———> A in Megametres 
VEU VED SAVES RO FO BOE MOS ME Ae NS 
hm in 
Kilometres 
500 
1000 
1500 
3000 
3500 
PLATE 6.—Showing maximum depth of seismic rays as function of epicentral distance 
(after Zoppritz). 
Plate 6 shows the maximum-depth (im) attained as a function of the epicentral 
distance A, for 
I. The first phase P as observed. 
II. The second phase S as observed. 
Ill. Theoretical straight rays with constant speed. 
