A supervolcano is a volcano whose eruption spews out more than 1,000 cubic kilometers (240 cubic miles) of matter, which is substantially larger than any volcanic event in historic times. The supervolcanic eruptions of the past 2 million years would include Yellowstone, Long Valley in eastern California, Toba in Indonesia, and Taupo in New Zealand. Other supervolcanoes would likely include the large caldera volcanoes of Japan, Indonesia, and South America. The most recent supervolcanic eruption on Earth occurred 74,000 years ago at the Toba Caldera in Sumatra, Indonesia.
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