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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Examination of the vertical earthquake ground motion component during the September 19, 2017 (M_w = 7.1) earthquake in Mexico City
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Examination of the vertical earthquake ground motion component during the September 19, 2017 (M_w = 7.1) earthquake in Mexico City

机译：在2017年9月19日墨西哥城地震（M_w = 7.1）期间检查垂直地震地震动分量

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摘要

This technical note aims at investigating the earthquake ground motion and spectral features of the vertical component motions recorded at soft soil sites in Mexico City during the strong September 19, 2017 Puebla-Morelos (M-w = 7.1) earthquake by means of examining ground motion (EQGM) features, vertical-to-horizontal (V/H) spectral ratios, and comparison with design spectra ordinates. EQGM features of vertical components recorded at 10 accelerographic stations revealed that they have shorter mean periods than their corresponding horizontal components, and long significant duration. In addition, V/H spectral ratios are larger than one in 6 stations for periods of vibrations between 0.22 s and 0.56s. Mean V/H ratios confirmed that the trend depends on the period of vibration and the vertical component could be more important for short-period structures than medium-to-long period structures. Since current Mexico City seismic regulations do not include recommendations to account for the vertical component, it is showed that the simple rule of reducing the horizontal acceleration design spectrum prescribed in the recently released 2017 Mexico City seismic regulations by 2/3 is enough to cover the mean + one-standard deviation vertical acceleration response spectrum.
机译：本技术说明旨在通过检查地震动（EQGM）来调查2017年9月19日普埃布拉莫雷洛斯（Mw = 7.1）强烈地震期间墨西哥城软土场地记录的地震地震动和垂直分量运动的频谱特征）功能，垂直/水平（V / H）光谱比以及与设计光谱纵坐标的比较。在10个加速度测量站记录的垂直分量的EQGM特征表明，它们的平均周期比相应的水平分量要短，并且有效期较长。此外，在0.22 s和0.56 s之间的振动周期内，V / H谱比大于6个站中的1个。平均V / H比值证实趋势取决于振动周期，垂直分量对于短周期结构比中长期结构更为重要。由于当前的墨西哥城地震法规未包含考虑垂直分量的建议，因此表明，将最近发布的2017年墨西哥城地震法规中规定的水平加速度设计频谱降低2/3的简单规则足以涵盖以下内容：平均值+一标准偏差垂直加速度响应谱。

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