## 4 Results and Discussion
### Verification and Discussion of Results
#### 4.2.1 Landslide  
Landslide No. 9 is located on the west side of Gaojiamao, Fengyuan Town, Chengcheng County, Weinan City, Shaanxi Province. As shown in Figure 5, the landslide exhibits a tongue-shaped plane with crisscrossing gullies in the area. A highway can be seen on the upper part of the slope, and the dynamic load of vehicles affects the stability of the loess soil at the top of the slope. The front edge is adjacent to the Luo River with a steep slope. The landslide exhibits a high deformation rate, with data incoherence observed in some regions. Field investigations revealed that the deformation zone partially overlaps with the goaf area of the Anli coal mine. The overall deformation rate of the landslide ranges from \(-35.8\) mm/y to \(1.44\) mm/y, with a general downward deformation trend. Proposed transmission towers \(5529060\) and \(5529061\) would be located on the mid-to-lower section of the landslide body, above the second-level platform. From the deformation rate map, it can be observed that the deformation rates at \(5529060\) and \(5529061\) are higher than those of the surrounding deformation points. Below \(5529060\), near the Luohe River and its outlet, a significant deformation point loss is visible. This phenomenon continues down to \(5529061\). In addition to the influence of the steep slope and satellite orbit direction, it is speculated that the major deformation is primarily caused by river erosion of the slope. Landslide No. 9 exhibits severe deformation and damage, as shown in Figure 6a, primarily concentrated near the two transmission towers. The deformation is mainly distributed in the middle-lower section and the front edge of the landslide and is characterized by the development of small-scale collapses, cracks, and sinkholes. Three faults and three rock collapses have developed at the front edge. The faults occur within interbedded plate-shaped sandstone and mudstone above Tertiary sandstone, with displacement distances of less than \(5\) m. The dip directions range from \(4^{\circ}\) to \(13^{\circ}\), and the dip angles are between \(66^{\circ}\) and \(75^{\circ}\), as shown in Figure 6b. The rock mass at the location of the fault is poorly  
Figure 5: InSAR deformation overview of potential landslide No. 9.  
stabilized, often leading to rock collapses or gullies. The collapsed material primarily consists of gravel, sandstone, and mudstone. Taking the C2 collapse as an example, the rock masses on both sides of this small-scale collapse are discontinuous with sharp edges, and the exposed bedrock outcrop appears fresh. Field investigations determined that this collapse occurred recently, triggered by the deformation of weak layers, which caused the rock mass to destabilize and collapse, forming a small accumulation body, as shown in Figure 6c. A total of 22 cracks are predominantly concentrated around the site for transmission tower 5S29061 and distributed in a belt-like pattern. Cracks are visible on the walls of residential buildings in Gaoijamao, located to the east of the site for transmission tower 5S29061. One crack penetrates through a house, as shown in Figure 6d, with a width of approximately 3 cm. The trend is the same direction as the slope, with a nearly vertical inclination. In addition, cracks can be seen at multiple locations on the slope surface, as shown in Figure 6e,f, with lengths of over 5 m and a maximum length of 35 m. The width ranges from 10 to 65 cm and is mainly arranged in parallel. Some cracks penetrate the slope, forming seepage channels that cut through the slope body, resulting in subsidence and collapse of the surface soil and rock mass as well as the retreat of the terrace edge. Sinkholes were observed around the cracks, widely distributed across the slope surface, as shown in Figure 6g,h.