Seismic Wave Amplification in 3D Alluvial Basins: Aggravation factors from Fast Multipole BEM Simulations

Abstract : In this work, we study seismic wave amplification in alluvial basins having 3D canonical geometries through the Fast Multipole Boundary Element Method in the frequency domain. We investigate how much 3D amplification differs from the 1D (horizontal layering) and the 2D cases. Considering synthetic incident wave-fields, we examine the relationships between the amplification level and the most relevant physical parameters of the problem (impedance contrast, 3D aspect ratio, vertical and oblique incidence of plane waves). The FMBEM results show that the most important parameters for wave amplification are the impedance contrast and equivalent shape ratio. Using these two parameters, we derive simple rules to compute the fundamental frequency for different 3D basin shapes and the corresponding 3D aggravation factor for 5% damping.Effects on amplification due to 3D basin asymmetry are also studied and incorporated in the derived rules.
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Communication dans un congrès
16th World Conference on Earthquake Engineering, Jan 2017, Santiago, Chile. 2017
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https://hal-brgm.archives-ouvertes.fr/hal-01309474
Contributeur : Kristel Meza Fajardo <>
Soumis le : vendredi 29 avril 2016 - 15:41:29
Dernière modification le : jeudi 15 mars 2018 - 14:28:06

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  • HAL Id : hal-01309474, version 1

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Kristel Carolina Meza Fajardo, Jean-François Semblat, Stéphanie Chaillat, Luca Lenti. Seismic Wave Amplification in 3D Alluvial Basins: Aggravation factors from Fast Multipole BEM Simulations. 16th World Conference on Earthquake Engineering, Jan 2017, Santiago, Chile. 2017. 〈hal-01309474〉

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