Will California experience a 7.0 or above magnitude earthquake in 2026?
PM $7.4K
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Will California experience a 7.0 or above magnitude earthquake in 2026?
PM $7.4K
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1
Current odds
Snapshot from
As of Oct 30, 2026, 3:00 AM UTC, Yes is priced at 4.9% on Polymarket.
Polymarket
- Yes4.9%
Yes prices. They are not order quotes; check each platform's rules, fees and live prices before trading.
AI Analysis
Trader mode: Market mechanics, assumptions and risks
PM $7.4K
Reported volume · provider units
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Source snapshot: Oct 30, 2026, 3:00 AM UTC
About This Event
This market will resolve "Yes" if the United States Geological Survey (USGS) (https://www.usgs.gov/programs/earthquake-hazards/lists-maps-and-statistics) reports at least one earthquake of moment magnitude (Mw) 7.0 or greater with an epicenter located within the state of California by December 31, 2026 at 11:59:59 PM ET. Otherwise, this market will resolve "No". The state of California includes the entirety of California as recognized under U.S. law including offshore areas within California's territorial boundaries. Earthquakes occurring on the California border must have their USGS-listed epicenter coordinates fall within California's boundaries. Any individual event meeting the magnitude and location criteria resolves the market "Yes", regardless of whether it is classified as a mainshock, aftershock, or foreshock. Resolution will be based on the USGS's final reviewed magnitude, not preliminary estimates, regardless of when that review is published, but the qualifying earthquake needs to have occurred within California by December 31, 2026 at 11:59:59 PM ET. This market will resolve based on official information from USGS, however, an overwhelming consensus of credible reporting confirming a qualifying earthquake may also resolve this market in an instance where USGS becomes unavailable.
This analysis is awaiting a background update, so its prices may be older than the odds above.
Snapshot observed 2026-10-19T00:00:05.826Z. This analysis describes that snapshot and is not a live news update.
What the contract measures
The contract asks whether California will have a 7.0 or greater earthquake in 2026. It resolves "Yes" if the United States Geological Survey (USGS) reports at least one earthquake of moment magnitude (Mw) 7.0 or greater with an epicenter inside California [1]. The rules state that "Any individual event meeting the magnitude and location criteria resolves the market "Yes", regardless of whether it is classified as a mainshock, aftershock, or foreshock" [1]. Offshore areas within California's territorial boundaries count, and border events must have USGS epicenter coordinates inside the state [1].
The rules also say resolution uses "the USGS's final reviewed magnitude, not preliminary estimates" [1]. They allow an "overwhelming consensus of credible reporting" to resolve the market if USGS becomes unavailable [1]. The qualifying earthquake must occur by December 31, 2026 at 11:59:59 PM ET [1].
The listed end time is "2026-12-31T16:59:00.000Z" [1]. That timestamp does not match the 11:59 PM ET wording on its face, so readers should check the rule text rather than assume the two are identical.
Reading the snapshot
The provider observed this market at 2026-10-19T00:00:05.826Z, and this record was retrieved at 2026-10-19T01:54:01.844Z [1]. The snapshot is therefore a record from earlier today, not a live quote. The market status is recorded as active [1].
The saved prices are Yes at 0.0465 and No at 0.9535 [1]. These are snapshot prices, not executable quotes or verified probabilities. The two outcomes sum to 1.0 in this record.
This event contains one market, and the coverage record shows that all saved markets were included [1]. The sample is not partial, but it covers only this provider event. It does not establish that the provider lists every possible outcome for California earthquakes.
What remains uncertain
The evidence does not explain why the price sits where it does, and it does not show how many traders hold each position. Trading volume is not included here, and volume alone would not indicate liquidity.
The record also does not describe any earthquake activity, USGS reports, or news after the observation time. Its prices cannot be compared with prices on other platforms without matching the rules, end times, and resolution sources. Differences in wording or close times can make apparently similar contracts non-comparable.
References
- Polymarket: Will California experience a 7.0 or above magnitude earthquake in 2026?. Provider data observed 2026-10-19T00:00:05.826Z.
