Article (Scientific journals)
Topographic and near-surface stratigraphic amplification of the seismic response of a mountain slope revealed by field monitoring and numerical simulations
Luo, Y.; Fan, X.; Huang, R. et al.
2020In Engineering Geology, 271
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Keywords :
Seismic amplification; Seismic monitoring; Standard spectral ratio (SSR); Wenchuan aftershock; Earthquake effects; Earthquake engineering; Hazards; Induced Seismicity; Monitoring; Numerical models; Professional aspects; Seismic waves; Stratigraphy; Topography; Amplification effects; Amplification factors; Geological structures; Spectral ratios; Amplification; China; Sichuan
Abstract :
[en] The evaluation of seismic site amplification and its relationship with geological structures play a vital role in earthquake engineering and hazard assessment. This study presents an analysis of topographic and geologic site amplification effects observed in the Qiaozhuang region, Sichuan Province, China. Seismic recordings at several monitoring stations installed on two slopes located at a distance of about 1 km in the study area after the 2008 Wenchuan earthquake provide evidence of strong and variable amplifications. To assess the combined effect of topographic and geological controls in slope response to seismic motions, we built 2D and 3D dynamic numerical models using monitoring data as inputs. Four layers with different P-wave velocities, based on geophysical survey in the study area, are considered in the numerical models. Models that only consider topography give an amplification factor of <3, which is much lower than the amplification factor of 5–6 from the monitoring data, while those models that considered both the topographic variation and four layers agree well with the monitoring data. The 3D modeling results show that the subsurface amplification factor is less than that on the slope surface even at the same elevation. This is also consistent with the monitoring data and further indicates that the combined topographic and geological amplification effect on the slope surface is more significant than the sole geological amplification effect inside the slope. Our numerical simulation results suggest that it is important to consider the combined topographic and geological amplification effects in the hazard assessment of seismically induced slope failures. © 2020 Elsevier B.V.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Luo, Y.;  State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection, Chengdu University of Technology, Chengdu, 610059, China, University of Liege, Department of Geology, Georisk and Environment, Belgium
Fan, X.;  State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection, Chengdu University of Technology, Chengdu, 610059, China
Huang, R.;  State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection, Chengdu University of Technology, Chengdu, 610059, China
Wang, Yuan ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes microélectroniques intégrés
Yunus, A. P.;  State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection, Chengdu University of Technology, Chengdu, 610059, China
Havenith, Hans-Balder  ;  Université de Liège - ULiège > Département de géologie > Géologie de l'environnement
Language :
English
Title :
Topographic and near-surface stratigraphic amplification of the seismic response of a mountain slope revealed by field monitoring and numerical simulations
Publication date :
2020
Journal title :
Engineering Geology
ISSN :
0013-7952
Publisher :
Elsevier B.V.
Volume :
271
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
National Basic Research Program of China (973 Program): 2017YFC1501000; SKLGP 2019K02441202211; SKLGP2019Z00241521002
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since 31 July 2020

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