<p>The study area is located in the eastern edge of the southern Tibet Autonomous Region, which is affected by the collision effect between the Indian and Eurasian plates, and is a typical plateau deep-cut area with longitudinal gullies and valleys, complicated geological conditions and frequent geological disasters. With the increasing population and intensified human engineering-economic activities in the deeply incised terrain of the Tibetan Plateau, there is an urgent need to conduct geophysical investigations and evaluations of geohazards in critical zones to reduce potential disaster risk. This initiative is vital for disaster prevention and supports regional research on geohazard evolution. To address the extreme topographic relief characteristic of the Tibetan Plateau’s deeply incised terrain, a combined active-source and passive-source surface wave survey I was implemented. By integrating dispersion spectra from both datasets and extracting dispersion curves, two-dimensional shear-wave velocity (Vs) profiles and three-dimensional stratigraphic structures were established for the study area. The results demonstrate that combining high-frequency active-source surface waves with low-frequency passive-source data achieves complementary advantages, broadening the effective frequency band while enhancing resolution and accuracy. The delineation of landslide stratification, weathering layer interfaces, and thickness aligns well with actual borehole data. This methodology demonstrates operational feasibility with 92% borehole validation accuracy for landslide investigations in deeply incised plateau regions, offering substantial practical significance and applied value for advancing disaster prevention and mitigation efforts.</p>