Article (Scientific journals)
Traditional and modified Newmark displacement methods after the 2022 Ms 6.8 Luding earthquake (Eastern Tibetan Plateau)
Djukem, Danny Love Wamba; Fan, Xuanmei; Braun, Anika et al.
2024In Landslides
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Keywords :
Co-seismic landslides; Earthquake intensity; Focal mechanism effect; Site effects; Slope aspect; Topographic amplification; Co-seismic landslide; Displacement method; Focal mechanism; Newmark; Seismic landslides; Geotechnical Engineering and Engineering Geology
Abstract :
[en] The Newmark displacement (ND) method, which reproduces the interactions between waves, solids, and fluids during an earthquake, has experienced numerous modifications. We compare the performances of a traditional and a modified version of the ND method through the analysis of co-seismic landslides triggered by the 2022 Ms 6.8 Luding earthquake (Sichuan, China). We implemented 23 ND scenarios with each equation, assuming different landslide depths, as well as various soil-rock geomechanical properties derived from previous studies in regions of similar lithology. These scenarios allowed verifying the presence or absence of such landslides and predict the likely occurrence locations. We evaluated the topographic and slope aspect amplification effects on both equations. The oldest equation has a better landslide predictive ability, as it considers both slope stability and earthquake intensity. Contrarily, the newer version of the ND method has a greater emphasis on slope stability compared to the earthquake intensity and hence tends to give high ND values only when the critical acceleration is weak. The topographic amplification does not improve the predictive capacity of these equations, most likely because few or no massive landslides were triggered from mountain peaks. This approach allows structural, focal mechanism, and site effects to be considered when designing ND models, which could help to explain and predict new landslide distribution patterns such as the abundance of landslides on the NE, E, S, and SE-facing slopes observed in the Luding case.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Djukem, Danny Love Wamba;  State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China
Fan, Xuanmei;  State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China
Braun, Anika;  Department of Engineering Geology, Institute of Applied Geosciences, Technische Universität Berlin, Berlin, Germany
Chevalier, Marie-Luce;  Key Laboratory of Continental Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, China
Wang, Xin;  State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China
Dai, Lanxin;  State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China
Fang, Chengyong;  State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China
Zhang, Xinxin;  State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China
Gorum, Tolga;  Istanbul Technical University, Eurasia Institute of Earth Sciences, Istanbul, Turkey
Xu, Qiang;  State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China
Havenith, Hans-Balder  ;  Université de Liège - ULiège > Département de géologie > Géologie de l'environnement
Language :
English
Title :
Traditional and modified Newmark displacement methods after the 2022 Ms 6.8 Luding earthquake (Eastern Tibetan Plateau)
Publication date :
2024
Journal title :
Landslides
ISSN :
1612-510X
eISSN :
1612-5118
Publisher :
Springer Science and Business Media Deutschland GmbH
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
This research is financially supported by the National Science Fund for Distinguished Young Scholars of China (Grant 42125702), the Natural Science Foundation Sichuan Province (Grant 22NSFSC0029), the Tencent Foundation through the XPLORER PRIZE (Grant XPLORER-2022-1012).
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since 30 January 2024

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