Chap. 9] 



SEISMIC METHODS 



473 



Table 53 — Concluded 

 ELASTIC VELOCITIES OF TRANSVERSE WAVES 



Table 54 

 RAYLEIGH WAVE VELOCITIES 



" From vibrator measurements. 



Table 55 

 VERTICAL VELOCITIES OF LONGITUDINAL WAVES^^" 



Formation 



Pleistocene to Oligocene 



Eocene 



Cretaceous 



Permian 



Pennsylvanian 



Mississippian 



Devonian 



Ordovician 



Velocities (ft-8ec.~i) in 

 Shales and Sandstones 



0-2000 ft. 



6,500 

 7,100 

 7,400 

 8,500 

 9,500 



13,300 



2000-3000 3000-4000 

 ft. ft. 



7,200 



9,000 



9,300 



10,000 



11,200 



13,400 



8,100 

 10,100 

 10,700 



11,700 



13,500 



Velocities (ft- sec."') 

 IN Limestones 



At Surface 



11,000 



15,000 

 12,500 

 14,000 

 16,700 



At Depth (Mean 

 Depth of Section) 



13,500 

 15,500 

 15,500 

 17,000 

 17,500 

 20,000 



(3,300) 

 (3,900) 

 (3,000) 

 (4,700) 

 (4,500) 

 (4,000) 



'*' Data from fifty wells in Mississippi, Louisiana, Texas, New Mexico, Oklahoma, Kansas, Colorado, and 

 Pennsylvania, from B. Weatherby and L. Y. Faust. 



