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17.1 VELMOD Program

The velmod program generates a velocity data file for the seismic and revtime programs. A sinusoidal structure is placed over a flat layer. The primary feature of this artificial model is the varying dip structure as shown in Figure 19. The velocities of this model have maximum to minimum ratio of 3. A portion of the velmod.f program listing is shown in PROGRAM CODE I. The number of cycles in the model is set by the variable Cycle.

PROGRAM CODE I, a portion of velmod.f --- View code

Figure 19: Sine Wave Model.