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在对多层无衰减介质中地震波传播特性研究的基础上,通过选取典型衰减系数,研究了地震波在多层有衰减介质中的传播特性。通过计算地震波在各层有无衰减介质中的幅值和位移以及绘制相应的传播位移图,对比分析了衰减因素对不同地质分布中地震波传播特性的影响。研究结果表明在不考虑衰减情况下,地震波从震源经过多个不同地质分布层传播到地表面时,地震波的幅值均有不同程度的放大;而计入地质层的衰减因素后,地震波经过与上相同的多个不同地质分布层时,地震波幅值的放大程度将明显减小。特别的对于“表层-砾石层-岩石层-黏土层-基岩层”地质分布层,将最大程度地衰减地震波对地表层的影响。
Based on the study of seismic wave propagation characteristics in multi-layer non-decaying media, the propagation characteristics of seismic waves in multi-layered attenuation media are studied by choosing typical attenuation coefficients. By calculating the amplitude and displacement of seismic waves in the presence or absence of attenuation medium and mapping the corresponding displacement maps, the influence of attenuation factors on seismic wave propagation characteristics in different geologic distributions is analyzed. The results show that the amplitude of the seismic waves is magnified to different extents when the seismic waves propagate from the seismic source to the ground surface through different geological distribution layers without considering the attenuation. When the attenuation factors of the geological layers are included, On the same multiple different geological distribution layer, the extent of amplification of seismic amplitude will be significantly reduced. Especially for the “surface - gravel layer - rock layer - clay layer - bedrock ” geological distribution layer, will maximize the attenuation of seismic waves on the surface.