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Effects of soil amplification ratio and multiple wave interference for ground motion due to earthquake

机译：土壤放大率和多波干扰对地震地震动的影响

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摘要

Influences on the ground motion simulations by soil amplification effects and multiple seismic wave interferences in the heterogeneous medium are investigated. Detailed velocity structure obtained from the microtremor array survey is adopted in the ground motion simulation. Analyses for amplification ratios of core samples of ten drill holes with 40 m deep in the sedimentary layers show that the soil amplification ratio influences nonlinearly the seismic ground motion. Based on the above analysis results, the ground motion in the heavily damaged zone in the Japanese Kobe earthquake of 1995 is simulated in a digital SH seismic wave model by using the pseudospectral method with the staggered grid RFFT differentiation (SGRFFTD). The simulated resnfts suggest that the heterogeneous velocity structure results in a complicated distribution of the maximum amplitudes of acceleration waveforms with multiple peaks at the surface. Spatial distribution of the maximum amplitudes coincides well with that of collapse ratios of buildings in Kobe. The dual peaks of the collapse ratios away from the earthquake fault coincide well with the double peak amplitudes of simulated seismic acceleration waves also. The cause for the first peak amplitude of the ground motion is attributable to the interference of the secondary surface wave from the bedrock propagating horizontally along the surface sedimentary layer and the body wave from the basin bottom according to analyses of wave snapshots propagating in inhomogeneous structure of the Osaka group layers. The second peak amplitude of the ground motion may be attributive to the interference of the secondary surface wave from the tunneling waves in the shallow sediments the body wave. It is important for the study on complicated distributions of earthquake damages to investigate influences on the ground motion by soil amplification effects and multiple seismic wave interferences due to the structure. Explorations of the structure to the bedrock are necessary for the urban mitigation disaster. Seismic wave simulations are valid for aseismatic study.
机译：研究了非均质介质中土壤放大效应和多重地震波干扰对地震动模拟的影响。在地面运动模拟中采用了从微震阵列勘测获得的详细速度结构。对沉积层中10个深40 m深的钻孔岩心样品的放大率分析表明，土壤放大率对地震地震动具有非线性影响。基于以上分析结果，使用具有交错网格RFFT微分（SGRFFTD）的伪谱方法，在数字SH地震波模型中模拟了1995年日本神户地震中重灾区的地面运动。仿真结果表明，异质速度结构导致表面上具有多个峰的加速度波形最大振幅的复杂分布。最大振幅的空间分布与神户建筑物的倒塌率非常吻合。远离地震断层的坍塌比的双峰也与模拟地震加速度波的双峰幅度非常吻合。地震动第一个峰值的原因是根据基岩非均匀结构中传播的波快照的分析，来自基岩沿表面沉积层水平传播的次生面波和来自盆地底部的体波的干扰。大阪小组图层。地面运动的第二峰值幅度可归因于次表面波对浅沉积物中体波的隧穿波的干扰。对于研究地震破坏的复杂分布，研究土壤放大效应和结构引起的多重地震波干扰对地震动的影响非常重要。对基岩结构的探索对于城市减灾来说是必要的。地震波模拟对于防震研究是有效的。

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