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Read into it last night and you right on all accounts. However I stand by my assessment that any of them going off is bad for everyone involved.Toba has the larger caldera, larger magma chamber and highest amount of magma.. However the US should just be happy that the 2 worst are pretty much dead. Wah Wah Springs was the mother of all eruptions. The La Garita caldera wasn´t far behind Wah Wah. Roughly 5500km3 material for Wah Wah and 5000 for La Garita vs 2800-3200 for Toba and 2200-2400 for Yellowstone. Mt Tambora in 1815 was roughly 160km3. Mt St Helens was like 4km3