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Predicting landslide scenes under potential earthquake scenarios in the Xianshuihe fault zone, Southwest China

Journal of Mountain Science 2017年第7期14卷 1262-1278页

作者： ZHANG Yong-shuang YANG Zhi-hua GUO Chang-bao WANG Tao WANG Dong-hui DU Guo-liang China Institute of Geo-Environment Monitoring Institute of Geomechanics Chinese Academy of Geological Sciences Chengdu Center China Geological Survey

earthquake-induced landslides can seriously aggravate the earthquake's destructive consequences and have caused widespread concern in recent decades. The Xianshuihe fault is a large active left-lateral strike-slip fault in the southeast margin of Qinghai-Tibet Plateau, Southwest China, where the frequent strong earthquakes have brought abundant geo-hazards. This study focuses mainly on exploring and predicting the landslide scenes induced by the potential earthquakes. Firstly, the sophisticated Newmark model is improved through landslide cases induced by the Ms7.9 Luhuo earthquake in 1973 to adapt the field seismotectonics of the Xianshuihe fault zone. Then, it is used to predict the landslide scenes under one speculated potential earthquake scenario with the similar focal mechanism with the Luhuo earthquake. The preliminary results show that the slope displacement resulted from Newmark model can reflect spatial distribution characteristics ofearthquake-induced landslides. The predicted potential earthquake-induced landslide scenes present an obvious extending trend along the Xianshuihe fault. The landslide hazard is greater in the northeast regions than southwest regions of the Xianshuihe fault, where there are more complex topographic conditions. The study procedure will be a helpful demonstration for exploration and prediction of landslide scenes under potential earthquakes in the regions with high seismic activity.

关键词： Qinghai-Tibet Plateau Xianshuihe fault potential earthquake Landslide Newmark model

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