Distribution of seismic noise sources and an application to geophysics
DOI:
https://doi.org/10.33064/iycuaa2019761788Keywords:
P and SV waves, Greens function, energy distributions, seismic sources, displacement fieldsAbstract
By correlating the seismic noise, it is possible to recover one of the most important characteristics of the structure of the medium where seismic waves propagate, such characteristic is known as the Green´s function. However, it's necessary to study the influence of the seismic noise distribution in order to estimate whether the recovered Green´s function will be accurate. This work shows a formulation that allows obtaining the Green function for different distributions of seismic noise sources. First, the exact Green functions are used, and the energy contents of the P and SV waves are studied. Afterwards, the relationship of the exact Green function and that recovered by seismic noise is shown. Subsequently, several seismic source distributions are analyzed, mainly isotropic and collinear, and some elements that allow us to assess which of them can lead to obtain the Green´s function with good approximation are exposed.
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