Long-term activity of earthquake-induced landslides: A case study from Qionghai Lake Basin,Southwest of China |
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Authors: | Xue-li Wei Ning-sheng Chen Qian-gong Cheng Na He Ming-feng Deng Javed Iqbal Tanoli |
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Affiliation: | 1. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 610031, China 2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China
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Abstract: | Earthquake-triggered landslides are a major geological hazard in the eastern Tibetan Plateau, and have prolonged impact on earth surface processes and fluvial system. To determine how long co-seismic landslides affect basins, a massive number of landslides existing in Qionghai Lake Basin were investigated for landslide distribution characteristics and geomorphological evidences, with further comparison and analysis using historic seismic analog method. The landslides found in Qionghai Lake Basin showed clear features of seismic triggering with strongly controlled by Zemuhe fault. These landslides are still active at present. Some new slides generally occur in ancient slope failure zones causing serious secondary hazards in recent years. In this study we strengthen the idea that the landslides triggered by the 1850 Xichang earthquake (MS7.5) have long term activity and prolonged impact on the mountain disasters with a period of more than 160 years. Our results support growing evidence that co-seismic landslides have a prolonged effect on secondary disasters in a basin, and invite more careful consideration of the relationship between current basin condition and landslide history for a longer period. |
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Keywords: | Qionghai Lake Earthquake Landslide Debris flow Sediment yield |
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