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What will the biggest earthquake be on October 21, 2026?
polymarket

What will the biggest earthquake be on October 21, 2026?

Outcome
Trade
Chance %
Price
Spread
Liquidity
Volume
24h
7d
Open Interest
Ends in
Result

Description

This market will resolve to the bracket containing the magnitude of the largest earthquake recorded globally on October 21, 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 21, 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 22, 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 21, 2026 has been published by 2:00 PM ET on October 22, 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/.

Polymarket

This market will resolve to the bracket containing the magnitude of the largest earthquake recorded globally on October 21, 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 21, 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 22, 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 21, 2026 has been published by 2:00 PM ET on October 22, 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/.

Frequently asked questions

On Polymarket, the dashboard for the October 2026 earthquake market tracks the implied probability of different magnitude ranges occurring on October 21, 2026. You’ll find the current odds displayed for each potential outcome, along with a price history chart showing how those odds have shifted over time. The dashboard also shows the 24-hour trading volume, currently at $2,124, and the total market volume, which is $3,345. This provides a clear overview of market activity and sentiment surrounding the likelihood of various earthquake magnitudes.

Currently, prediction market odds represent a different perspective than traditional analyst forecasts for earthquake probabilities. While seismologists provide long-term risk assessments, this market focuses on a specific date and allows traders to incorporate a wider range of information, including real-time data and subjective interpretations. It's important to note that analysts typically don't offer precise magnitude predictions for a single day, making a direct comparison challenging. However, observing discrepancies between the market’s implied probabilities and expert opinions can be insightful.

On Polymarket, this market is priced through a continuous double auction, meaning traders buy and sell contracts representing different earthquake magnitude ranges. The price of each contract reflects the market's collective assessment of the probability of that magnitude occurring. As more traders participate and new information emerges, the prices adjust accordingly. On Polymarket, prices reflect that venue's order book, liquidity, and how traders price the outcome right now. The market’s depth and liquidity, indicated by the trading volume, also influence price movements, as larger volumes generally lead to more stable and efficient pricing.

This market resolves around Oct 22, 2026, with the outcome confirmed once the event is verifiable from credible public reporting. The magnitude of the largest earthquake recorded on October 21, 2026, will be used to determine the winning outcome. Data will be sourced from established seismological agencies and their publicly available records. The resolution will be based on the Richter scale measurement, representing the most significant seismic event on that date, as reported by these trusted sources.

Several signals could significantly impact this market. Major aftershocks from recent earthquakes, or the discovery of new fault lines, could shift trader sentiment. Increased or decreased volcanic activity in seismically active zones could also influence the market. Furthermore, any significant updates from geological surveys or changes in long-term earthquake risk assessments could lead to price fluctuations. Finally, even heightened media attention surrounding earthquake preparedness or predictions could drive trading activity and move the odds in this market.