DIFFRACTED SEISMIC WAVES 



117 



When the diffracting edge hes on the interface, the following may be 

 noted. As can easily be seen, in order to calculate the dynamic hodographs 

 in such a case, we must assume A = and confine ourselves to values of 

 x>0. 



The shape of the diffracted wave in a case where the incident wave has the 

 shape of a smooth alternating pulse (22) can be found from formula (24). 



Fio. 10. Calculation dynamic hodographs of a diffracted wave a-horizontal com- 

 ponent of displacement, u^; 6- vertical component of displacement, v^. 



