SEISMIC METHODS 



77\ 



Fig. 466. — Multiple-event refraction seismogram 

 from Crockett County, Texas, recording distance 

 30,250 - 33,000 feet. (Courtesy of Seismograph Ser- 

 vice Corporation.) 



Fig. 467. — Multiple-event refraction seismogram 

 from West Texas, recording distance 44,000 - 46,250 

 feet. (Courtesy of Seismograph Service Corpora- 

 tion.) 



