Dip and offset together

The response of two points

Another simple geometry is a reflecting point within the earth. A wave incident on the point from any direction reflects waves in all directions. This geometry is particularly important because any model is a superposition of such point scatterers. Figure 8.8 shows an example.

twopoint
Figure 8. Response of two point scatterers. Note the flat spots.

The curves in Figure 8.8 include flat spots for the same reasons that some of the curves in Figures 8.6 and 8.7 were straight lines.

shell
Figure 9. Undocumented data from a recruitment brochure. This data may be assumed to be of textbook quality. The speed of sound in water is about 1500 m/sec. Identify the events at A, B, and C. Is this a common-shotpoint gather or a common-midpoint gather? (Shell Oil Company)

Dip and offset together