云南地区背景噪声特征分析
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摘要
利用云南宽频带数字地震台网46个地震台连续记录的2008~2009年垂直向背景噪声,通过对台站对的背景噪声做互相关计算得到了台站间噪声互相关函数。基于互相关函数正负两个方向特性,分析云南地区5~10s、10~20s、20~40s共3个频段内高信噪比台站对的方位分布和季节变化特性,发现各个频段的优势方向均有差别,总体上看,云南地区的噪声源主要是来自近正东向和南南西向,可能受太平洋和印度洋的影响比较大。
We obtain the cross-correlation function of noise by processing two years' ambient noise recorded by 46 broad-band,permanent stations of Yunnan Seismic Network.We measure the signal-to-noise ratio(SNR)of Rayleigh waves for positive and negative correlation time lags at different period bands(5-10s,10-20,and 20-40s).we also determine the azimuthal distribution of the sources strong ambient-noise and seasonal variability.The principal directions of sources at different bands are different.Noise energy is dominant in the east and south-south west directions
We obtain the cross-correlation function of noise by processing two years' ambient noise recorded by 46 broad-band,permanent stations of Yunnan Seismic Network.We measure the signal-to-noise ratio(SNR)of Rayleigh waves for positive and negative correlation time lags at different period bands(5-10s,10-20,and 20-40s).we also determine the azimuthal distribution of the sources strong ambient-noise and seasonal variability.The principal directions of sources at different bands are different.Noise energy is dominant in the east and south-south west directions
引文
鲁来玉,何正勤,丁志峰,等.2009.华北科学探测台阵背景噪声特征分析[J].地球物理学报,52(10):2566-2572.
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Ekstrom G.2001.Time domain analysis of Earth s long period backgroundseismic radiation[J].J Geophys Res,106(26):483-493.
Friederich A,Kruger F,Klinge K.1998.Ocean-generated microseismicnoise located with the GRFO array[J].Journal of Seismology,2(1):47-64.
LinF,Moschetti MP,Ritzwoller M H.2008.Surface wave tomography ofthe western United States from ambient seismic noise:Rayleigh andLove wave phase velocity maps[J].Geophys J Int,173(1):281-298.
Pedersen H,Kruger,the SVEKALAPKO Seismic Tomography WorkingGroup.2007Influence of the seismic noise characteristics on noisecorrelations in the Baltic shield[J].Geophys J Int,168(l):197-210.
Shapiro,N M,Campillo M,Stehly L,et al.2005.High-resolution surface-wave tomography from ambient seismic noise[J].Science307:1615-1618.
Stehly L,Campillo M,Shapiro N M.2006.A study of the seismic noisefrom its long range correlation properties[J].Journal of GeophysicalResearch,111,B10306.
Tanimoto T,Um J,Nishida K,et al.1998.Earth s continuous oscillationsobserved seismically quiet days[J].Geophys Res Lett,25(10):1553-1556.
Weaver R L,Lobkis O I.2001.Ultrasonics without a source:thermal fluc-tuation correlations at MHz frequencies[J].Physical Review Letter,87(13),134301.
Yang Y,Ritzwoller MH.2008.Characteristics of ambient seismic noise asa source for surface wave tomography,Geochem[J].Geophys Geo-syst,9,Q02008,doi:10.1029/2007GC001814.
Yao H,Hilst R D van der,Hoop M V.2006.Surface-wave tomography inSE Tibet from ambient seismic noise and two-station analysis:I-Phase velocity maps[J].Geophys J Int,166:732-744,doi:10.1111/j.1365-246X.2006.03028.x.
Bensen G D,Ritzwoller M H,Shapiro N M.2007.Broad-band ambientnoise surface wave tomography across the United States[J].J geo-phys Res,113,doi:10.1029/2007JB005248.
Derode A,Larose E,Tanter M,et al.2003.Recovering the Green s func-tion from field-field correlations in an open scattering medium[J].JAcoust Soc Am,113(6),2973-2976.
Ekstrom G.2001.Time domain analysis of Earth s long period backgroundseismic radiation[J].J Geophys Res,106(26):483-493.
Friederich A,Kruger F,Klinge K.1998.Ocean-generated microseismicnoise located with the GRFO array[J].Journal of Seismology,2(1):47-64.
LinF,Moschetti MP,Ritzwoller M H.2008.Surface wave tomography ofthe western United States from ambient seismic noise:Rayleigh andLove wave phase velocity maps[J].Geophys J Int,173(1):281-298.
Pedersen H,Kruger,the SVEKALAPKO Seismic Tomography WorkingGroup.2007Influence of the seismic noise characteristics on noisecorrelations in the Baltic shield[J].Geophys J Int,168(l):197-210.
Shapiro,N M,Campillo M,Stehly L,et al.2005.High-resolution surface-wave tomography from ambient seismic noise[J].Science307:1615-1618.
Stehly L,Campillo M,Shapiro N M.2006.A study of the seismic noisefrom its long range correlation properties[J].Journal of GeophysicalResearch,111,B10306.
Tanimoto T,Um J,Nishida K,et al.1998.Earth s continuous oscillationsobserved seismically quiet days[J].Geophys Res Lett,25(10):1553-1556.
Weaver R L,Lobkis O I.2001.Ultrasonics without a source:thermal fluc-tuation correlations at MHz frequencies[J].Physical Review Letter,87(13),134301.
Yang Y,Ritzwoller MH.2008.Characteristics of ambient seismic noise asa source for surface wave tomography,Geochem[J].Geophys Geo-syst,9,Q02008,doi:10.1029/2007GC001814.
Yao H,Hilst R D van der,Hoop M V.2006.Surface-wave tomography inSE Tibet from ambient seismic noise and two-station analysis:I-Phase velocity maps[J].Geophys J Int,166:732-744,doi:10.1111/j.1365-246X.2006.03028.x.
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