My logic is fairly simple. Don't drop the bomb on Yellowstone. The question asks "Could a nuclear explosion set off Yellowstone" but it doesn't say you have to detonate at Yellowstone. read more
The explosion would then unleash feet of volcanic ash over all of the United States. According to Sivkov, Russia could also trigger just the volcano with a 'relatively small' megaton blast because it has shown signs of activity. Sivkov said that the normal nuclear deterrent was not good enough and too expensive given Russia's economic problems. read more