86 



Structure 



RECORDING 

 BOAT 



S4A 



Sa S9 



— — o - o - 



S,o ^J' 



STRAIN 

 BOAT 



i SHOT SHOOTING 



POINT BOAT 



5 \ 



\ 



\ 



\ 



\ INSPECTORS BOAT 



OF FISH a GAME 



S^^ 



s, 6 



^VN. DEPT. OF 



\s\S STATE L 



ANDS COMMISSION 



POWDER 

 BOAT 



STRAIN 

 BOAT 



S, S2 S3 S4 



WATER 



BED B 



BED B 



IGI 



Figure 73. Top, typical geophone cable layout in an "L" spread designed to obtain data for computation of true dip 

 and strike components. Bottom, ray paths followed by sound from shot point to reflecting horizons to geophones. 

 Courtesy International Geophysics, Inc. 



