Never figured it out. I do remember this being brought up previously. I know, I think it was Casper, posted previous threads here on the same subject. I've experienced the quarry blasts and planes breaking the barrier. In the entire time I've lived here, I've never heard/felt a blast like that from the quarry nor had anyone else. I'd be willing to bet it was not caused by a jet, either. As I mentioned before, nothing about it was like that caused by any jet.
It's very strange. If I had the time, I'd pull some links, though I believe I mayv'e posted some in previous threads about this. So many people are hearing these very strange booms, unaccounted for, all over the world.