A magnitude 6.1 earthquake struck 17 km west of Río Grande, Panama, on October 12 at 23:20 UTC, according to USGS measurements, establishing it as the day's largest event and driving the 99.5% market-implied probability for a 6.1 or greater outcome. This shallow event occurred along the boundary between the Nazca and Panama plates, consistent with ongoing aftershock activity from earlier regional quakes. Smaller events, including a 5.5 in Tonga and a 5.4 along the Mid-Indian Ridge, registered well below this threshold. Market consensus reflects high confidence in final USGS-reviewed magnitudes, though a downward revision of the Panama event or identification of an unreported larger quake elsewhere could alter resolution.