Slashdot | Is the Yellowstone Supervolcano About To Blow? and on to Scientists eye unusual swarm of Yellowstone quakes which was followed by Yellowstone Caldera, then Supervolcano and finally Laki Fissure. I travelled along the Laki Fissure in 1997. it is purported to have caused the french revolution when it blew… and the mississippi river to freeze at New orleans. Cool beans.