Always wondered this. If Cell destroyed Earth or Even Freeza and his Father. Would the shock have released Buu or no? Shin was worried that blowing the ship up would release Buu. So I wondered what would happen if the earth blew up.
No way of really telling. Shin isn't the most reliable character for things. The only time he was really right during that whole arc was that Boo was dangerous. I suppose there's no real reason to doubt him on this matter though since it's fairly insignificant overall in the story proper.
So, assuming he's right about the ship explosion, I assume the Earth exploding would probably release Boo, too. Meaning the better question at that point would be whether Boo would survive said explosion. Bobbidi required quite a bit of energy to return Boo to full power for his release. I'd say it's entirely possible that the Majin would've been too weak to defend itself if released in the middle of the blast during those periods before being moved and all that.