This prediction market focuses on forecasting the number of large volcanic eruptions that will occur globally during the 2026 calendar year. A large eruption is defined as one with a Volcanic Explosivity Index (VEI) of 4 or higher. The VEI is a logarithmic scale from 0 to 8 that measures the explosivity of an eruption, similar to how the Richter scale measures earthquakes. A VEI 4 eruption ejects between 0.1 and 1 cubic kilometer of material and can have significant regional impacts, including ash clouds that disrupt aviation and climate effects from sulfur dioxide emissions. The market will resolve based on official data from the Smithsonian Institution's Global Volcanism Program (GVP), the world's primary repository for volcanic activity data. People are interested in this topic because volcanic eruptions are major natural hazards with global consequences. Accurate forecasting is difficult but important for disaster preparedness, climate modeling, and understanding Earth's geological activity. The number of large eruptions in a given year is variable, influenced by complex tectonic processes that are not fully predictable. This market provides a way to aggregate collective intelligence on a question with scientific, economic, and safety implications.

Historical Context

The systematic recording of global volcanic eruptions began in earnest with the founding of the Smithsonian's Global Volcanism Program in 1968. Before that, records were fragmentary, especially for remote regions. The Volcanic Explosivity Index itself was proposed by volcanologists Christopher Newhall and Stephen Self in 1982 to provide a consistent measure for comparing eruptions across history. Historical analysis shows that the frequency of large eruptions varies. The 20th century averaged about 3.3 VEI 4 or higher eruptions per year, but with significant clustering. For example, 1902 saw major eruptions of Mount Pelée (VEI 4) and Santa María (VEI 6). The late 20th century was relatively quiet for the largest events, with no VEI 6 or 7 eruptions between 1912 (Novarupta, VEI 6) and 1991 (Pinatubo, VEI 6). The 2010s saw several significant VEI 4 events, including the 2010 eruption of Eyjafjallajökull in Iceland, which caused unprecedented disruption to European air travel despite its moderate size, highlighting that impact is not solely dependent on VEI. The most recent VEI 6 eruption was Mount Pinatubo in 1991. The 2022 eruption of Hunga Tonga–Hunga Haʻapai was initially estimated as VEI 5 but its atmospheric effects were comparable to larger historical events, demonstrating ongoing challenges in classification.

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