作者
L Stehly, Michel Campillo, NM Shapiro
发表日期
2006/10
期刊
Journal of Geophysical Research: Solid Earth
卷号
111
期号
B10
简介
We study the origin of the background seismic noise averaged over long time by cross correlating of the vertical component of motion, which were first normalized by 1‐bit coding. We use 1 year of recording at several stations of networks located in North America, western Europe, and Tanzania. We measure normalized amplitudes of Rayleigh waves reconstructed from correlation for all available station to station paths within the networks for positive and negative correlation times to determine the seasonally averaged azimuthal distribution of normalized background energy flow (NBEF) through the networks. We perform the analysis for the two spectral bands corresponding to the primary (10–20 s) and secondary (5–10 s) microseism and also for the 20–40 s band. The direction of the NBEF for the strongest spectral peak between 5 and 10 s is found to be very stable in time with signal mostly coming from the …
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L Stehly, M Campillo, NM Shapiro - Journal of Geophysical Research: Solid Earth, 2006