AI-generated analysis based on market data. Not financial advice.
Saved Oct 19, 2026 UTCThis saved content is awaiting a background update. It may contain outdated claims; use the dated market data and provider rules for the latest available information.
Overview
This PredictPedia contract asks whether an earthquake of moment magnitude (Mw) 7.0 or greater will have an epicenter within California during 2026. According to the contract rules, the market resolves "Yes" if the United States Geological Survey (USGS) reports at least one such earthquake located in California by December 31, 2026 at 11:59:59 PM ET, and resolves "No" otherwise [1]. The provider listed the market as active when it was observed, with a listed end time of 2026-12-31T16:59:00Z, which matches the 11:59 PM ET deadline in the rules [1]. That deadline is a rule of the contract, not an announced date for any earthquake. An earthquake is the shaking of the Earth's surface caused by a sudden release of energy in the lithosphere that produces seismic waves, and its size can range from events too weak to be felt to events violent enough to damage infrastructure [2]. Magnitude is the standard way of describing that size. The contract uses moment magnitude, and it sets the threshold at 7.0, so the question is whether a single event of that size or larger occurs within the defined state boundaries during the contract period. The rules cover several details that shape how the question resolves. The state is defined to include the entirety of California as recognized under U.S. law, including offshore areas within California's territorial boundaries [1]. For earthquakes near the California border, the USGS-listed epicenter must fall within California's boundaries [1]. A single qualifying event is enough, and it counts whether it is classified as a mainshock, aftershock, or foreshock [1]. The rules also specify which figures count. Resolution uses the USGS's final reviewed magnitude rather than preliminary estimates, regardless of when that review is published. However, the qualifying earthquake itself must have occurred in California by the December 31, 2026 deadline [1]. The rules state that resolution is based on official USGS information, but that an overwhelming consensus of credible reporting confirming a qualifying earthquake may also resolve the market if USGS becomes unavailable [1].
Why It Matters
The contract measures whether a single earthquake of at least magnitude 7.0 with an epicenter inside California is reported by the USGS before the deadline. Because one qualifying event is enough, the question concerns the occurrence of a large earthquake in a defined region over a fixed period rather than any cumulative count [1]. Magnitude 7.0 is a high threshold on the scale used for the contract, and the contract's precise definitions of state boundaries, offshore coverage, and reviewed magnitude determine how an event is judged [1]. The general seismic background comes from an encyclopedia description of earthquakes and seismic activity [2]. A Wikipedia list of 2026 earthquakes covers events of magnitude 6 or above and states that its magnitudes are based on USGS data [3]. That list is a background reference and is not named as the resolution source in the contract rules [1][3].
Snapshot context
The latest published provider snapshot for this topic was observed on 2026-10-19 at 00:00 UTC. It contains listings from Polymarket. Market descriptions and listed closing times define the contracts; they do not establish that the real-world outcome has occurred. This article does not include a separately verified news update. [1]
Frequently Asked Questions
What magnitude and location does the contract require?
The contract requires an earthquake of moment magnitude 7.0 or greater with a USGS-listed epicenter within California, including offshore areas within the state's territorial boundaries [1].
Do aftershocks or foreshocks count?
Yes. Any individual event that meets the magnitude and location criteria resolves the market "Yes", regardless of whether it is classified as a mainshock, aftershock, or foreshock [1].
Which magnitude figure is used for resolution?
Resolution uses the USGS's final reviewed magnitude rather than preliminary estimates, regardless of when that review is published [1].
Does the earthquake have to occur before the deadline?
Yes. The qualifying earthquake needs to have occurred within California by December 31, 2026 at 11:59:59 PM ET [1].
What happens if the USGS is unavailable?
The rules say an overwhelming consensus of credible reporting confirming a qualifying earthquake may also resolve the market in that situation [1].
AI-written background. References identify the evidence used; Wikipedia links under Learn More are additional reading. Prices and provider rules are dated snapshots. This is not financial advice.
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