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Observations of Rayleigh waves in Mexico City Valley during the 19 September 2017 Puebla–Morelos, Mexico earthquake
Earthquake Spectra ( IF 5 ) Pub Date : 2020-07-24 , DOI: 10.1177/8755293020942547
Pablo Heresi 1 , Jorge Ruiz-García 2 , Omar Payán-Serrano 3 , Eduardo Miranda 4
Affiliation  

This article discusses the principal features of Rayleigh surface waves generated by basin-edge effects in Mexico City during the Mw7.1 19 September 2017 Puebla–Morelos, Mexico earthquake. Rayleigh waves were extracted from ground motions recorded at 12 stations in Mexico City. We used a recently proposed method for extracting surface waves, where the earthquake record is filtered based on the normalized inner product of the Stockwell transform of the three-component earthquake recordings. Results of this study reveal that basin-edge effects produced strong Rayleigh waves, particularly at certain stations, with frequencies that are mainly between 0.2 and 0.9 Hz, which is consistent with previous frequency ranges reported in the literature. Evidence of higher-mode Rayleigh waves was found at all stations located on soft soil sites, even at stations that are more than 1 km away from the basin edges. It was also observed that peak acceleration spectral ordinates of the retrograde component of the extracted Rayleigh waves at two stations exceeded the design spectral ordinates of the 1976 and 2004 editions of the Mexico City Seismic Provisions.

中文翻译:

2017 年 9 月 19 日墨西哥普埃布拉-莫雷洛斯地震期间对墨西哥城山谷瑞利波的观测

本文讨论了 2017 年 9 月 19 日 Mw7.1 墨西哥普埃布拉-莫雷洛斯地震期间墨西哥城盆地边缘效应产生的瑞利面波的主要特征。瑞利波是从墨西哥城 12 个站点记录的地面运动中提取的。我们使用了最近提出的提取表面波的方法,其中根据三分量地震记录的斯托克韦尔变换的归一化内积过滤地震记录。这项研究的结果表明,盆地边缘效应产生了强烈的瑞利波,特别是在某些台站,频率主要在 0.2 和 0.9 Hz 之间,这与文献中报道的先前频率范围一致。在位于软土场地的所有站点都发现了高模瑞利波的证据,即使在距盆地边缘 1 公里以上的站点。还观察到在两个站点提取的瑞利波的逆行分量的峰值加速度谱纵坐标超过了 1976 年和 2004 年墨西哥城地震规定的设计谱纵坐标。
更新日期:2020-07-24
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