62 



HKRSKY 



[chap. 4 



6.0 

 SEC 



7.0 



8.0 





34*01.8' N 



irss.o'w 



NAUTICAL MILES 



7.0 



— 8.0 



10 



Fig. 12. A profile over the 

 abyssal plain east of 

 the Strait of Gibraltar. 

 Bottom echo at 5.85 

 sec. Deepest sub- 

 bottom echo about 

 7.15 sec. 



Source: 5000 joule boomer 

 Receiver: AX 58 hydro- 

 phone 

 Towing speed : 3 knots 

 Analysis filter : 75-150 c/s 

 band -pass 



6.5 



7.0- 



34°02'N 

 16°23' W 



.t^f'tm- -• Jr.- -**-*M' ■*• 



f i ii^j i ""« 





ZA 



y«».' " i't<'(W ■ ■ 



5* 



:.^ 



e*? 





!By^. Wnr^ti^jp 



H 







1.0 



15 



NAUTICAL MILES 



5.5 

 6.0 

 65 

 7.0 



34''00'N 

 15M5'W 



Fig. 13. An east-west profile about 100 miles north of Madeira. Bottom echo at 5.0 to 

 5.5 sec. Deepest sub-bottom echo 6.0 to 6.4 sec. 



Source : 5000 joule boomer 

 Receiver : AX 58 hydrophone 

 Towing speed : 3 knots 

 Analysis filter: 75-150 c/s band-pass 



