A type of refraction seismic shooting used to determine the structure across
the strike. The broadside lines are ordinarily laid out in conjunction with the
standard-type profiles that run along the strike. The shot points and detector
spreads are laid out along parallel lines, which are generally across the
strike. The distance between each line of shots and the receiving line is
chosen so that it will always be greater than the double offset distance for
the refractor being followed. Generally the distance should be only slightly
greater so that the primary refracted event will be received as a second
arrival. When this spacing is used, the refracting point associated with the
shot will be very close to that associated with the detector, and each delay
time will be approx. half the intercept time. A single depth point (based on
half the intercept time) is then plotted midway between shot and receiver. All
depth points are thus placed along the "control lines" that are located halfway
between the shooting line and the receiving line. Dobrin
Source:
Dictionary of Mining, Mineral, and Related Terms
