GRAVITATIONAL METHODS 



365 



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(a) 



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GRADIENT 



Cb) 



Fig. 214. — (a) Plan view of traverse of torsion balance stations across the 

 Luling Fault, Texas. The surface trace of the fault and its trace on the 

 Edwards Limestone at about 2000 feet depth are shown, (b) Geologic section 

 and gradient profile along survey line. (After Barton.) 



