Comparing time domain Green's functions with simulated noise and ambient noise data cross‐correlation for a horizontal array

2008 ◽  
Vol 123 (5) ◽  
pp. 3630-3630
Author(s):  
Stephanie Fried ◽  
Karim G. Sabra ◽  
Philippe Roux ◽  
William A. Kuperman
Keyword(s):  
Time Domain ◽  
Ambient Noise ◽  
Green's Functions ◽  
Cross Correlation ◽  
Green’S Functions ◽  
Noise Data ◽  
Horizontal Array

Application of temporal reweighting to ambient noise cross-correlation for improved seismic Green's function

2020 ◽  
Vol 221 (1) ◽  
pp. 265-272
Author(s):  
Jiangtao Li ◽  
Richard L Weaver ◽  
John Y Yoritomo ◽  
Xiaodong Song
Keyword(s):  
Seismic Data ◽  
Ambient Noise ◽  
Green's Functions ◽  
Cross Correlation ◽  
Green’S Functions ◽  
Signal To Noise Ratio ◽  
Alternative Measure ◽  
Signal To Noise ◽  
Cross Correlations ◽  
Noise Cross Correlation

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.

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