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- W2015668766 abstract "Cross correlation of ambient noise recorded by broadband seismometers has become a popular data analysis technique. Because time-averaged cross-correlation functions provide estimates of the Green’s function between two stations, they provide arrival information for waves propagating in opposite directions along a line connecting the stations. Under certain circumstances, amplitude asymmetry in these functions can be associated with preferred directionality of the noise field surrounding the stations. An interesting example of asymmetric cross-correlation functions comes from the site of the 1992 Pakistan Himalayas passive source broadband seismic experiment (PAKH). Here, the comparison of causal and acausal signal-to-noise ratios in several period bands gives an indication of the noise field directivity. The analysis also reveals frequency-dependent asymmetry of the cross-correlation functions, suggesting multiple sources of the ambient noise. At PAKH, some portion of the 6–10 sec noise field band may be attributed to distant ocean wave activity, as seen in other studies, but other period bands show noise propagation from the opposite direction. Our directivity analysis suggests that the regional tectonics of the Indo–Eurasian collision and/or its associated microseismicity may be contributing strongly to the apparent noise field, either by acting as a dominant scatterer or as a noise source." @default.
- W2015668766 created "2016-06-24" @default.
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- W2015668766 date "2009-02-01" @default.
- W2015668766 modified "2023-09-23" @default.
- W2015668766 title "Frequency-Dependent Asymmetry of Seismic Cross-Correlation Functions Associated with Noise Directionality" @default.
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- W2015668766 doi "https://doi.org/10.1785/0120080023" @default.
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