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2022 Vol. 42, No. 4
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Article navigation > Sedimentary Geology and Tethyan Geology > 2022 > 42(4): 666-674
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BAI Yongjian, TIE Yongbo, MENG Mingjie, XIONG Xiaohui, GAO Yanchao, GE Hua, Ba Renji, XU Wei. 2022. Characteristics and temporal-spatial distribution of geohazards in western Sichuan. Sedimentary Geology and Tethyan Geology, 42(4): 666-674. doi: 10.19826/j.cnki.1009-3850.2022.11003
Citation: BAI Yongjian, TIE Yongbo, MENG Mingjie, XIONG Xiaohui, GAO Yanchao, GE Hua, Ba Renji, XU Wei. 2022. Characteristics and temporal-spatial distribution of geohazards in western Sichuan. Sedimentary Geology and Tethyan Geology, 42(4): 666-674. doi: 10.19826/j.cnki.1009-3850.2022.11003
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Characteristics and temporal-spatial distribution of geohazards in western Sichuan

  • 1. Chengdu Center, China Geological Survey, Chengdu 610081, China;

  • 2. Technology Innovation Center for Risk Prevention and Mitigation of Geohazard, Ministry of Natural Resources, Chengdu 611734, China;

  • 3. Observation and Research Station of Chengdu Geological Hazards, Ministry of Natural Resources, Chengdu 610000, China;

  • 4. Sichuan Institute of Land and Space Ecological Restoration and Geological Hazard Prevention, Chengdu 610081, China

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  • Corresponding author: TIE Yongbo  
Received Date:  09 October 2021
Revised Date:  22 April 2022
    Abstract
  • Affected by the uplifting of the Qinghai-Xizang Plateau and the deep cutting of rivers in the Qinghai-Xizang Plateau, a total of 16,411 geohazards, mainly landslides and debris flows, have developed in the western Sichuan, which is an area with high risk of geohazards in China. By means of data collection, mathematical statistics and ArcGIS software analysis, we find that the geohazards are characterized by complex formation mechanism, sudden-group-chain occurrence, and great harm in Western Sichuan. The formation modes of geological disasters are different. The main deformation modes of landslides are slip-crack-shear, retaining wall-break, along the bedding creep-shear, toppling fracture of antidumping rock, etc. The formation mechanism of debris flow are mainly soil - hydraulic drive type and blocking collapse type. Collapse instability mainly includes sliding, toppling and falling. The spatial distribution are mainly controlled by landform and active faults, which are of the distribution of a zone in the low and middle mountains, and a certain band along the active fault zone and deep river valley. Affected by earthquakes and heavy rainfall, geological disasters vary greatly from year to year. Geological disasters occurred frequently and frequently in 2008, 2009, 2013 and 2017.
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