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Seismic hazard prediction using multispectral amplification maps in a complex topographic area: A case study of Qiaozhuang town, Sichuan Province, Southwest China

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Journal of Mountain Science 2022年第3期19卷 726-739页

作者： LUO Yong-hong XU Qiang ZHAN Wei-wei GRELLE Gerardo State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection Chengdu University of TechnologyChengdu 610059China Department of Civil and Environmental Engineering Tufts UniversityMedfordMA 02155USA Department of Civil and Environment Engineering University of RomeRome 00184Italy

Earthquakes can cause widely distributed slope failures and damage in mountainous *** accurate prediction of ground motions in mountainous areas is essential for managing the seismic risk of urban cities near mountains but is restricted primarily by complex seismic site amplification effects in areas of uneven *** study selected Qiaozhuang town located in the Qingchuan–Pingwu fault zone,Southwest China,as a case study.A simulator for mapped seismic responses using a hybrid model(Si Se RHmap)was applied to compute the multispectral seismic topographic amplification maps at the three slope units surrounding Qiaozhuang town(Weigan hill,***,and ***).Post-earthquake damage survey maps,1 D seismic site response spectral ratios,and H/V spectral ratios of earthquake data were used to validate the computed seismic site amplification factors and resonance *** results suggest that strong topographic amplification effects usually occur at distinct slope locations,such as hilltops,convex slope positions,upslope,and narrow *** computed topographic amplification factors in the study area reached up to 2.4 at upslope or hilltops,and the resonance frequencies were between 3 and 10 *** effects can be as important as stratigraphic effects when assessing seismic amplification effects in the study *** conclude that both topographic and stratigraphic effects should be considered in the comprehensive seismic hazard assessment of the study area or other similar mountain towns.

关键词： Seismic hazard prediction multispectral amplification map topographic effects Stratigraphic effects SiSeRHmap Wenchuan earthquake

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