Tools chosen: kalshi_direct code_execution claude_news wikipedia kalshi_related polymarket_related

Sub-questions (Fermi decomposition)

Planner reasoning

This is a long-horizon, low-probability geophysical event whose answer hinges almost entirely on the base rate of VEI-8 (supereruption) events and the exact resolution definition. Key work: anchor to the Kalshi price, pin down the definition of 'supervolcano eruption', compute a Poisson base rate over ~25 years, and check for any current volcanic unrest (Yellowstone, Campi Flegrei, Toba, Taupo) that could shift probability above the base rate.

# Current state The market resolves YES only if a VEI-8 "supervolcano" eruption occurs before 2050-01-01. No supervolcano system is currently near eruption; all monitored calderas (Yellowstone, Taupō) sit at NORMAL/lowest alert levels, while Campi Flegrei (VEI-7 max historically, not a true VEI-8 supervolcano) shows decelerating unrest that INGV assesses as non-eruptive. Kalshi YES currently trades at 23.30%, far above any defensible geologic base rate. # Timeline of key events - **1982**: VEI scale established; VEI-8 defined as ≥1,000 km³ ejecta (confirmed, Wikipedia). - **~25,600 years ago**: Most recent confirmed VEI-8 eruption — Oruanui, Taupō, NZ (confirmed, Wikipedia). - **~631,000 years ago**: Last Yellowstone supereruption (Lava Creek Tuff) (confirmed, Wikipedia). - **2022-09-20**: Taupō raised to Alert Level 1 after seismicity/deformation (confirmed, Forbes/GNS). - **2026 (through Aug)**: Yellowstone remains at background seismicity (61 quakes in Aug, largest M2.0), NORMAL/GREEN alert, minimal deformation (confirmed, USGS). - **2026-01**: INGV study concludes current Campi Flegrei conditions do not support an eruption; decades of sustained uplift would be needed to approach 1538-eruption scale (confirmed, INGV/cronachedellacampania). - **2026-02 to 03**: Campi Flegrei uplift deceleration (25→15→10 mm/month) despite a Feb 23–Mar 1 quake swarm (~70 quakes, up to M3.5) (confirmed, uisjournal). - **2026-07-31**: M4.7 quake at Campi Flegrei, strongest since instrumental monitoring began (confirmed, Mappr/INGV). - **2026-02**: Taupō still quiet, low-level hydrothermal activity only (confirmed, VolcanoLive). # Event Will a supervolcano (VEI-8) eruption occur anywhere on Earth before January 1, 2050? # Outcomes to forecast - Yes - No # Kalshi market anchor **YES = 23.30%** (current). 7-day change: -6.40%; 30-day change: -0.70%. Range over 66 days: 18.20%–32.90%. Thin liquidity: ~51 contracts/day average volume. Price has drifted down recently but remains an order of magnitude above model-implied base rates. # Sub-question answers 1. **Definition used**: No explicit Kalshi rulebook text provided, but the description ("a supervolcano erupts") combined with the standard geologic definition (VEI-8, >1,000 km³ ejecta, Wikipedia) is the presumed resolution criterion. This is the industry-standard "supervolcano" definition, not a lower-VEI unrest event. 2. **Historical frequency**: Rougier et al. 2018 central estimate ~17,000-year recurrence interval; range 5,200–100,000+ years across studies; ~60 known VEI-8 events in Earth's history, most recent Oruanui ~25,600 years ago (code_execution; claude_news; Wikipedia). 3. **Cumulative 24-yr probability (2026–2050)**: Poisson model gives ~0.02%–0.46% depending on recurrence assumption, with central estimate (T=17,000 yr) ≈ **0.14%** (code_execution tool). 4. **Current unrest**: No system shows imminent-eruption signals. Yellowstone NORMAL/GREEN, magma chamber only 5-15% molten (USGS/volcanodb). Taupō Level 1 but quiet since 2022. Campi Flegrei has intensifying seismicity (record M4.7 quake, July 2026) but decelerating deformation and INGV explicitly states conditions don't support an eruption — and Campi Flegrei has never produced a VEI-8 (max VEI-7) (INGV; Wikipedia). 5. **Kalshi's implied probability**: 23.30% is ~50-1000x higher than any base-rate model estimate (~0.02–0.46%). This strongly suggests a lottery-ticket/tail-risk mispricing typical of long-dated, thinly-traded, low-probability markets, or possibly a market interpreting "supervolcano" loosely to include lower-VEI notable eruptions. 6. **Cross-checks**: No Polymarket equivalent exists (0 matches found). No other Kalshi volcano markets beyond this ticker itself — no independent cross-market validation available. # Key facts (high-confidence, factual) 1. [Wikipedia] VEI-8 = ≥1,000 km³ ejecta; last such eruption was Oruanui (Taupō) ~25,600 years ago. 2. [code_execution] Poisson base rate for 2026-2050 window: ~0.02%-0.46%, central ~0.14%. 3. [USGS] Yellowstone at NORMAL/GREEN, magma only 5-15% molten as of 2026. 4. [INGV] Campi Flegrei conditions "not compatible with an eruptive event" (Jan 2026 study); max historical VEI there is 7, not 8. 5. [Kalshi] Current YES = 23.30%, down from a 30-day high of 32.90%. # Cross-market signals - Kalshi related: Only this ticker itself found under "volcano"/"supervolcano" keywords — no arbitrage market. - Polymarket: No supervolcano/volcano/Yellowstone markets exist (0/100 scanned matched). - Sportsbook implied: N/A (not a sports category). # Analyst opinions and speculation - Claude_news synthesis: "No known supervolcano system currently shows unrest levels indicating an imminent VEI-8 eruption" — base rates support very low probability through 2050, with Campi Flegrei flagged as the most-watched (but non-VEI-8-capable) system. - No credentialed volcanologist source in this research asserts elevated near-term supereruption risk anywhere. # Directional lean per outcome - **Yes**: Weak support — only from generic acknowledgment that eruptions are possible and rare tail events can't be ruled out; Campi Flegrei's record seismicity adds narrative salience but not VEI-8 risk (that caldera tops out at VEI-7). - **No**: Overwhelming support — recurrence intervals (5,200–100,000+ yrs) imply <0.5% cumulative probability over the 24-year window; all monitored systems at background/normal alert levels; no historical precedent of VEI-8 in ~25,600 years. # Gaps / unknowns - Exact Kalshi resolution rulebook/settlement source not provided — ambiguity on whether a smaller VEI-7 "supervolcano" media event could trigger YES via loose interpretation. - Toba and Long Valley current status not covered in research (assumed background, unconfirmed). - No visibility into why Kalshi market prices 23%+ despite negligible geologic base rate (structural mispricing vs. unknown resolution nuance). # Calibration anchors - Kalshi current YES price: **23.30%** (anchor, likely overpriced). - Base-rate models: ~0.02%–0.46% (central ~0.14%) probability of VEI-8 eruption in 24-year window — a ~50-1000x gap versus market price. - Precedent: long-dated, thin-volume Kalshi tail-risk markets often show similar lottery-ticket overpricing for near-zero-probability catastrophic events.

