Active Tectonic Deformation of Dangjiang Fault at the Western End of the Southern Boundary Zone of Bayan Har Block: Interpretation and Field Verification by High-resolution Remote Sensing

Based on the systematic summary of the active fault remote sensing interpretation signs, using the Aowei Map and 91 Weitu maps, combined with the previous research findings, this study focuses on the spatial distribution and geometric and kinematic characteristics of the Ganzi-Yushu fault belt in the Dangjiang section. On this basis, we conduct field surveys for the key sections to verify the interpretation results through a series of faulted geomorphic phenomena. Finally, the geometric distribution of the Ganzi-Yushu fault belt in the Dangjiang section is obtained. The research results show that: 1）the overall trend of the Ganzi-Yushu fault belt in the Dangjiang section is NWW; 2）the fault geomorphic features developed include fault scarps, gullies, ravines, and left-lateral displacement of river terraces; 3）the fault movement nature is predominantly left-lateral strike-slip with a vertical dip component. The study also shows that: 1） remote sensing interpretation is very important for working in high-altitude, high-cold, and areas with poor transportation; 2）remote sensing interpretation is more intuitive and easier to use in areas with less surface damage and less vegetation coverage; 3）the remote sensing image features of active tectonic deformation areas are obvious, making it easier to conduct remote sensing interpretation.