[[:file:seismic-migration_fig2.png|Figure 2]] shows another depth section and associated seismic section for a subsurface consisting of a single dipping reflector. For a constant-velocity subsurface, the many weak diffractions from very closely spaced points along the reflector (of which five are shown in the figure) give rise, through constructive and destructive interference, to a net ''reflection'' along the straight-line envelope of the diffraction curves. Note that the reflection is displaced laterally from the true reflector position (the line connecting apexes of the diffraction curves). It is this [[lateral]] mispositioning of reflections from dipping reflectors that gave rise to the term ''migration'' for the process that corrects the positioning. | [[:file:seismic-migration_fig2.png|Figure 2]] shows another depth section and associated seismic section for a subsurface consisting of a single dipping reflector. For a constant-velocity subsurface, the many weak diffractions from very closely spaced points along the reflector (of which five are shown in the figure) give rise, through constructive and destructive interference, to a net ''reflection'' along the straight-line envelope of the diffraction curves. Note that the reflection is displaced laterally from the true reflector position (the line connecting apexes of the diffraction curves). It is this [[lateral]] mispositioning of reflections from dipping reflectors that gave rise to the term ''migration'' for the process that corrects the positioning. |