SECT. 1] 



THE MAGNETIC FIELD OVER THE OCEANS 



197 



US- 



Fig. 12b. Index map to Fig. lib. The shaded areas are positive and the contour interval 

 is 500 y. (After Raff and Mason, 1961, fig. 1.) 



1962). Fig. 13 shows profiles from both sides of both faults; these have been 

 displaced relative to one another to give what is judged to be the best overah 

 match. They are interpreted as indicating a left-lateral slip of about 265 km 

 across the Pioneer Fault and about 1185 km across the Mendocino, making an 

 overall left-lateral displacement of about 1450 km. The quality of the match 



