“The Toba eruption (the Toba event) occurred at what is now Lake Toba about 67,500 to 75,500 years ago. The Toba eruption was the latest of a series of at least three caldera-forming eruptions which have occurred at the volcano, with earlier calderas having formed around 700,000 and 840,000 years ago. The last eruption had an estimated Volcanic Explosivity Index of 8 (described as “mega-colossal”), making it possibly the largest explosive volcanic eruption within the last twenty-five million years.”
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“The Toba caldera is the only supervolcano in existence that can be described as Yellowstone’s “bigger” sister. With 2,800 km3 of ejecta, it was an even greater eruption than the supereruption (2,500 km3) of 2.1 million years ago that created the Island Park Caldera in Idaho, USA. The eruption was also about three times the size of the latest Yellowstone eruption of Lava Creek 630,000 years ago.”
en.wikipedia.org/wiki/Lake_Toba

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