wenis said:start to worry a bit more, pulled this off wiki (I think we can take this one as fact considering I don't think anyone goes out of their way to deface the "Caldera" article :lol)
"When Yellowstone Caldera last erupted some 640,000 years ago, it released about 1,000 km3 of dense rock equivalent (DRE) material, covering a substantial part of North America in up to two metres of debris."
or check out Supervolcano a docudrama.
I actually saw super volcano a couple of times on (iirc) Discovery channel and that shit really makes you think....
Let's hope it doesn't go ape shit in my life time