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On the initiation, movement and deposition of a large landslide in Maoxian County, China

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Abstract

At 5 am 24th June 2017, a catastrophic landslide hit Xinmo Village, Maoxian County, Sichuan Province, China. The slide mass rushed down from an altitude of 3400m and traveled 2700 m in a high velocity. The 13 million m3 deposition buried the whole village and caused about 100 deaths. The source area of the landslide is located in a high steep slope, average slope angle is 40º and maximal angle is 65º. The strata are interbedded Triassic Zagunao Formation metamorphic sandstone and slate with the dip slope angle of 45°. Based on high-resolution satellite remote sensing image, UAV image, DEM data, and field investigation, failure mechanism, travel features, and deposit characteristics were analyzed. The results showed that this landslide was influenced by Songpinggou Fault zone. According to the topography before the failure, the landslide is located in the back scarp of an antecedent landslide induced by Diexi Earthquake in 1933. The bedding slope provided potential rupture surface. Historical seismic activities and long-term gravitational deformation caused rock mass accumulated damages. Weathering and precipitation weakened the rock mass and finally induced shearing and tension failure. A huge block detached from the top rock slope, pushed the past landslide deposits in the middle part, rushed out of the slope bottom in a high velocity and buried the Xinmo Village. The rapid movement entrained and brought the soil into the Songping Gully which recoiled with and bounced back from the opposite mountain.

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Acknowledgement

This study was partially supported by the National Science Foundation of China (Grant No. 41572302) and the Funds for Creative Research Groups of China (Grant No. 41521002).

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Authors and Affiliations

  1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, China

    Xiang-jun Pei, Bin Guo, Sheng-hua Cui, Dong-po Wang, Qiang Xu & Tian-tao Li

Authors
  1. Xiang-jun Pei

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  2. Bin Guo

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  3. Sheng-hua Cui

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  4. Dong-po Wang

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  5. Qiang Xu

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  6. Tian-tao Li

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Correspondence toBin Guo.

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Pei, Xj., Guo, B., Cui, Sh.et al. On the initiation, movement and deposition of a large landslide in Maoxian County, China.J. Mt. Sci.15, 1319–1330 (2018). https://doi.org/10.1007/s11629-017-4627-1

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