Tools chosen: kalshi_direct wikipedia claude_news code_execution kalshi_related polymarket_related

Sub-questions (Fermi decomposition)

Planner reasoning

This is a very long-horizon geological question resolving on whether a supervolcano (VEI-8 eruption) occurs before 2050. The base rate is extremely low, so the key is establishing the historical eruption frequency and current activity at known supervolcanoes. Market price is the anchor.

# Current state The market asks whether a VEI-8 supervolcano eruption will occur before Jan 1, 2050. No supervolcano is currently showing signs of imminent eruption; the most restless system (Campi Flegrei) does not qualify as VEI-8 capable. Resolution requires an actual VEI-8 event. # Timeline of key events - **~25,600 BP**: Last confirmed VEI-8 eruption — Oruanui, Taupō, NZ [Wikipedia, confirmed] - **~640,000 BP**: Last Yellowstone supereruption [Wikipedia, confirmed] - **2005–present**: Campi Flegrei enters ongoing unrest phase; yellow alert since 2012 [Nature 2025, confirmed] - **2025-01**: USGS Nature study maps Yellowstone magma: ~400–500 km³ rhyolite, not currently eruptible [BBC Science Focus, confirmed] - **2025-03-13**: Campi Flegrei M4.6 earthquake — largest since seismic monitoring began 1970 [Nature 2025, confirmed] - **2025-05**: Study: Campi Flegrei unrest driven by geothermal reservoir pressure, not magma ascent [ScienceDaily, confirmed] - **2025-07 to 2026-01**: Yellowstone brief caldera rim uplift episode; ceased by Jan 2026, now background levels [USGS, confirmed] - **2026-06-13**: Biscuit Basin hydrothermal explosion at Yellowstone — small, non-magmatic [USGS, confirmed] --- # Event Will a supervolcano (VEI-8) erupt before Jan 1, 2050? # Outcomes to forecast - **Yes** — a VEI-8 eruption occurs before Jan 1, 2050 - **No** — no VEI-8 eruption occurs before Jan 1, 2050 # Kalshi market anchor **⚠️ PRIMARY ANCHOR: 32.00% YES** (KXERUPTSUPER-0-50JAN01) - 7-day change: **+7.00%** | 30-day change: **+10.00%** (strong recent upward drift) - Price range over 82 days: 16.80%–32.90% - Avg daily volume: 68 contracts (thin, retail-dominated market) - **This price is ~640–1,000× higher than the geological base rate implies.** The drift is almost certainly noise/retail speculation, not new information. # Sub-question answers 1. **Historical VEI-8 recurrence interval** — Approximately 1 per 50,000–100,000 years globally, based on the record of known supervolcano systems (Yellowstone at ~640 ka, Toba at ~74 ka, Oruanui at ~25.6 ka). [Wikipedia, code_execution] 2. **Imminent eruption signs at known systems** — No system shows magmatic signs consistent with near-term VEI-8. Yellowstone is at NORMAL/GREEN alert; Campi Flegrei is at yellow alert but its largest eruptions are VEI-7, not VEI-8, and current unrest is geothermal/hydrothermal, not magmatic. [USGS, Nature 2025, ScienceDaily 2025] 3. **Kalshi market price** — Currently 32.00% YES, up sharply (+10 pp in 30 days). [kalshi_direct] 4. **Resolution definition** — Wikipedia and VEI scale define supervolcano eruption as VEI-8 (>1,000 km³ ejecta). Kalshi rules are not explicitly stated but market title aligns with this definition. [Wikipedia] 5. **Annualized probability from base rate** — ~0.001%–0.002% per year; over 25 years, cumulative P ≈ **0.03%–0.05%** under a Poisson model. [code_execution] # Key facts (high-confidence, factual) 1. [Wikipedia] Last VEI-8 eruption: Oruanui, Taupō, ~25,600 years ago 2. [Wikipedia] Campi Flegrei max VEI is 7 — does NOT qualify as a supervolcano by strict definition 3. [USGS] Yellowstone alert level: NORMAL/GREEN as of April 2026; magma reservoir not currently eruptible 4. [Nature 2025] Campi Flegrei unrest driven by geothermal pressure; magma reservoir needs ~2–3 more decades to reach prior eruption size (and that would be VEI-5/6, not VEI-8) 5. [code_execution] Poisson-modeled P(VEI-8, 25 yr window) ≈ 0.03%–0.05% # Cross-market signals - **Kalshi related**: Only one market found (the event itself) — no corroborating or contradicting markets - **Polymarket**: No supervolcano markets found; unrelated "eruption" hit (Iran airspace) ignored - **Sportsbook**: None found # Analyst opinions and speculation - [USGS/Mike Poland] Yellowstone's most likely future activity is lava flow, not supereruption; "tens to hundreds of thousands of years of nothing" expected [Cowboy State Daily 2025] - [BBC Science Focus] Toba-scale warning signs may be minimal, but no current system shows precursors - [NPR 2025] Campi Flegrei scientists: eruption risk "not zero," but would likely be Monte Nuovo-scale (VEI-2/3), not supereruption - The Kalshi price surge (+10 pp/30 days) is almost certainly driven by retail attention (media coverage of Campi Flegrei unrest, Yellowstone hydrothermal events), not geoscientific signal # Directional lean per outcome - **Yes (32% on Kalshi)**: No supporting geological evidence. Kalshi price is ~640–1,000× above base rate. Recent price increases appear to be retail noise from media coverage. - **No**: Overwhelmingly supported by: geological recurrence intervals, current monitoring status of all major systems, scientific consensus, and Poisson modeling. True probability of YES is ~0.03–0.05%. # Gaps / unknowns - Exact Kalshi resolution criteria (is VEI-7 sufficient? unclear from rules) - Whether market could be exploited: thin volume (68 contracts/day) means large actors could move price but also that current price is unreliable - Unknown/unmonitored submarine supervolcanic systems # Calibration anchors - **Kalshi current YES price: 32.00%** — treat as noise, not consensus - **Geological base rate**: ~0.03–0.05% over 25 years (Poisson) - **Precedent**: No VEI-8 eruption in recorded human history (last ~25,600 years ago) - **Thin market caveat**: 68 contracts/day; price susceptible to retail herding; 30-day drift of +10 pp has no geological basis **Assessment**: True probability ≈ 0.05–0.5% (allowing a wide uncertainty band for unknown unknowns and possible VEI-7 resolution ambiguity). Kalshi's 32% is dramatically overpriced by ~50–100×.

