Abstract

The article presents a numerical study of the formation of the amplitude response in a free surface from simultaneous scattering of Rayleigh waves and vertically incident longitudinal waves by an embedded contrast velocity inclusion. It has been established that the significant presence of body waves in a microseismic field does not fundamentally change the result of the microseismic sounding method, which is based on the notion of the overwhelming contribution of the fundamental mode of a Rayleigh wave to the formation of the Earth’s microseismic field. Cases are considered when a microseismic signal at the same frequency is modeled only by the fundamental mode of the Rayleigh wave, only by a vertically incident longitudinal wave, and by both types of waves simultaneously. Variants of inhomogeneities with different dimensions and velocity properties are considered. The analysis was performed in a (λ, r)-space, in analogy with reconstruction of the structure of the geological setting in the microseismic sounding method, where λ is the wavelength of the fundamental Rayleigh mode and r is the coordinate on the Earth’s surface.

中文翻译：

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体波的贡献对微震探测方法结果的影响

摘要

这篇文章提出了一个数值研究，该结果是通过嵌入的对比速度夹杂物，同时散射瑞利波和垂直入射的纵波，在自由表面形成振幅响应的数值研究。已经确定，在微地震场中体波的显着存在并不能从根本上改变微地震测深方法的结果，该方法基于瑞利波基本模式对地震形成的巨大贡献这一概念。地球的微地震场。考虑仅通过瑞利波的基本模式，仅垂直入射的纵波以及同时使用两种波对相同频率的微地震信号进行建模的情况。考虑具有不同尺寸和速度特性的不均匀性的变化。分析是在（λ，[R ）空间中，与微震探测方法地质设置，其中，λ是基波瑞利模式的波长和结构的重建类比- [R是地球表面上的坐标。