1446 
SURFACE 
VI. THE RANGE OF DISTORTION 
For distances larger than the initial distance the attenu- 
ation (rarefaction wave-reflected wave) is traveling along the 
primary wavefront of the considered spherical shockwave. This 
attenuation will propagate farther as the shockwave propagates. 
For getting the mathematical formulation of this distortion the 
following case will be considered: 
d : 
t | 
P PRIMARY 
Us AVE 
WATER 
The shockwave is produced by a charge in a depth d 
(expressed in charge radii). The primary wave has travelled 
over a distance Fr (expressed in charge radii). A point P in 
a depth ¥(y¥ <4) shall be considered on the original wavefront 
and it is assumed that this point P just defines a point on 
the boundary between distorted and undisturbed peak pressure. 
The undistorted propagation of the peak pressure during 
a certain time interval dt is dr = Ddt . In that time the 
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