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Potential seismic landslide hazard and engineering effect in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor, China

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China Geology 2023年第2期6卷 228-240页

作者： Zhi-hua Yang Chang-bao Guo Rui-an Wu Wei-wei Shao Peng-fei Yu Cai-hong Li Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Key Laboratory of Active Tectonics and Geological Safety Ministry of Natural ResourcesBeijing 100081China State Key Laboratory of Resources and Environmental Information System Beijing 100101China China University of Geosciences Wuhan 430074China China University of Geosciences(Beijing) Beijing 100083China

The Sichuan-Tibet transportation corridor is located at the eastern margin of the Qinghai-Tibet Plateau,where the complex topography and geological conditions,developed geo-hazards have severely restricted the planning and construction of major projects.For the long-term prevention and early control of regional seismic landslides,based on analyzing seismic landslide characteristics,the Newmark model was used to carry out the potential seismic landslide hazard assessment with a 50-year beyond probability 10%.The results show that the high seismic landslide hazard is mainly distributed along large active tectonic belts and deep-cut river canyons,and are significantly affected by the active tectonics.The low seismic landslide hazard is mainly distributed in the flat terrain such as the Quaternary basins,broad river valleys,and plateau planation planes.The major east-west linear projects mainly pass through five areas with high seismic landslide hazard:Luding-Kangding section,Yajiang-Xinlong(Yalong river)section,Batang-Baiyu(Jinsha river)section,Basu(Nujiang river)section,and Bomi-Linzhi(eastern Himalaya syntaxis)section.The seismic action of the Bomi-Linzhi section can also induce high-risk geo-hazard chains such as the high-level glacial lake breaks and glacial debris flows.The early prevention of seismic landslides should be strengthened in the areas with high seismic landslide hazard.

关键词： Qinghai-Tibet Plateau Sichuan-Tibet transportation corridor seismic landslide Hazard assessment Engineering effect

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Estimation of seismic landslide Hazard in the Eastern Himalayan Syntaxis Region of Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2017年第2期91卷 658-668页

作者： DU Guoliang ZHANG Yongshuang YANG Zhihua Javed IQBAL TONG Bin GUO Changbao YAO Xin WU Ruian Institute of Geomechanics Chinese Academy of Geological SciencesKey Laboratory of Neotectonic Movement and GeohazardBeijing 100081China China Institute of Geo-Environment Monitoring Beijing 100081China Department of Earth Sciences Abbottabad University of Science and TechnologyAbbottabad 22010Pakistan

The eastern Himalayan syntaxis is one of the most tectonically active and earthquake-prone regions on Earth where earthquake-induced geological disasters occur frequently and caused great damages. With the planning and construction of Sichuan-Tibet highway, Sichuan-Tibet railway and hydropower development on the Yarlung Zangbo River etc. in recent years, it is very important to evaluate the seismic landslide hazard of this region. In this paper, a seismic landslide hazard map is produced based on seismic geological background analysis and field investigation using Newmark method with 10% PGA exceedance probabilities in future 50 years by considering the influence of river erosion, active faults and seismic amplification for the first time. The results show that the areas prone to seismic landslides are distributed on steep slopes along the drainages and the glacier horns as well as ridges on the mountains. The seismic landslide hazard map produced in this study not only predicts the most prone seismic landslide areas in the future 50 years but also provides a reference for mitigation strategies to reduce the exposure of the new building and planning projects to seismic landslides.

关键词： probabilistic seismic hazard Newmark method seismic landslide the eastern Himalayan syntaxis Tibet Proto-Tethys

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