Changes

Figure 4 shows the application of migration to CMP-stacked field data. The superposition of diffraction curves evident in the unmigrated data of Figure 4a gives rise to crossing reflections that can not plausibly be interpreted as structure. By correcting for lateral mispositioning of dipping reflectors and “collapsing” diffraction curves to zones defined by the diffraction apex, migration converts the recorded waves to a subsurface picture (Figure 4b) depicting both broadly and tightly folded anticlines and synclines.

Figure 4 shows the application of migration to CMP-stacked field data. The superposition of diffraction curves evident in the unmigrated data of Figure 4a gives rise to crossing reflections that can not plausibly be interpreted as structure. By correcting for lateral mispositioning of dipping reflectors and “collapsing” diffraction curves to zones defined by the diffraction apex, migration converts the recorded waves to a subsurface picture (Figure 4b) depicting both broadly and tightly folded anticlines and synclines.

[[file:seismic-migration_fig4.png|thumb|{{figure number|4}}(a) CMP stack of data from the Santa Barbara Channel, offshore California. (b) Result of migration.]]

[[file:seismic-migration_fig4-part1.jpg|thumb|{{figure number|4}}(a) CMP stack of data from the Santa Barbara Channel, offshore California. (b) Result of migration.]]

[[file:seismic-migration_fig4-part2.jpg|thumb]]

==How migration is accomplished==

==How migration is accomplished==