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Estimation of Seismic Landslide Hazard in the Eastern Himalayan Syntaxis Region of Tibetan Plateau |
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| Authors: | DU Guoliang ZHANG Yongshuang YANG Zhihu Javed IQBAL TONG Bin GUO Changbao YAO Xin and WU Ruian |
| Institution: | 1 Institute of Geomechanics, Chinese Academy of Geological Sciences, Key Laboratory of Neotectonic Movement and Geohazard, Beijing 100081, China,2 China Institute of Geo-Environment Monitoring, Beijing 100081, China,1 Institute of Geomechanics, Chinese Academy of Geological Sciences, Key Laboratory of Neotectonic Movement and Geohazard, Beijing 100081, China,3 Department of Earth Sciences, Abbottabad University of Science and Technology, Abbottabad 22010, Pakistan,2 China Institute of Geo-Environment Monitoring, Beijing 100081, China,1 Institute of Geomechanics, Chinese Academy of Geological Sciences, Key Laboratory of Neotectonic Movement and Geohazard, Beijing 100081, China,1 Institute of Geomechanics, Chinese Academy of Geological Sciences, Key Laboratory of Neotectonic Movement and Geohazard, Beijing 100081, China and 1 Institute of Geomechanics, Chinese Academy of Geological Sciences, Key Laboratory of Neotectonic Movement and Geohazard, Beijing 100081, China |
| Abstract: | 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. |
| Keywords: | probabilistic seismic hazard Newmark method seismic landslide the eastern Himalayan syntaxis Tibet Proto-Tethys |
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