1090 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1957 



highest water of the river and of the strongest trade winds — conditions 

 favorable for the triggering of turbidity currents. A chart of the area 

 showing the cable breakage on the steep continental slope is shown in 

 Fig. 27. 



Fig. 28 shows areas of the world inaccessible to shallow-water-derived 

 turbidity currents, because of their elevation or because of protective f 



EXPLANATION 



• • • 



PISTON CORE STATIONS 

 ATLANTIS CRUISE A 1 80 



SUBMARINE TELEGRAPH 

 CABLES 



Al/^/^. 



;(\\: 



/ 



AREA OF SLIDES AND 

 SLUMPS NEAR EPICENTER 



AREA TRAVELLED BY 

 DESTRUCTIVE TURBIDITY 

 CURRENT. CABLES BROKEN 

 AND REMOVED 



MARGINAL AREA OF 

 WEAKER CURRENT. CABLES 

 BURIED BUT NOT BROKEN 



+ + + 

 too FATHOM CONTOUR 



ABYSSAL PLAIN 



X<X>vW<.%\ 



HILLS AND MOUNTAINS. 

 BERMUDA RISE, WESTERN 

 FOOTHILLS OF THE 

 MID-ATLANTIC RIDGE 



Fig. 26 — The 1929 Grand Banks turbidity current. 



