多路径传递函数修正法预测城市尺度上的站点特异性放大

IF 2.6 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Miroslav Hallo, Paolo Bergamo, Donat Fäh
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引用次数: 0

摘要

地震波的特定场址放大是局部地震危险性评价的重要组成部分。它可以从经验数据进行评估,但测量仅在有限的位置是可行的。因此,在城市尺度上,有必要对放大进行理论预测和插值。在本文中,我们介绍了一种基于物理的方法来预测宽频率范围内的特定位点放大和持续时间。该方法基于一种新的基于能量的波在随机非均质粘弹性介质中多径传播的概念。放大用多径波传播的地表-露头传递函数表示,该传递函数由能谱比的期望值定义。将该方法应用于瑞士z里奇市近地表二维速度模型。通过附近地震台站的经验数据验证了预测的放大效果,并与土壤类别和其他现场条件指标进行了比较。最后,通过预测2022年ML 4.7米卢斯地震的现场地震波形和反应谱,验证了该方法的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multipath Transfer-Function Correction Method to Predict Site-Specific Amplification at City Scale
Abstract The site-specific amplification of seismic waves is an essential component of local seismic hazard assessment. It can be evaluated from empirical data, but measurements are feasible just in a limited number of locations. Hence, at the city scale, there is a need for the theoretical prediction and interpolation of the amplification. In this article, we introduce a physics-based method to predict the site-specific amplification and duration in a broad frequency range. The method is based on a novel energy-based concept of the multipath propagation of waves in viscoelastic media with random heterogeneities. The amplification is expressed by the surface-outcrop transfer function of the multipath wave propagation, which is defined by expected values of the energy spectral ratio. The method is applied to the near-surface 2D velocity model in the city of Zürich in Switzerland. The predicted amplification is validated by empirical data at a nearby seismic station, and it is compared with the soil class and other site-condition proxies. Finally, the method performance is demonstrated by the prediction of site-specific seismic waveforms and response spectra for the 2022 ML 4.7 Mulhouse earthquake.
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来源期刊
Seismological Research Letters
Seismological Research Letters 地学-地球化学与地球物理
CiteScore
6.60
自引率
12.10%
发文量
239
审稿时长
3 months
期刊介绍: Information not localized
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