(2)
(3)
The need for a single curve tu cover the whole
yield range was recognized,
It was necessary to review the records for the
megaton shots in order to take into account the
frequency response of the equiprent,
(4) It was felt desirable to weigh the data according
.
to the nuxber of stations used in obtaining the
average period for each shot,
3,
Revised Yield Deta,
a. Tavles 1 through 7 give the periods at maximum acplitude
selected for each station for each U.S, shot,
be The mean of the periods fron all downwind and cross-wind
stations was computed for each shot in winter and summer. The mean of
all periods wes used in spring end fall,
ce. Only the acoustic portion of the wave train wes used in selecting the periods, That is, the cisporsive wave train was eliminated
from consideration as far as possible.
d. On the larger shots where signal periods exceeded about 25
seconds an attempt was made to take into account the frequency msponse of
the equipnent in selecting theperiod st maximum auplitude,
e.
all the cata,
A power-law curve was fitted by the method of least squares to
The standard ervor of estimate was elso computed,
f, Figure 2 gives the curve for period vs. yield and the 1, 2, and
3 standard error lines, The equation for this curve is given below,
Nog Y + 0.27955 = -3.14049 + 3.85977 log P
(5) «
whers Y = yi2zld in kilotons,
P = perlod in seconds.
This equation can be written approximately,
Y= 7.2 x 1074p3.9
4,
(6)
Discussion.
&
The data points pictted on Firwre 2 show thet the power-law given
by equation (6) fits the date very well for yields dow to 5 KT.
Below 5 xT
(S ,