No, we don't mean Poison Mushroom. A discussion of what nuclear weapons actually do. For this discussion, we will detonate a 1 megaton (fairly small compared to some ICBMs with over 10 megaton payload) nuclear weapon in Los Angeles. 500 South Buena Vista Street, Burbank, California (Lat 34.155744, Lon -118.326766) will be ground zero and the bomb will detonate on the ground.