6. Conclusion
The extent of threshold distance of damage zone of the YLTP Fault is estimated as 5.9±0.6 km, which reaches values close to the maximum reported in literatures. Within the threshold distance of YLTP Fault, both fracture spacing and density (joint volumetric count) and rock mass cohesion exhibit a power law relation with distance from the core of the YLZP Fault. Based on this relationship, we conclude that rock mass structure generated by internal dynamic action of faults is the dominant control on rock mass strength within the damage zone. To predict/assess the influence of faults in controlling regional landslide and rockfall distribution, the spatial variation of the geometrical characteristics of jointing is a key issue for future investigations.
Acknowledgments This work was supported by the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA23090402), Application of Synthetic Aperture Radar-Based Geological Hazard Analysis Technology on the Strategic Electricity Transmission Passage of Sichuan-Tibet Plateau (Grant No. 52199918000C), Foundation of China Scholarship Council, and the CARIPLO 2016-0756 @RockHoRiZon - Advanced Tools for Rockfall Hazard and Risk Zonation at the Regional Scale project.