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Interactions between topographic irregularities and seismic ground motion investigated using a hybrid FD-FE method

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Abstract

A hybrid method combining finite element and 4th-order finite difference techniques is developed to model SH and P-SV seismic wave propagation in a 2D elastic medium with irregular surface topography. Both the classic staggered grid finite difference scheme and the partially staggered grid scheme are tested. The accuracy of the hybrid method is studied by comparison with a semi-analytical and another numerical method. Subsequently, to study the amplification, numerical simulations of seismic wave propagation in a series of hills are carried out and compared with the single-hill case. Depending on the position of the source in relation to the topography, the ratio between the heights and lengths of the hills or the ratio between the lengths of the hills and the wavelength, the presence of several hills as opposed to a single one can increase the amplification effect due to topography. This study highlights the fact that, when evaluating topographic site effects, surrounding topography must be taken into account in addition to local topography.

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Authors and Affiliations

  1. BRGM, 3 Avenue Claude Guillemin, BP 36009, 45060, Orléans Cedex 2, France

    Ariane Ducellier & Hideo Aochi

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  1. Ariane Ducellier
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  2. Hideo Aochi
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Correspondence to Ariane Ducellier.

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Ducellier, A., Aochi, H. Interactions between topographic irregularities and seismic ground motion investigated using a hybrid FD-FE method. Bull Earthquake Eng 10, 773–792 (2012). https://doi.org/10.1007/s10518-011-9335-6

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  • DOI: https://doi.org/10.1007/s10518-011-9335-6

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