【摘要】 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。更多还原

【Abstract】 Based on the previous research of the spreading characteristics of the seismic wave in various geological layers without the attenuation,we have discussed the spreading characteristics of the seismic waves in a multi-layer medium by taking into account the typical attenuating coefficients.The amplitudes and the displacement of the seismic wave in various geological layers with the attenuation are calculated,and the spreading figures for the displacement of the seismic wave are plotted.Therefore the effects of different geological distributions with the attenuating coefficients on the spreading characteristics of the seismic wave are finally illustrated.The results have shown that the amplitudes of the seismic wave will be amplified to some extent while the seismic wave spreads through the various geological layers without considering the attenuation.On the contrary,when the attenuations in the various geological layers are considered,the amplification of the amplitudes of the seismic wave will be decreased obviously.Especially,the geological layer combination of ’upper layer-gravel layer-rock layer-clay layer-bedrock layer’ will attenuate the effect of the seismic wave to the upper layer to a great extent.更多还原