利用多重滤波方法提取面波频散曲线
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摘要
多重滤波方法已被证明在分析面波的频散特性时是一种有效而快速的方法。本文用单个台站的单次地震事件记录,应用MFT(Multiple Filter Technique)方法提取了内华达地区的面波频散曲线并分析了其特征,认为其具有大陆基振型瑞利波频散曲线的典型特征。还利用广义反透射系数法快速计算了瑞利面波频散曲线,尤其是基阶瑞利波相速度及群速度频散曲线;并且在由振型叠加方法合成的理论地震图的基础上,通过比较理论频散曲线和MFT方法得到的频散曲线,研究了多重滤波的可靠性。
Multiple filter analysis method(MFT) has been proved efficient for computing the dispersion curve of surface wave.In the article,with the data of earthquake event in Nevada area recorded by single station,MFT is used to derive the dispersion curve of Nevada area,and its characteristic are deeply analyzed.The result shows that the dispersion curves in Nevada area own the character of the dispersion curves of the typical mainland fundamental Rayleigh mode.Furthermore,theoretical dispersion curve of Rayleigh wave is calculated by generalized reflection-transmission method,and the phase velocity curve and group velocity curve of the fundamental Rayleigh mode are compared with that derived from the synthetic seismogram calculated by the modal sunnation method with MFT.Two results coincide better in the interested frequency range,showing MFT is reliable.
Multiple filter analysis method(MFT) has been proved efficient for computing the dispersion curve of surface wave.In the article,with the data of earthquake event in Nevada area recorded by single station,MFT is used to derive the dispersion curve of Nevada area,and its characteristic are deeply analyzed.The result shows that the dispersion curves in Nevada area own the character of the dispersion curves of the typical mainland fundamental Rayleigh mode.Furthermore,theoretical dispersion curve of Rayleigh wave is calculated by generalized reflection-transmission method,and the phase velocity curve and group velocity curve of the fundamental Rayleigh mode are compared with that derived from the synthetic seismogram calculated by the modal sunnation method with MFT.Two results coincide better in the interested frequency range,showing MFT is reliable.
引文
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[5]Mitchell B.Radiation and Attenuation Of Rayleigh Waves FromtheSoutheastern Missouri Earthquake Of October 21,1965[J].J.Geo-phys.Res.,1973,78(5):886-899.
[6]Herrmann R B.Some Aspects Of Band-pass Filtering Of SurfaceWaves[J].Bull.Seism.Soc.Am.,1973,63:663-671.
[7]Cakir O,M Erduran.Effect Of Earth Structure And Source TimeFunction On Inversion Of Single-Station Regional Surface WavesFor Rupture Mechanism And Focal Depth[J].Journal of the Bal-kan Geophysical Society.2000,2:20-36.
[8]Ryaboy V Douglas,R Baumgardt,Petr Firbas,et al..Applicationof 3-D Crustal and Upper Mantle Velocity Model of North Americafor Location of Regional Seismic Events[J].Pure appl.Geophys.,2001,158:79-103.
[2]Sayil N,I Osmansahin.Investigation of Crust and Upper-MantleStructure in the Black Sea with Group-Velocity data[J].Bull.Seism.Soc.Am.,2000,90(1):870-875.
[3]曾融生.固体地球物理学[M].北京:科学出版社,1984.
[4]Dziewonski A,S Bloch,MLandisman.A Technique For the Tran-sient Seismic Signals[J].Bull.Seism.Soc.Am.,1969,59(1):427-444.
[5]Mitchell B.Radiation and Attenuation Of Rayleigh Waves FromtheSoutheastern Missouri Earthquake Of October 21,1965[J].J.Geo-phys.Res.,1973,78(5):886-899.
[6]Herrmann R B.Some Aspects Of Band-pass Filtering Of SurfaceWaves[J].Bull.Seism.Soc.Am.,1973,63:663-671.
[7]Cakir O,M Erduran.Effect Of Earth Structure And Source TimeFunction On Inversion Of Single-Station Regional Surface WavesFor Rupture Mechanism And Focal Depth[J].Journal of the Bal-kan Geophysical Society.2000,2:20-36.
[8]Ryaboy V Douglas,R Baumgardt,Petr Firbas,et al..Applicationof 3-D Crustal and Upper Mantle Velocity Model of North Americafor Location of Regional Seismic Events[J].Pure appl.Geophys.,2001,158:79-103.
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