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Discussion papers
https://doi.org/10.5194/nhess-2019-25
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2019-25
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 20 May 2019

Research article | 20 May 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Failure modes of loose landslide deposits in 2008 Wenchuan earthquake area in China

Jianjun Gan1,2 and Yi Xia Zhang2 Jianjun Gan and Yi Xia Zhang
  • 1National-Local Joint Engineering Laboratory of Water Engineering Safety and Efficient Utilization of Resources in Poyang Lake Watershed. Nanchang Institute of Technology, Nanchang, 330099, Jiangxi, China
  • 2School of Computing, Engineering and Mathematics, Western Sydney University, 2751, NSW, Australia

Abstract. In this study, a geological investigation and statistical analysis of the post-earthquake slope deposit failures in a meizoseismal area were presented, with a selected example from the 2008 Ms 8.0 Wenchuan earthquake occurred in Sichuan Province in China. The typical slope deposit failures were surveyed in three meizoseismal areas, namely Qingchuan county in Guangyuan city, Beichuan county in Mianyang city, and the epicenter area, Wenchuan county in Aba Tibetan Autonomous Prefecture. According to the movement, material and deformation mechanism of rock or soil, the failures of the post-earthquake landslide deposit could be subdivided into four categories, i.e. slide, collapse, erosion and flow. This classification of failures of landslide deposit considers the topographic and failure after the earthquake. Besides, some other important factors such as topography, lithology and hydrogeology are also considered. The above mentioned four failure categories are further split into 12 sub-classification. The complicated deformation mechanism and different failure patterns of the slope deposits are analyzed in typical deposits. This classification provides a good reference for the prediction of geological hazards, whereas mitigation of the landslide or debris flows caused by loose deposits in the meizoseismal area is still a difficult task.

Jianjun Gan and Yi Xia Zhang
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Status: open (until 17 Jul 2019)
Status: open (until 17 Jul 2019)
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Jianjun Gan and Yi Xia Zhang
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Latest update: 16 Jun 2019
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Short summary
This paper summarizes and classifies the accumulated landslide of Wenchuan earthquake disaster, and puts forward a classification method that takes into account the topography, movement speed, and material, which is helpful to the prevention and control of similar geological disasters in strong earthquake areas.
This paper summarizes and classifies the accumulated landslide of Wenchuan earthquake disaster,...
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