I don't know if the underground bunkers for the elite will withstand the impact of a strike, or not. I hope it doesn't!!! I grit my teeth went I read how they are hoping to escape the impact of what's to come, while leaving the rest of us up here to deal with the devastation!! I don't know where would be a safe place.
I think the elite will bunker down in their bunkers in W.Virginia, N. Mexico, Denver, Cheyene Mountain. Those on the surfice will perish, except for a few who were in the right place at the right time....maybe a few spelunkers?
All modern conviences will be gone...people will be few and far between. Little pockets will procreate, but it will take many,many generations to repopulate the earth. They will tell their children stories about sky travel, and atomic bombs, and many other wonderous things. The children will mwke these stories part of their oral tradition, and a few generations of retelling, they will become a bit distorted.
Never having witnessed such advanced technology, it will become 'folklore' after many generations. much Every so often, those holed up in their bunkers will venture out to check on the healing progress of the earth and how humanity is increasing. Every once in a while, the far-future generations will spot one of these craft, and with their mix of religious tales and folklore of a highly advanced civilization, they will proclaim these UFO's to be from another galaxy far,far away.