Zero VEI 4+ volcanic eruptions in 2026 priced at 29% on Polymarket

Zero-eruption outcome loses ground

Polymarket priced the chance of zero VEI 4+ volcanic eruptions in 2026 at 29%, down 3.5 percentage points, with $501K traded, according to the supplied market update dated Oct 17, 2026, at 5:09 PM ET.

The decline marks a shift away from the zero-eruption outcome. It reflects a change in traders’ pricing, not evidence on its own of a change in volcanic activity.

What the data establishes

According to predictionbubbles.net, its movers tracker measures probability-point changes over 24 hours using prices from Polymarket and Kalshi. It refreshes every 15 minutes; the supplied page lists a venue-data timestamp of 17 Oct 2026, 21:42 UTC.

The tracker ranks markets by the size of their probability moves, rather than trading volume or liquidity. The $501K traded provides context for this market, but the supplied summary does not specify the period covered by that figure.

The source excerpt explains the tracker’s methodology but does not include the eruption market’s individual listing, settlement terms or a reported catalyst. The material therefore supports an account of the repricing, rather than an explanation of what prompted it.

What it means for prediction markets

• Direction: The 29% price indicates that traders assign a minority probability to zero VEI 4+ eruptions in 2026.
• Magnitude: The decline is 3.5 percentage points, not a 3.5% relative decrease.
• Evidence limits: Neither the price move nor the $501K traded establishes a volcanic development or explains the trading shift.
• Resolution context: The supplied material does not identify the market’s qualifying-event criteria or settlement source.