GATE-2018 (24) :Wyllie – Time average equation

 

17)  In a 3D seismic survey  there are 512  groups of receivers in one line of path. Eight groups are moved per line from one patch to next along the swath. What is the inline fold?

(Thanks to Chandrasekhar, ANU)

Solution:  Given that 

 Receiver line length = 512

Shot line spacing= 8

 Inline fold= $=\frac{Receiver line length}{2 \times shot line spacing}$

$=\frac{512}{2 \times 8}$

$=\frac{512}{16}$

$=32$