青藏高原东北缘背景噪声特征分析
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摘要
采用2009年青藏高原东北缘55个数字化宽频带地震台站的垂直分量波形数据,计算了台站间噪声互相关函数,得到了Rayleigh经验格林函数。利用信噪比和归一化平均能量流的方法分析了青藏高原东北缘背景噪声源的方位分布和季节性变化特征。结果表明,5~10 s周期噪声源方位分布上较为稳定,不随季节变化,噪声源能量集中在105°~165°方向上,噪声源主要来自于太平洋。10~20 s周期噪声源季节性变化特征明显,夏季的噪声能量主要集中在165°~210°方向上,噪声源来自于印度洋海洋活动;冬季主要集中在300°~350°和165°~210°方向上,噪声能量主要来源于太平洋和北大西洋。
Basing on the vertical component waveforms recorded by 55 digital broadband seisimic stations located at the northeastern margin of the Tibetan Plateau,we calculate the cross-correlation Green functions of ambient seismic noise between two stations,and obtain the Rayleigh wave empirical Green's function. The techniques of signalto-noise ratios( SNR) and normalized average energy flux of Rayleigh wave are applied to analyze the azimuthal distribution and seasonal variability of ambient noise sources in the northeastern margin of the Tibetan Plateau.In the period of 5 ~ 10 s,the azimuthal distribution of noise source is stable,and don't change with the season.The energy of noise source focuses on the azimuth of 105° ~ 165°,which is mainly affected by Pacific Ocean.In the period of 10 ~ 20 s,the azimuthal of noise source varies seasonally,and the energy of noise source focuses on the azimuth of 165° ~ 210° in summer and moves to the azimuth of 300° ~ 350° and 165° ~ 210° in winter,which suggests that the noise source may be affected by the Indian Ocean in summer,the Pacific and North Pacific Oceans in winter.
引文
房立华,吴建平,吕作.2009.华北地区基于噪声的瑞利面波群速度层析成像[J].地球物理学报,52(3):663-671.
    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.
    王伟涛,倪四道,王宝善.2011.云南地区地脉动噪声特征分析研究[J].地震,31(4):58-67.
    Bensen G.D.,Ritzwoller M.H.,Barmin M.P.,et al..2007.Processingseismic ambient noise data to obtain reliable broad-band surfacewave dispersion measurements[J].Geophysical Journal International,169(3):1239-1260.doi:10.1111/j.1365-246X.2007.03374.x.
    Brenguier F.,Shapiro N.M.,Campillo M.,et al..2008.Towards forecasting volcanic eruptions using seismic noise[J].Nature Geoscience,1(2):126-130.doi:10.1038/ngeo104.
    Brooks L.A.,Townend J.,Gerstoft P.,et al..2009.Fundamental andhigher-mode Rayleigh wave characteristics of ambient seismic noisein New Zealand[J].Geophysical Research Letters,36(23):doi:10.1029/2009GL040434.
    Derode A.,Larose E.,Tanter M.,et al..2003.Recovering the Green'sfunction from field-field correlations in an open scattering medium[J].The Journal of the Acoustical Society of America,113(6):2973-2976.doi:10.1121/1.1570436
    Friedrich A.,Krüger F.,Klinge K..1998.Ocean-generated MicroseismicNoise Located with the Gr Fenberg Array[J].Journal of Seismology,2(1):47-64.
    Kedar S.,Longuet-Higgins M.,Webb F.,et al..2008.The Origin ofDeep Ocean Microseisms in the North Atlantic Ocean[J].Proceedings of the Royal Society A.,464(2091):777-793.doi:10.1098/rspa.2007.0277.
    Li H.,Su W.,Wang C.Y.,et al..2009.Ambient Noise Rayleigh WaveTomography in Western Sichuan and Eastern Tibet[J].Earth andPlanetary Science Letters,282(1-4),201-211.doi:10.1016/j.epsl.2009.03.021.
    Lin F.C.,Moschetti M.P.,Ritzwoller M.H..2008.Surface Wave Tomography of the Western United States from Ambient Seismic Noise:Rayleigh and Love Wave Phase Velocity Maps[J].Geophysical Journal International,173(1):281-298.doi:10.1111/j.1365-246X.2008.03720.x.
