You bet, but those downwind of prevailing winds, west to east/southeast will take the brunt.
I think they would be annihalated. A supervolcanoe is analogous to an asteroid of significance hitting this planet. It would be a world wide event in what it would belch out. Check out the Deccan Traps in India for an example. Its thought that that is what wiped out the dinosaurs. Not the asteroid in south america.