Angle-gather time migration

Dipping reflectors model

This model contains fewer dips than the dome model but it allows us to see what is happening at later times. Figure 8 shows the common offset sections and stacked section from offset-domain Kirchhoff migration. Once again, they are practically perfect. The only problem is near the bottom of the section where we lose energy because the data was truncated.

The zero-angle and large-angle sections from the angle-domain migration are in Figure 9, along with the stacked section. Once again, the zero angle section is very weak and the large angle section only contains information down to a time of $\approx .85$ seconds, for the same reason as explained for the dome model.

Once again, we expect the stacked sections in Figures 8 and 9 to be the same. Although the angle-domain stack is slightly lower amplitude throughout the section, it is clear that this is a simple scale factor so our expectations remain intact.

offset-lines
Figure 8. Left: Migrated offset section at zero offset. Center: Migrated offset section at far offset. Right: Stack.

angle-lines
Figure 9. Left: Migrated angle section at zero angle. Center: Migrated angle section at large angle. Right: Stack.

Angle-gather time migration