What will the biggest earthquake be on October 20, 2026?
This market will resolve to the bracket containing the magnitude of the largest earthquake recorded globally on October 20, 2026, as reported by the USGS Earthquake Catalog.
Brackets: Under 5.3 / 5.3 to 5.4 / 5.5 to 5.6 / 5.7 to 5.8 / 5.9 to 6.0 / 6.1 or more. Exactly one bracket resolves "Yes".
The observation period is the UTC calendar day: 00:00 UTC to 23:59 UTC on October 20, 2026. An earthquake is assigned to the day containing its origin time.
Magnitude refers to the USGS preferred magnitude value, listed under 'Magnitude' in the format column.
If USGS revises a magnitude after initial publication, the revision governs provided it is published before 2:00 PM ET on October 21, 2026. A value first published after that time is not considered.
If the reported magnitude carries more than one decimal place, it is rounded to the nearest tenth using standard rounding conventions (0.05 rounds up). Brackets are inclusive of their stated endpoints.
If no earthquake data for October 20, 2026 has been published by 2:00 PM ET on October 21, 2026, this market will resolve to the "Under 5.3" bracket.
The resolution source for this market is the USGS Earthquake Catalog, maintained by the United States Geological Survey, at https://earthquake.usgs.gov/earthquakes/search/.
“What will the biggest earthquake be on October 20, 2026?” is a prediction market on Melbo. A share’s price reflects the probability of the outcome: on the correct outcome each share settles at $1, on the wrong one at $0.