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Study of Basin-edge Effects on the Ground Motion Characteristics Using 2.5-D Modelling

机译：使用2.5维建模研究盆地边缘对地面运动特征的影响。

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摘要

This paper presents the role of basin-edge geometry in the generation of surface waves using 2.5-D modelling. The simulated responses of various basin-edge models revealed surface wave generation near the basin edge and their propagation normal to the edge. Seismic responses of basin-edge models using different fundamental frequency of soil along with spectral analysis of differential ground motion confirmed that surface waves start generating near the basin edge when body-wave frequency exceeds the fundamental frequency of soil. Spectral analysis of differential ground motion also confirmed the generation of high frequency surface wave. An increase of surface-wave amplitude with soil thickness was obtained. Large ground displacement observed near the basin edge may be due to the interference of surface/diffracted waves with the direct waves and their multiples. The effect of edge roughness on the surface-wave characteristics was found to be negligible as compared with the edge geometry. Simulated results revealed a decrease of surface-wave amplitude with edge slope, particularly in the case of surface waves caused by S waves. Surface wave generation near the basin edge was obtained for all four considered angles of incidence. At the same time, it was also inferred that the characteristics of these surface waves depend on the angle of incidence to some extent. The findings of this paper reveal that basin-edge effects deserve a particular attention for the purpose of earthquake-resistant design and seismic microzonation.
机译：本文介绍了使用2.5维建模在盆地边缘几何体在生成表面波中的作用。各种盆地边缘模型的模拟响应揭示了盆地边缘附近的表面波产生及其垂直于边缘的传播。使用不同土壤基本频率的盆地边缘模型的地震响应以及差分地面运动的频谱分析证实，当体波频率超过土壤基本频率时，在盆地边缘附近开始产生表面波。差分地面运动的频谱分析也证实了高频表面波的产生。获得了表面波振幅随土壤厚度的增加。在盆地边缘附近观察到大的地面位移可能是由于表面波/衍射波对直达波及其倍数的干扰。与边缘几何形状相比，发现边缘粗糙度对表面波特性的影响可以忽略。模拟结果表明，表面波振幅随边坡而减小，特别是在由S波引起的表面波的情况下。对于所有四个入射角，都获得了盆边缘附近的表面波生成。同时，还推断出这些表面波的特性在一定程度上取决于入射角。本文的发现表明，为抗震设计和地震微区划的目的，盆缘效应值得特别关注。

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