The largest eruption in the past million years was at Toba in Indonesia. How big was it? It erupted over 3000 cubic kilometers of volcanic debris. 3000 cubic kilometers! That would pave the entirety of Rhode Island in a kilometer keep of ash, rocks, and pumice. It would take roughly 300 Pinatubo-scale eruptions to match that. The eruption itself created a caldera formed when the land collapsed when all that material erupted that spans 100 kilometers from end to end and 30 kilometers from sid