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首页> 外文期刊>Geofisica internacional >Unusual, equivocal Rayleigh-dispersion curves for simple models taking into account the special propagation conditions in the valley of Mexico City (CDMX) - Preliminary results
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Unusual, equivocal Rayleigh-dispersion curves for simple models taking into account the special propagation conditions in the valley of Mexico City (CDMX) - Preliminary results

机译：考虑到墨西哥城河谷（CDMX）特殊的传播条件，简单模型的反常瑞利色散曲线不明确-初步结果

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Abstract:Other than commonly assumed in seismology, the phase velocity of Rayleigh waves not necessarily is a single-valued function of frequency. We demonstrate this for the first higher mode in simple models of a homogeneous layer on top of a homogeneous halfspace (LOH), which are used for the subsurface of the Texcoco zone in Mexico City valley in previous studies. In the structure of a homegenous layer with fixed bottom (LFB) the phenomenon exists for values of Poisson’s ratio between 0.19 and 0.5 and is most pronounced for P-velocity being three times S-velocity (Poisson’s ratio of 0.4375). This type of dispersion is demonstrated and a discussion of their possible fatal consequences for methods customarily used in seismology for dispersion analysis and synthesis of dispersion relations is presented.
机译：摘要：除了地震学中通常假定的以外，瑞利波的相速度不一定是频率的单值函数。我们在均质半空间（LOH）顶部的均质层的简单模型中为第一个更高模式演示了这一点，以前的研究将其用于墨西哥城山谷Texcoco区的地下。在具有固定底部的自生层（LFB）的结构中，泊松比值介于0.19和0.5之间时会出现这种现象，并且P速度是S速度的三倍（泊松比为0.4375）时最为明显。演示了这种类型的色散，并讨论了它们对于地震学中通常用于色散分析和色散关系合成的方法可能造成的致命后果的讨论。

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