Northrop 



3000 4000 5000 6000 



7000 8000 9000 

 Distance, km 



10000 moo I2000 13000 



Fig. 6 - So\inci pressure level vs range for CHASE V 

 hydroacoustic waves. Pressure level is in dB above 

 background noise. Slope of calculated curve is 4.5 dB 

 per distance doubled (Reference (10)). 



41 