    Longuet-Higgins M.S..1950.A Theory of the Origin of Microseisms[J].Philosophical Transactions of the Royal Society A:Mathematical,Physical and Engineering Sciences,243(857):1-35.doi:10.1098/rsta.1950.0012.
    Minato S.,Tsuji T.,Ohmi S.,et al.2012.Monitoring Seismic VelocityChange caused by the 2011 Tohoku-oki Earthquake using AmbientNoise Records[J].Geophysical Research Letters,39(9):doi:10.1029/2012GL051405.
    Pedersen H.A.,Krüger F..2007.Influence of the Seismic Noise Characteristics on Noise Correlations in the Baltic Shield[J].GeophysicalJournal International,168(1):197-210.doi:10.1111/j.1365-246X.2006.03177.x.
    Roux P.,Sabra K.G.,Kuperman W.A.,et al..2005.Ambient NoiseCross Correlation in Free Space:Theoretical Approach[J].TheJournal of the Acoustical Society of America,117(1):79.doi:10.1121/1.1830673.
    Sabra K.G.,Gerstoft P.,Roux P.,et al.2005.Surface Wave Tomographyfrom Microseisms in Southern California[J].Geophysical ResearchLetters,32(14):doi:10.1029/2005GL023155.
    Sabra K.G.2005.Extracting time-domain Green's Function Estimatesfrom Ambient Seismic Noise[J].Geophysical Research Letters,32(3):doi:10.1029/2004gl021862
    Shapiro N.M.,Campillo M.,Stehly L.,et al..2005.High-resolutionSurface-wave Tomography from Ambient Seismic Noise[J].Science,307(5715):1615-1618.doi:10.1126/science.1108339.
    Snieder R..2004.Extracting the Green's Function from the Correlation ofCoda Waves:A Derivation based on Stationary Phase[J].PhysicalReview E,69(4):doi:10.1103/PhysRev E.69.046610.
    Stehly L.,Campillo M.,Shapiro N.M..2006.A Study of the SeismicNoise from its Long-range Correlation Properties[J].Journal of Geophysical Research,111(B10):doi:10.1029/2005jb004237.
    Wapenaar K.,Thorbecke J.,Draganov D..2004.Relations between Reflection and Transmission Responses of Three-dimensional Inhomogeneous Media[J].Geophysical Journal International,156(2):179-194.doi:10.1111/j.1365-246X.2003.02152.x.
    Weaver R.,Lobkis O..2001.Ultrasonics without a Source:Thermal Fluctuation Correlations at MHz Frequencies[J].Physical Review Letters,87(13):doi:10.1103/PhysRev Lett.87.134301.
    Yang Y.,Ritzwoller M.H.,Levshin A.L.,et al..2007.Ambient NoiseRayleigh Wave Tomography Across Europe[J].Geophysical JournalInternational,168(1):259-274.doi:10.1111/j.1365-246X.2006.03203.x.
    Yang Y.,Ritzwoller M.H..2008.Characteristics of Ambient SeismicNoise as a Source for Surface Wave Tomography[J].GeochemistryGeophysics Geosystems,9(2):doi:10.1029/2007GC001814.
    Yao H.,Van Der Hilst R.D.,De Hoop M.V..2006.Surface-wave ArrayTomography in SE Tibet from Ambient Seismic Noise and two-stationAnalysis-I.Phase Velocity Maps[J].Geophysical Journal International,166(2):732-744.
    Zheng S.,Sun X.,Song X.,et al..2008.Surface Wave Tomography ofChina from Ambient Seismic Noise Correlation[J].Geochemistry,Geophysics,Geosystems,9(5):doi:10.1029/2008GC001981.
    Zheng Y.,Yang Y.,Ritzwoller M.H.,et al..2010.Crustal Structure ofthe Northeastern Tibetan Plateau,the Ordos block and the Sichuanbasin from Ambient Noise Tomography[J].Earthquake Science,23(5):465-476.

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