Characteristics of geological hazards and it’s mitigations of the <i>M</i>s6.8 earthquake in Luding County, Sichuan Province

TIE Yongbo; ZHANG Xianzheng; LU Jiayan; LIANG Jingtao; WANG Donghui; MA Zhigang; LI Zongliang; LU Tuo; SHI Shengwei; LIU Minsheng; BA Renji; HE Longjiang; ZHANG Xinke; GAN Wei; CHEN Kai; GAO Yanchao; BAI Yongjian; GONG Lingfeng; ZENG Xiaowen; XU Wei

doi:10.16030/j.cnki.issn.1000-3665.202209023

2022 Vol. 49, No. 6

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TIE Yongbo, ZHANG Xianzheng, LU Jiayan, LIANG Jingtao, WANG Donghui, MA Zhigang, LI Zongliang, LU Tuo, SHI Shengwei, LIU Minsheng, BA Renji, HE Longjiang, ZHANG Xinke, GAN Wei, CHEN Kai, GAO Yanchao, BAI Yongjian, GONG Lingfeng, ZENG Xiaowen, XU Wei. Characteristics of geological hazards and it’s mitigations of the Ms6.8 earthquake in Luding County, Sichuan Province[J]. Hydrogeology & Engineering Geology, 2022, 49(6): 1-12. doi: 10.16030/j.cnki.issn.1000-3665.202209023

Citation:

TIE Yongbo, ZHANG Xianzheng, LU Jiayan, LIANG Jingtao, WANG Donghui, MA Zhigang, LI Zongliang, LU Tuo, SHI Shengwei, LIU Minsheng, BA Renji, HE Longjiang, ZHANG Xinke, GAN Wei, CHEN Kai, GAO Yanchao, BAI Yongjian, GONG Lingfeng, ZENG Xiaowen, XU Wei. Characteristics of geological hazards and it’s mitigations of the Ms6.8 earthquake in Luding County, Sichuan Province[J]. Hydrogeology & Engineering Geology, 2022, 49(6): 1-12. doi: 10.16030/j.cnki.issn.1000-3665.202209023

Characteristics of geological hazards and it’s mitigations of the Ms6.8 earthquake in Luding County, Sichuan Province

1.
Chengdu Center of China Geological Survey, Chengdu, Sichuan　610081, China
2.
School of Engineering and Technology, China University of Geosciences (Beijing), Beijing　100083, China
3.
Sichuan Geological Survey, Chengdu, Sichuan　610084, China
4.
Research Institute of Spatial Ecological Restoration and Geological Disaster Prevention of Sichuan Province, Chengdu, Sichuan　610084, China
5.
Institute of Exploration Technology , CAGS, Chengdu, Sichuan　610031, China
6.
Application Geological Research Center, Chengdu, Sichuan　610036, China

Received Date: 13 September 2022

Revised Date: 15 September 2022

Publish Date: 15 November 2022

Abstract

Abstract

On September 5^th, 2022, the Ms 6.8 earthquake in Luding County, Sichuan Province induced large numbers of geological hazards. In order to deeply understand the evolution, distribution, and characteristics of geological hazards caused by the earthquake, we obtained the distribution of geological hazards by the field investigation and remote sensing interpretation. The conditions for hazard control and the countermeasures for hazard prevention and reduction are also analyzed. The results show that as of 22:00 on September 14, 2022, the earthquake has induced 565 geological hazards with threat objects in Luding County and Shimian County (including 331 collapses and 234 landslides), and 81 existing geological hazards whose deformation increased. The geological hazards induced by the earthquake are mainly medium and small mass high-level collapses, which are mainly concentrated in the areas with Seismic intensity zone of Ⅸ near the epicenter. These areas include Moxi Town, Detuo Township, both banks of Dadu River between Detuo Township and Dewei town in Luding County, Caoke Township and Wanggangping Township in Shimian County. According to the experience of the Wenchuan earthquake, the debris flow will be active in the next five years, and its characteristics of high frequency and viscous debris flow should be considered in the design of debris flow prevention and control engineering. Under the rainfall condition, the landslide deposition remaining on the slopes of Dadu River banks in the section of Detuo Township—Dewei Town can easily transform into debris flow. The transformation forms of the two hazards’ types should be fully considered in the design of prevention and control projects. The study can provide a reference for earthquake geological hazard prevention and post hazard reconstruction planning in the earthquake area.
- Ms 6.8 earthquake in Luding County /
- co-seismic geological hazards /
- hazard control conditions /
- evolution trend /
- hazard mitigation countermeasures

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References

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