LONG RANGE BLAST DAMAGE

LONG RANGE BLAST DAMAGE
There was no consistency in the long range blast damage.
Observers often thought that they had found the limit, and
then 2,000 feet farther away would find further evidence
of damage.
The most impressive long range damage was the collapse
of some of the barracks sheds at Kamigo, 23,000
feet south of X in Nagasaki. It was remarkable to see some
of the buildings intact to the last details, including the roof
and even the windows, and yet next to them a similar building
collapsed to ground level.
The limiting radius for severe displacement of roof tiles
in Nagasaki was about 10,000 feet although isolated cases
were found up to 16,000 feet. In Hiroshima the general

limiting radius was about 8,000 feet; however, even at a
distance of 26,000 feet from X in Hiroshima, some tiles
were displaced.
At Mogi, 7 miles from X in Nagasaki, over steep hills
over 600 feet high, about 10% of the glass came out. In
nearer, sequestered localities only 4 miles from X, no damage
of any kind was caused. An interesting effect was noted
at Mogi; eyewitnesses said that they thought a raid was
being made on the place; one big flash was seen, then a
loud roar, followed at several second intervals by half a
dozen other loud reports, from all directions. These successive
reports were obviously reflections from the hills
surrounding Mogi.