**4. Basic Characteristics of Landslides and Hazard Zoning**

The landslide had a long-strip shape (Figure 4a). The slope before the landslide was close to 40◦, and the main slip direction was N 69◦ E. The elevation of the trailing edge of the landslide was about 1280 m, the elevation of the landslide shearing edge was about 1190 m, and the horizontal distance reached 375 m (Figure 4b). Due to rainfall and snow infiltration, pore water pressure and soil saturation increased during the sliding process. The landslide was transformed into debris flow, showing a flow state. Based on the information obtained from the unmanned aerial vehicle data and remote sensing, geological field surveys, the landslide can be divided into the sliding source area, debris flow area, and accumulation area (Figure 5).

**Figure 4.** (**a**) Overview of the Panjinbulake landslide. (**b**) The engineering geological section.

**Figure 5.** Three-dimensional Digital Elevation Model diagram of the landslide and typical pictures.
