CAVANAGH: AMBIENT-NOISE MODELS 





OO 



120 



100 - 



80 



60 



40 - 



20 







HEAVY SHIPPING 



SHIPPING 



WIND FORCE 

 81 



SEA SURFACE- 



SEISMIC- 



I 







10 100 1000 10000 

 FREQUENCY (HERTZ) 



Figure 1. PREVAILING NOISE LEVELS 



804 



