^4ARTIN/PERR0NE : GEOGRAPHICAL VARIATION OF AMBIENT NOISE IN THE OCEAN 

 FOR THE FREQUENCY RANGE FROM 1 HERTZ TO 5 KILOHERTZ 



SOUND veiociTy |(i/i«. 



iSQO 4BS0 atOO a950 



AUTOBUOT Dive #2 



.J 



,1 ///V\ 

 1/1/ 



f* i"-?^ 



SPECTRUM lEVEl ( dB/ l/iPo) ( BEDUCED FROM 1/3 OCTAVE ANALYSIS) 



FIGURE 13- NORLANT '72 



AMBIENT NOISE DEPTH 

 DEPENDENCE 



AUTOBUOV DIVE # 1 



•60 '70 »80 tSS 



SPECTRUM LEVEL ( dB* Im Po I ( REDUCED FROM 1/3 OCTAVE ANALYSIS) 



FIGURE 14 . ^30RLANT ' 72 



AMBIENT NOISE DEPTH 

 DEPENDENCE 



FIGURE 15. NORLANT '72 



AMBIENT NOISE SITES 



829 