1. Both forecasters correctly dismiss the Kalshi 32% price as retail noise, but neither explicitly addresses whether the resolution criteria might accept a VEI-7 event — the brief flags this as a genuine gap ("is VEI-7 sufficient? unclear from rules"), and if Kalshi resolves on a looser definition, the base rate jumps substantially (Campi Flegrei and similar systems could produce VEI-7). 2. Both forecasters set Yes=0.025 (2.5%), which is roughly 50× above the geological base rate of 0.03–0.05% — this upward adjustment is reasonable but neither provides explicit reasoning for landing at exactly 2.5% rather than, say, 0.5% or 0.1%, making the calibration feel arbitrary rather than derived. 3. Neither forecaster engages with the unknown/unmonitored submarine supervolcanic systems mentioned in the brief; these represent a tail risk that could meaningfully inflate the true probability beyond simple Poisson modeling of known land-based systems, yet both treat the geological record as complete. 4. Both forecasters are internally inconsistent: they describe their confidence as "high" while simultaneously acknowledging the resolution ambiguity (VEI-7 vs VEI-8) and the unknown-unknowns caveat — those factors should suppress confidence to "medium" at best given genuine definitional uncertainty. 5. Neither forecaster considers the possibility that the 30-day Kalshi price drift (+10 pp) could reflect market manipulation or a single large retail buyer in a thin 68-contract/day market, which is relevant to assessing whether any information is embedded in the price signal versus pure noise herding.

3% (80% confidence)

Yes: 3% No: 97%

Geological base rate for a VEI-8 over 25 years is ~0.03-0.05%, and no monitored system shows magmatic precursors. The Kalshi 32% is retail noise in a thin market. Both forecasters converge on ~2.5% YES; I keep a small buffer for VEI-7 resolution ambiguity and unmonitored submarine systems, landing at 3%.

Total pipeline time: 112.2s