*3.3. Tracking Results*

The velocity spectrum images of all 100 CDP points are sequentially tracked. The tracking results of CDP 50 to CDP 55 are shown in Figure 9. The red rectangle is the tracking target, and the yellow rectangle is the velocity spectrum tracking results of different CDPs. The tracking path is formed by connecting the midpoint positions of the tracking results. As shown in Figure 10, the four color lines are the paths of the energy clusters to track laterally. It can be found by comparing Figure 4 that the four tracking paths are consistent with the four interfaces in the model. By extrapolating seismic parameters along the tracking path, the initial model conforming to the underground structure can be obtained.

**Figure 9.** The tracking results of CDP 50 to CDP 55.

**Figure 10.** Result of tracking paths.
