2026-10-14T04:39:26Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33653100 2026-09-12T06:42:45Z category_4 category_21 category_272 category_39 category_45 category_734 portal_87 item_type_3 month_year_09_2026

Spatial pattern and driving mechanisms of geohazards in the lower yarlung zangbo suture zone: implications for engineering construction in extreme mountainous environments Weiyan Luo (18283825) Junmeng Zhao (24823920) Chongyang Bu (24823923) Kangcheng Zhu (24823926) Yang Pu (5330972) Luqi Wang (94435) Biochemistry Biotechnology Environmental Sciences not elsewhere classified Ecology Sociology Biological Sciences not elsewhere classified Lower yarlung zangbo suture zone geohazard susceptibility high-altitude long-runout hazards PCA-LR hybrid model slope aspect effect <p>The lower Yarlung Zangbo Suture Zone represents an extreme geohazard environment driven by intense tectonic activity and monsoonal hydrology. This study established a database of 492 hazard points (2013–2022) and developed a PCA-LR hybrid model to address multicollinearity and subjectivity in susceptibility assessment. Principal Component Analysis (PCA) was used for dimensionality reduction, followed by Logistic Regression (LR) for sensitivity-based weight refinement.Results reveal significant spatial clustering. Notably, 29.5% of hazards occur on gentle valley slopes (0°–13°), identifying these as accumulation zones for high-altitude long-runout events. Although slope aspect showed low variance in PCA, it demonstrated high sensitivity in the LR model; hazard density on windward slopes is 2.3 times higher than on leeward slopes, highlighting critical microclimatic effects. Furthermore, 83% of hazards cluster within 1,000 m of road networks due to the coupling of unloading fractures and fluvial erosion. The model achieved robust predictive performance (mean AUC = 0.87 ± 0.03 under 5-fold spatial cross-validation). We recommend “avoidance-first” strategies, such as substituting roads with tunnels in highly sensitive segments, to ensure the long-term stability of strategic infrastructure in this extreme mountainous environment.</p> 2026-09-12T06:42:45Z Dataset Dataset 10.6084/m9.figshare.33653100.v1 https://figshare.com/articles/dataset/Spatial_pattern_and_driving_mechanisms_of_geohazards_in_the_lower_yarlung_zangbo_suture_zone_implications_for_engineering_construction_in_extreme_mountainous_environments/33653100 CC BY 4.0