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首页> 外文期刊>Pure and Applied Geophysics >Role of Shape and Numbers of Ridges and Valleys in the Insulating Effects of Topography on the Rayleigh Wave Characteristics
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Role of Shape and Numbers of Ridges and Valleys in the Insulating Effects of Topography on the Rayleigh Wave Characteristics

机译：脊和山谷的形状和数量在瑞利波特征上的绝缘效应中的作用

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摘要

This research work is inspired by the recently accepted concept that high frequency Rayleigh waves are generated in the epicentral zone of shallow earthquakes. Such high frequency Rayleigh waves with large amplitude may develop much of spatial variability in ground motion which in turn may cause unexpected damage to long-span structures like bridges, underground pipelines, dams, etc., in the hilly regions. Further, it has been reported that topography acts as an insulator for the Rayleigh waves (Ma et al. BSSA 97:2066-2079, 2007). The above mentioned scientific developments stimulated to quantify the role of shape and number of ridges and valleys falling in the path of Rayleigh wave in the insulating effect of topography on the Rayleigh waves. The simulated results reveals very large amplification of the horizontal component of Rayleigh wave near the top of a triangular ridge which may cause intensive landslides under favorable condition. The computed snapshots of the wave-field of Rayleigh wave reveals that the interaction of Rayleigh wave with the topography causes reflection, splitting, and diffraction of Rayleigh wave in the form of body waves which in turn provides the insulating capacity to the topography. Insulating effects of single valley is more than that of single ridge. Further this effect was more in case of elliptical ridge/valley than triangular ridge/valley. The insulating effect of topography was proportional to the frequency of Rayleigh wave and the number of ridges and valleys in the string. The obtained level of insulation effects of topography on the Rayleigh wave (energy of Rayleigh wave reduced to less than 4% after crossing a topography of span 4.5 km) calls for the consideration of role of hills and valleys in seismic hazard prediction, particularly in case of shallow earthquakes.
机译：这项研究工作受到最近公认的概念，即高频瑞利波在浅地震的震中区域产生的高频瑞利波。具有大振幅的这种高频瑞利波可能在地面运动中产生大部分空间变异性，这又可能对丘陵地区的桥梁，地下管道，水坝等的长跨度结构造成意外损坏。此外，据报道，地形行为充当瑞利波的绝缘体（Ma等人。BSSA 97：2066-2079,2007）。上述科学发展刺激了量化脊和山谷的形状和数量落入瑞利波路径的作用，以在瑞利波上的绝缘效果。模拟结果揭示了三角形脊顶部附近的瑞利波水平分量的大大放大，这可能会在有利的情况下引起密集的滑坡。瑞利波的波场的计算快照显示，瑞利波与地形的相互作用导致瑞利波以体波形式的反射，分裂和衍射，这又提供了对地形的绝缘容量。单谷的绝缘效果远远超过单脊的效果。进一步的这种效果在椭圆脊/山谷的情况下比三角脊/谷更高。地形的绝缘效果与瑞利波的频率和弦中的脊和山谷的数量成比例。在瑞利波上获得的地形的绝缘效果水平（在横向4.5公里的地形交叉后瑞利波的能量降至小于4％）要求考虑山丘和山谷在地震危险预测中的作用，特别是在情况下浅地震。

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