38 



V. P. GORBATOVA 



This increases in proportion to the difference in the acoustic rigidities 

 at the interface, in inverse proportion to the bedding depth h^ and in direct 

 proportion to h^^. 



The intensity of reflected (longitudinal) waves above the shot point does not 

 depend on the value of the transverse velocities. For media where the 

 difference in acoustic rigidities is such that they are uniform but Vq p<^Vj^ 

 in one while in the other Vq ';> v^ when Vq and ^q coincide in both me- 

 dia, the intensity of the reflected waves above the shot point is equal. 



10 



■5 0-5 



Fig. 10. Curves for the damping of single reflected waves in two-layered media. 



It diminishes with distance from the observation point along the free sur- 

 face of the medium and is determined by formulas (6) and (7). The rate 

 at which the intensity diminishes ceases to be uniform for media where 

 ^0, p ^ ■^i n ^^^ ^0 p ^ ^1 p ^^^ depends on the transverse velocity values. 

 For media where t;^ < z;.,^ it depends on the ratio between the longitudinal 

 and transverse velocities in a half-space and for media where Vq > v^^ 

 it depends on this value both in a half-space and in a layer. 



Figure 10 shows curves for the damping of reflected wave intensity ■\\dth 

 distance for media where Vq <i v^ (continuous lines) and for media 

 where Vq '> v^ (dotted lines); it can be seen that if A, the reflected 

 wave will dampen more quickly the greater the parameter. Conversely 

 if Vq^ > ■yj , the intensity will dampen more rapidly the greater the pa- 

 rameter A and the smaller the parameter 7 at a fixed A. Given the same 

 A in media where v^^ > v^^ the reflected waves will dampen with dis- 



