748 



HEEZEN 



[chap. 27 



pointed out, could not be attributed to turbidity currents. However, subsequent 

 exploration confirmed Heezen and Ewing's belief that the alleged mountain 

 range was the result of poor contouring of bad soundings. In fact, a siu'vey by 

 Heezen, Ewing and Ericson (1954) revealed nothing but a smooth abyssal 

 plain in the indicated position of Kullenberg's mountains. 



Submarine Cables 

 — Undisturbed Cable 



Replaced Coble 



o Cable Splice 

 • Electrical Deternninatlon 

 of Break 



I 2 3 



® Epicenter 9 September, 1954 



! O; Isoseismals (Roth$,l955) 



Mercalli -Sieberg Scale 



,///..■■'' Balearic Abyssal Plain 

 ^ Suggested Path of Main 

 / Turbidity Current 



Fig. 7. Map showing locations of Orleansville earthquake, path of main turbidity current 

 and submarine cables. Depths in fathoms. Note that the northernmost cables were 

 not interrupted by the turbidity current. It is probable that several coalescing 

 turbidity currents joined to produce the pattern of breaks indicated on this map. 

 (After Heezen and Ewing, 1955.) 



B. Orleansville Turbidity Currents 



A series of cable failures on the floor of the western Mediterranean (Figs. 6, 

 7 and 8), essentially similar in distribution and order to the Grand Banks 

 sequence, followed the 1954 Orleansville earthquake (Heezen and Ewing, 1955). 

 These events further support the interpretation of the Grand Banks turbidity 



