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17 August 1956
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Weaféens Jest Pota AMAT
LEMORANDIDY FOR THE RECORD:
SUBJECT:
1,
(@gghit} Revised Acoustic Signal Period vs, Yield Data
General.
Subsequent to the Tezpot series (February - May 1955), .
TD~2 reviewed all acoustic data and revised the signal period vs, yield
curves, This memorandum presents the latest information reganiing deter~
mination of bozb yield from acoustic periods,
2.
Backrround,
a.
Period vs. yield curves stow in Figure 1 were used prior to
1 February 1956, These curves were obtained using data from Greenhouse,
Buster-Jangle, Tumbler-Snapper, Ivy, Upshot-Knothole, and Castle. An
average period at maximim amplitude was obtained by averaging data from
all cross-wind and down-wind stations for each shot,
Regression lines
and standard errors of estimate were obtained without weighing. Two
power-law curves were computed, one using data from shots of 0.2 to 550 KT
and the other using data from shots of 10 to 15,000 KT.
The equation for
the lower yields follows:
log Y + 0.2787 = -2,00316 + 2.84612 log P
(1)
wnere Y = yield in kilotons,
P = period in seconds.
This can be written approxirztely,
Y = 1.0 x 1072p2.8
(2)
é
The equation for the higher yields follows:
(3)
Log Y + 0.16352 = 3.43646 + 4.05216 log P
This can be written approximtely,
Y = 3.7 x 1o-tph.0
(4)
A correction was made for small sexple in cocputing the error
of estinate for the higher yields,
.
b.
Several factors mde it desirable to revise the period vs. yield
(1)
\
The Teapot data became available and needed to be edded
to other data,
;
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