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Will a supervolcano erupt before 2050?

Aired 25 June 2026 · written 7 June, when Before Jan 1, 2050 was 30%

Will a supervolcano erupt before 2050? — episode poster
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The market we based this episode on

The board on 7 June 2026, the day the script was written. A price is the market’s odds of that outcome.

30% Before Jan 1, 2050 Not Before Jan 1, 2050 70%
Platform
Kalshi · real money
Resolves
1 January 2050
Volume traded
$34,967
Lifetime volume on this market is $34,967 — enough to read a trend, but thin enough that a single motivated trader can move the price.
Resolution criteria. If a supervolcano erupts before Jan 1, 2050, then the market resolves to Yes.

Why we chose it

The 22% on a supervolcano erupting before 2050 is wildly juicy as a number — base-rate-wise it should be near-zero, so something is driving the bid. That something is Campi Flegrei, the caldera under Naples that's been all over doom-Twitter and TikTok the past two years. Ground is rising ~10 mm/month (140+ cm total since 2005), seismicity hit 47–70 events/week in early 2026, gas emissions are elevated, and INGV has called it "accelerating unrest."A M4.6 quake on June 30, 2025 was felt across Naples — the strongest event there in decades. A 2026 arxiv paper flagging a possible "critical mechanical threshold" between 2030–2034 is the nerd-bait fueling the bet.

Realistic YES case: Campi Flegrei, Aira (Japan), or Taupō goes VEI-7+. Aira Caldera and Taupō are flagged "most likely to erupt." Realistic NO: USGS pegs Yellowstone's annual eruption odds at ~1 in 730,000, and even Campi Flegrei unrest historically resolves as phreatic burps, not super-eruptions. 22% is essentially "Naples panic premium" priced in.

The show’s read Before making an episode we research the market to judge whether it is worth one. This is what that research said about this bet — our reasoning, not reporting.

What we thought

SalThe Handicapper
EddieThe Philosopher
Sal
The line's drunk because it can't correct. Yes-buyers want the thrill, No-sellers want the yield, and nobody speaks up because this is a bet you can't collect if you win.
Eddie
Sal, the line's honest. It's people staring at twenty-five years of calendar and quietly admitting they don't trust the Earth not to explode.

How it’s moved since

Daily price. The dotted line is the day the episode was written — the odds Sal and Eddie were looking at. The solid line is the day it aired.

0% 10% 20% 30% 40% written 7 Jun aired 25 Jun 23 Apr 11 Jul 27 Sep Before Jan 1, 2050 29%
Written 7 Jun Aired 25 Jun Source: KALSHI

The market has barely moved since.