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Application of temporal reweighting to ambient noise cross-correlation for improved seismic Green's function
Geophysical Journal International ( IF 2.8 ) Pub Date : 2020-01-06 , DOI: 10.1093/gji/ggaa001
Jiangtao Li 1 , Richard L Weaver 2 , John Y Yoritomo 2 , Xiaodong Song 1, 3
Affiliation  

SUMMARY
Due to the partly diffuse character of ambient noise, the retrieval of amplitude information and attenuation from noise cross-correlations has been difficult. Here, we apply the temporal reweighting method proposed by Weaver & Yoritomo to seismic data from the USArray in the central-midwest US. The results show considerable improvements in retrieved Green's functions in both symmetry and causality. The reweighting is able to make the effective incident noise field more isotropic (though not yet truly isotropic). It produces more robust amplitude measurements and also makes both the causal and anticausal parts usable. This suggests that it could be widely applicable for retrieval of Green's functions from ambient noise for attenuation study. The results also suggest an alternative measure of signal-to-noise ratio that complements the conventional one.


中文翻译:

时间加权在环境噪声互相关中的应用,以改善地震格林函数

概要
由于环境噪声的部分扩散特性,很难获取幅度信息和噪声互相关的衰减。在这里,我们将Weaver&Yoritomo提出的时间重加权方法应用于来自美国中西部中部USArray的地震数据。结果表明,在对称性和因果关系方面,检索到的格林函数都有了很大的改进。重新加权能够使有效入射噪声场更加各向同性(尽管还不是真正的各向同性)。它可以产生更健壮的幅度测量值,并且可以同时使用因果和反因果部分。这表明它可以广泛应用于从环境噪声中提取格林函数进行衰减研究。
更新日期:2020-02-07
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