>>508262779 (OP)partially devils advocate here, but the bunker busters actual explosion strength is actually not that impressive, its just they're designed to get that relatively small explosion deep underground.
could just be the anti-explosive defenses there are able to absorb the impact enough for alot of equipment to not pick it up. supposedly Irans bunkers have some advanced construction materials and other stuff to prevent damage from direct hits, assuming you trust them on that.
there also, of course, wouldnt be surface explosions from the bunker busters.