1. Both forecasters converge on identical 2.5% despite different confidence levels (0.85 vs 0.74), yet neither explains why 2.5% specifically—this is ~18x the central base-rate estimate (0.14%), a large hedge for "resolution ambiguity" that isn't quantified or justified with any probability distribution over possible rulebook interpretations. 2. Neither forecaster explicitly weighs the Kalshi price (23.30%) as a signal of possible information they lack—e.g., an actual settlement source or historical Kalshi precedent for "loose" resolution on catastrophe markets—despite the brief flagging this as an unresolved gap ("Gaps/unknowns: exact Kalshi resolution rulebook... not provided"). They dismiss the price as pure mispricing without seriously entertaining that Kalshi's own resolution criteria might differ from the strict VEI-8 definition. 3. Both ignore the brief's explicit unknowns on Toba and Long Valley ("current status not covered in research, assumed background, unconfirmed")—if either system has any elevated unrest not captured in this brief, the tail risk could be understated; forecasters state high confidence without acknowledging this monitoring blind spot. 4. Neither forecaster discusses the discrepancy between the two 30-day price trend signals (down 6.4% over 7 days, near 30-day low of 18.20%-32.90% range) as weak evidence the market itself may be correcting toward the geologic base rate—if so, waiting or trusting the trend could argue for an even lower "Yes," which neither incorporates into their point estimate reasoning. 5. Both forecasters treat "resolution risk" as a symmetric hedge (only pushing Yes up), but a loose interpretation of "supervolcano" could just as plausibly not resolve YES for a VEI-7 event (i.e., Kalshi might strictly require VEI-8 per the standard definition as stated in the brief), meaning the hedge might be one-directional overcorrection with no equal consideration of the base case being even more strongly No. 6. Confidence levels (0.85 and 0.74) are unusually high for what is fundamentally a low-probability, deep-tail geologic forecast over 24 years with genuine unknowns (rulebook ambiguity, unmonitored systems); given these gaps, more epistemic humility (lower confidence bands or wider uncertainty ranges) would better reflect the actual evidentiary limits described in the brief.

2% (80% confidence)

Yes: 2% No: 98%

Geologic base rates are decisive: with recurrence intervals of 5,200–100,000+ years and the last VEI-8 eruption ~25,600 years ago, the 24-year cumulative probability is ~0.02%–0.46% (central ~0.14%), and no monitored system shows anything approaching pre-eruptive conditions. The Kalshi 23.30% anchor is a classic lottery-ticket mispricing in a thin, long-dated tail market — and its recent downward drift toward the range low weakly supports the market itself correcting toward the base rate. The critique is right that the 2.5% consensus embeds an unjustified 18x hedge, and that resolution ambiguity cuts both ways (a strict VEI-8 reading makes NO even more secure); however, the unverified rulebook and unconfirmed Toba/Long Valley status warrant retaining a modest hedge above the raw base rate. I set Yes at 2%, dominated by resolution-interpretation risk rather than any physical eruption probability.

Total pipeline time: 108.3s