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首页> 外文期刊>Pure and Applied Geophysics >Effects of P-Wave and S-Wave Impedance Contrast on the Characteristics of Basin Transduced Rayleigh Waves
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Effects of P-Wave and S-Wave Impedance Contrast on the Characteristics of Basin Transduced Rayleigh Waves

机译：P波和S波阻抗对比对盆地感应瑞利波特性的影响

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摘要

Different aspects of body wave amplifications in a basin have been studied in detail in the past. However, the study on amplification of basin-transduced surface waves is very limited, although surface waves are more damaging as compared to body waves. This paper presents the effects of P-wave and S-wave impedance contrast (IC) at the basin-edge on the spectral amplification and complex mode transformation of basin-transduced Rayleigh (BTR) waves. BTR-waves, the acronym for basin-transduced Rayleigh waves, is used in the manuscript. Analysis of simulated results reveals a complex mode transformation of Rayleigh wave after entering the basin. The less dispersed horizontally polarised first mode and highly dispersed vertically polarised fundamental mode of BTR-waves were inferred in the basin. The first mode of BTR-waves is developed in a frequency bandwidth and the frequency content in that is very much dependent on the Poisson’s ratio and fundamental frequency of soil in the basin. An increase of phase velocity of first mode of BTR-waves with Poisson’s ratio is obtained. It is concluded that spectral amplification of BTR-waves depends on both the P-wave IC and S-wave IC at the basin-edge. An increase of the largest and average spectral amplifications of the horizontal component of the BTR-wave is obtained with the increase of both the P-wave IC and S-wave IC. On the other hand, an increase of the largest and average spectral amplification of the vertical component of the BTR-wave is obtained with the increase of P-wave IC, but such a systematic and significant effect is not inferred with the increase of S-wave IC at the basin-edge.
机译：过去已经详细研究了盆地中体波放大的不同方面。然而，尽管与体波相比，表面波的破坏性更大，但是对盆流式表面波的放大的研究非常有限。本文介绍了盆地边缘的P波和S波阻抗对比（IC）对盆地转换瑞利（BTR）波的频谱放大和复模转换的影响。手稿中使用了BTR波，即盆地转换瑞利波的缩写。对模拟结果的分析揭示了进入盆地后瑞利波的复杂模式转换。推测盆地中BTR波的水平极化的第一模态和水平极化的基本模态高度分散。 BTR波的第一种模式是在一个频率带宽中发展的，其频率含量在很大程度上取决于泊松比和盆地中土壤的基频。 BTR波的第一模的相速度随泊松比的增加而增加。可以得出结论，BTR波的频谱放大取决于流域边缘的P波IC和S波IC。随着P波IC和S波IC的增加，获得了BTR波的水平分量的最大和平均频谱放大率的增加。另一方面，随着P波IC的增加，获得了BTR波垂直分量的最大和平均频谱放大率的增加，但是，随着S-在流域边缘处波动IC。

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