Application of temporal reweighting to ambient noise cross-correlation for improved seismic Green's function
| Autor: | Xiaodong Song, John Y. Yoritomo, Jiangtao Li, Richard L. Weaver |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Cross-correlation Acoustics Ambient noise level Seismic interferometry Seismic noise 010502 geochemistry & geophysics 01 natural sciences symbols.namesake Geophysics Geochemistry and Petrology Green's function symbols Geology 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Journal International. 221:265-272 |
| ISSN: | 1365-246X 0956-540X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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