500 



SEISMIC METHODS 



[Chap. 9 



moo 20pOO Feef 



Fig. 9-37. Fan times plotted on preliminary travel-time curve (after Barton). 



4500 ft. salt 

 conteur 



MOftS BLUFF DOMK 



Fig. 9-38. Refraction fans and travel-time anomalies ("accelerations") at Moss Bluflf 

 salt dome (after Eby and Clark). 



stations are then compared with the corresponding times of the standard 

 curve for the same distance. Fig. 9-37 shows such fan times plotted on 



