fault segment cannot be entirely ruled out, the lack of precursors and the short remaining window strongly underpin the market consensus.