300 400 



2000 3000 4000 



FREQUENCY, Hz 



Figure 4.14. Propagation loss for optimum receiver depth vs frequency for 

 ranges of 50, 100 and 150 km. Korea Strait winter profile without the top 

 sediment sand layer; source depth 25 m. 



80 



1 



r 1 1 1 1 I 



1 1 1 1 1 I I T 





100 



- 



^ 



KOREA STRAIT SUMMER PROFILE 



(NO SAND LAYER) 



100 m SOURCE 



- 



120 





\ ^ 



\ 25 km RANGE 



~ 



140 





\ 





~ 



160 



- 



50 km \ 





- 



180 



- 





\ \ 



- 



200 

 99n 



1 



1 1 1 1 1 1 



A 1 1 1 1 L 1 1 



\ 



200 300 



FREQUENCY, Hz 



Figure 4.15. Propagation loss for optimum receiver depth vs frequency for 

 ranges of 25 and 50 km. Korea Strait summer profile without the top 

 sediment sand layer; source depth 100 m. 



51 



