@farmerman,
farmerman wrote:Blast overpressure and firestorm can leave a stanard ring around a normal blast area. However, Ive seen the pix of Hiroshima where a few buildings were actually spared from both and were looked on as miracles.Ive never looked into the why it was so, do you hqve any sources that can speak of these things??
Not off hand. But just speculating, an adjacent building may absorb a lot of the shock wave and the surviving building may have been constructed and positioned just in the right way to resist what blast does hit it. Also topography could influence the path of the blast in areas.
farmerman wrote:Im sure the folks who were around were dead within a few weeks if not immediately.
Depends on their exposure to radiation. The first second of the explosion there was a lot of radioactivity from unstable fission fragments with very short half lives. But that too falls off with distance. If you are far enough away so that you have a fair chance of surviving blast, you are also more distant from the source of radiation.
It was easier to assess danger levels back in the days of really huge H-bombs, where a single bomb would destroy an entire urban area. "In the center of the city" was bad, and the further away from the center you were, the better your odds.
Now if an urban area is peppered with a dozen small MIRVs, someone near the center of the city might happen to be between explosions and survive (if they practiced Duck and Cover), while someone out in the suburbs might happen to be right at the center of an explosion.
farmerman wrote:The"duck and cover" phrases were more like marketing of "fat busters", It gave a false sense of security that, like a gamma burst, could be over before you can say "HEY...WHAT'S THA...."
There would certainly be people who would not be saved by Duck and Cover, but it would be a shame for someone to needlessly die because they didn't bother with Duck and Cover and they were one of the ones who could have been saved.
Kind of like deciding not to wear a seat belt because there are some accidents that will kill you even with a seat belt, and then dying from an accident where the seat belt would have made a difference.