// multi-utility computation suite · offline · instant · precise
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sci.volcano-VEI-ejecta-mass Calculator
Calculates the Volcanic Explosivity Index VEI from ejecta volume: VEI = log₁₀(V_km³) + 8, and estimates eruption column height and duration. VEI 8 supervolcano (Yellowstone, Toba): V > 1,000 km³, column > 25 km — the 1980 Mount St. Helens eruption was VEI 5 with 1 km³ ejecta.
Inputs
Vei
Reference formula or conversion factor shown for context.
Bulk Density Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.