Dynamic Effect of Landslides Triggered by Earthquake: A Case Study in Moxi Town of Luding County, China

IF 4.1 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Journal of Earth Science Pub Date : 2024-02-14 DOI:10.1007/s12583-022-1806-y

Hongfu Zhou, Fei Ye, Wenxi Fu, Bin Liu, Tian Fang, Rui Li

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Abstract

The dynamic effect is a very important issue widely debated by scholars when studying the genetic and disaster-causing mechanisms of earthquake-triggered landslides. First, the dynamic effect mechanism and phenomena of earthquake-triggered landslides were summarized in this paper. Then, the primary types of dynamic effects were further used to interpret the Mogangling landslide in Moxi Town of Luding County, China. A field investigation, remote sensing, numerical calculation and theoretical analysis were carried out to illustrate the failure mechanism of slope rock masses affected by earthquakes. The interaction between seismic waves and slope rock masses and the induced dynamic effect of slope rock masses were primarily accounted for in the analysis. The slope topography, rock mass weathering and unloading characteristics, river erosion, regional seismogenic structure, and rock mass structure characteristics were also discussed. The results showed that the formation of the Mogangling landslide was mainly related to the high amplification effect of seismic acceleration and back slope effects, interface dynamic stress effects, and double-sided slope effects of seismic waves caused by the catastrophic Ms 7.75 Moxi Earthquake in 1786. The principles for the site and route selection of large-scale infrastructure in the planning stage and the scientific prevention of seismic geological disasters were proposed on the basis of the dynamic effect of earthquake-induced landslides.

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地震引发滑坡的动态效应：中国泸定县磨西镇案例研究

动态效应是学者们在研究地震诱发滑坡的成因和致灾机理时广泛讨论的一个非常重要的问题。本文首先总结了地震诱发滑坡的动力效应机理和现象。然后，进一步利用动力效应的主要类型对中国泸定县磨西镇莫岗岭滑坡进行了解读。通过实地调查、遥感、数值计算和理论分析，阐述了受地震影响的边坡岩体的破坏机理。分析主要考虑了地震波与边坡岩体之间的相互作用以及边坡岩体的诱发动力效应。此外，还讨论了边坡地形、岩体风化和卸载特征、河流侵蚀、区域震源结构和岩体结构特征。结果表明，莫干岭滑坡的形成主要与 1786 年莫西 7.75 级特大地震引起的地震加速度高放大效应和背斜效应、界面动应力效应以及地震波的双面坡效应有关。以地震诱发滑坡的动力效应为基础，提出了规划阶段大型基础设施的选址、选线原则和地震地质灾害的科学防治原则。

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来源期刊

Journal of Earth Science 地学-地球科学综合

CiteScore

5.50

自引率

12.10%

发文量

128

审稿时长

4.5 months

期刊介绍： Journal of Earth Science (previously known as Journal of China University of Geosciences), issued bimonthly through China University of Geosciences, covers all branches of geology and related technology in the exploration and utilization of earth resources. Founded in 1990 as the Journal of China University of Geosciences, this publication is expanding its breadth of coverage to an international scope. Coverage includes such topics as geology, petrology, mineralogy, ore deposit geology, tectonics, paleontology, stratigraphy, sedimentology, geochemistry, geophysics and environmental sciences. Articles published in recent issues include Tectonics in the Northwestern West Philippine Basin; Creep Damage Characteristics of Soft Rock under Disturbance Loads; Simplicial Indicator Kriging; Tephra Discovered in High Resolution Peat Sediment and Its Indication to Climatic Event. The journal offers discussion of new theories, methods and discoveries; reports on recent achievements in the geosciences; and timely reviews of selected subjects.