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首页> 外文会议>World conference on earthquake engineering;WCEE >ESTIMATION OF AMPLIFICATION CHARACTERISTICS OF THEGROUND DURING MODERATE EARTHQUAKES USING SIMULATEDMICROTREMORS
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ESTIMATION OF AMPLIFICATION CHARACTERISTICS OF THEGROUND DURING MODERATE EARTHQUAKES USING SIMULATEDMICROTREMORS

机译：用模拟微距估计中度地震期间地面的放大特性

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The characterization of ground amplification during moderate earthquakes has been task of severalresearches along last century. In most cases, characteristics of ground motion such as, predominantfrequency, amplification factor, damping, etc. have been discussed using the SH waves propagationtheory. However, the determination of appropriate depth of engineering base-layer for modeling soilprofile has been a controversial point. Parameters such as, S wave velocity or impedance contrast, havebeen used to discuss the depth of engineering base-layer, but the relationship is not clear. Likewise,verifications about above-mentioned characteristics have been difficult because of lack of observedearthquake ground motion records at the surface and at a certain depth for the same location, as well as,the availability of detailed reliable bore-hole log.This research shows some comparisons between the characteristics of observed horizontal transferfunction of moderate earthquake motion and H/V spectral ratio of simulated microtremors atseismological observation sites in Kik-net Akita Prefecture. This seismological observation networkpossesses two accelerometers installed at the surface and at a depth of more than 100m for each site.Observed horizontal transfer functions of moderate earthquake motions have been obtained by dividingrespective top and bottom horizontal Fourier amplitude spectra for each seismic event. The effect of thecharacteristics of wave input motion in observed transfer functions is supposed to be diminished.Likewise, physical parameters such as, thickness, P and S waves velocities and type of soil, at each site arealso available for modeling purposes.According to the results, the technique of simulated microtremors could be a useful tool forcharacterization of ground amplification during earthquakes. The possibility of identifying engineeringbase-layer, as well as, the estimation of amplification characteristics using simulated microtremors hasbeen probed successfully.
机译：上个世纪以来，中等地震期间地面放大的特征一直是几项研究的任务。在大多数情况下，已经使用SH波传播理论讨论了地面运动的特征，例如主要频率，放大系数，阻尼等。然而，确定合适的工程基础层深度来模拟土壤剖面一直是一个有争议的问题。诸如S波速度或阻抗对比之类的参数已被用来讨论工程基础层的深度，但这种关系尚不清楚。同样，由于缺乏在同一位置的地表和一定深度观察到的地震地动记录，以及缺乏详细可靠的井眼测井资料，因此很难对上述特征进行验证。 Kik-net秋田县中度地震运动的水平传递函数特征与模拟微震地震观测点的H / V谱比之间的比较。该地震观测网络在每个地点都具有两个安装在地面且深度超过100m的加速度计。通过将每个地震事件的顶部和底部水平傅立叶振幅谱分开，可以观察到中等地震运动的水平传递函数。波浪输入运动特性在观察到的传递函数中的影响应该被减小，同样，每个位置的厚度，P和S波速度和土壤类型等物理参数也可用于建模目的。因此，模拟微震技术可能是表征地震期间地面放大作用的有用工具。已经成功地探索了识别工程基础层的可能性以及使用模拟微震估计扩增特性的可能性。

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