RODERICK: FORWARD SCATTERED LOW-FREQUENCY SOUND FROM THE SEA SURFACE 



-12 



CD 



-o 



FREQUENCY 

 600 Hz 



-24 



361 — I — ^ L 



FREQUENCY 

 850 Hz 



-12 



CO 



-24 



J I I I I -36' — I 1 — ' — ' ' — ' — I L. 



-.4 -.3 -.2 -.1 .1 .2 .3 4 -.4 -.3 -2 -.1 .1 .2 .3 .4 



Hz Hz 



-12 



CO 



-o 



-24 



FREQUENCY 

 1300 Hz 



-36' 1 1 1 ' 1 1 1 1 1 -36l I L 



-12- 



co 



-24 



FREQUENCY 

 1800 Hz 



J I L 



-.4 -.3 -.2 -.1 .1 .2 .3 .4 -.4 -.3 -.2 -.1 .1 .2 .3 .4 



Hz Hz 



Figure 13. DOPPLER SPECTRA AT SELECTED FREQUENCIES 

 (from O'Brien, Pearson and Freese, 1974) 



348 



