接收函数的克希霍夫2D偏移方法
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摘要
本文将地震反射资料成像的Kirchhoff偏移方法引入到接收函数成像研究,提出了一种接收函数的Kirchhoff偏移方法,以适应介质速度的横向变化,提高接收函数成像的精度和分辨率.模型检验表明,与传统的水平分层的共转换点偏移叠加方法相比,Kirchhoff偏移方法能够实现转换波的有效归位,消除水平分层共转换点偏移叠加造成的假象.一个很重要的现象是,倾斜或弯曲界面的成像明显受控于远震的入射方向,其成像精度的提高有赖于不同方向接收函数的联合成像.
We extend seismic reflection Kirchhoff migration to receiver function study, to adapt to lateral velocity variation and improve the precision and resolution of receiver function migration. The model experiment shows that Kirchhoff migration can implement effective image of converted phases, remove the fictious image, in contrast to ray-based horizontal common-converted-point stacking method. We note that imaging dipping or curving interface is controlled by teleseismic azimuth, and receiver functions from different direction should be jointed to better resolve those complicated structures.
We extend seismic reflection Kirchhoff migration to receiver function study, to adapt to lateral velocity variation and improve the precision and resolution of receiver function migration. The model experiment shows that Kirchhoff migration can implement effective image of converted phases, remove the fictious image, in contrast to ray-based horizontal common-converted-point stacking method. We note that imaging dipping or curving interface is controlled by teleseismic azimuth, and receiver functions from different direction should be jointed to better resolve those complicated structures.
引文
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[12]吴庆举,曾融生,赵文津.喜马拉雅—青藏高原的上地幔倾斜构造与陆—陆碰撞过程.中国科学(D),2004,34(10):919~925Wu QJ,Zeng R S,Zhao WJ.The upper mantle structure of the Tibetan Plateau and its implication for the continent-continent collision.Science in China(Series D),2005,48(8):1158~1164
[13]Ai Yinshuang,Zheng Tianyu,Xu Weiwei,et al.Acomplex660km discontinuity beneath northeast China.Earth and Planet.Sci.Lett.,2003,212:63~71
[14]Ai Yinshuang,Zheng Tianyu.The upper mantle discontinuitystructure beneath eastern China.Geophys.Res.Lett.,2003,30(21):2089,doi:10.1029/2003GL017678
[15]Ai Y S,Zhao D P,Gao X,et al.The crust and upper mantle discontinuity structure beneath Alaska inferred from receiver functions.Phys.Earth Planet.Inter.,2005,150:339~350
[16]Tian X B,Wu QJ,Zhang Z J,et al.Joint imaging by teleseismic converted and multiple waves andits applicationinthe INDEPTH-III passive seismic array.Geophys.Res.Lett.,2005,32:L2131510.1029
[17]Yilmaz O.Seismic Data Processing.Society of Exploration Geophysicists,Tulsa,1987
[18]Claerbout J F,Doherty S M.Downward continuation of moveout corrected seismograms.Geophysics,1972,37(5):741~768
[19]Dueker K D,Sheehan A F.Mantle discontinuity structure from midpoint stacks of converted P to S wave across the Yellow-stone hotspot tracks.J.Geophys.Res.1997,102(8):313~327
[20]Ryberg T,Weber M.Receiver function arrays:a reflection seismic approach.Geophys.J.Int.2000,141:1~11
[21]Bostock M G,Rondenay S.Migration of scattered teleseismic body waves.Geophys.J.Int.,1999,137:732~756
[22]Wu R,Aki K.Scattering characteristics of elastic waves and elastic heterogeneity.Geophysics,1985,50:582~595
[2]刘启元,Rainer K,李顺成.接收函数复谱比的最大或然性估计及非线性反演.地球物理学报,1996,39(4):502~511Liu Q Y,Rainer K,Li S C.Maximal likelihood estimation and nonlinear inversion of the complex receiver function spectrumratio.Chinese J.Geophys.(in Chinese),1996,39(4):502~511
[3]刘启元,Rainer K,李顺成.中国数字地震台网的接收函数及其非线性反演.地球物理学报,1997,40(3):356~368Liu QY,Rainer K,Li S C.The receiver functions at the stations of the Chinese digital seismic network(CDSN)and their nonlinear inversion.Chinese J.Geophys.(in Chinese),1997,40(3):356~368
[4]刘启元,李顺成,沈扬等.延怀盆地及其邻区地壳上地幔速度结构的宽频带地震台阵研究.地球物理学报,1997,40(6):763~773Liu QY,Li S C,Shen Y,et al.Broadband seismic array study of the crust and upper mantle velocity structure beneath Yanhuai basin and its neighbouring region.Chinese J.Geophys.(in Chinese),1997,40(6):763~773
[5]刘启元,陈九辉,李顺成等.新疆伽师强震群区三维地壳上地幔S波速度结构及其地震成因的探讨.地球物理学报,2000,43(5):356~365Liu QY,Chen J H,Li S C,et al.Passive seismic experiment in Xinjiang-Jiashi strong earthquake region and discussion onits seismic genesis.Chinese J.Geophys.(in Chinese),2000,43(5):356~365
[6]刘启元,Rainer Kind,陈九辉等.大别造山带壳幔界面的断错结构和壳内低速体.中国科学(D),2005,35(4):304~313Liu QY,Rainer Kind,ChenJ H,et al.Dislocationstructure of the crust-mantle boundary andlow-velocity body withinthe crust beneath the Dabie Shan collision orogen.Science in China(Series D),2005,48(7):875~885
[7]吴庆举,曾融生.用宽频带远震接收函数研究青藏高原的地壳结构.地球物理学报,1998,41(5):669~679Wu QJ,Zeng RS.The crustal structure of Qinghai-Xizang plateau inferredfrombroadbandteleseismic waveform.Chinese J.Geophys.(in Chinese),1998,41(5):669~679
[8]Zhu L P,Kanamori H.Moho depth variation in southern California fromteleseismic receiver functions.J.Geophys.Res.,2000,105:2969~2980
[9]Zhu L P,Owens T J,Randall G E.Lateral variation in crustal structure of the Northern Tibetan Plateau inferred fromteleseismic receiver functions.Bull.Seismol.Soc.Am.,1995,85(6):1531~1540
[10]Levin V,Park J.Crustal anisotropy beneath the Ural mtns foredeep fromteleseismic receiver functions.Geophys.Res.Lett.,1997,24:1283~1286
[11]Zhu L P.Crustal structure across the San Andreas Fault.Southern California fromteleseismic converted waves.Earth and Planetary Sci.Lett.,2000,179:183~190
[12]吴庆举,曾融生,赵文津.喜马拉雅—青藏高原的上地幔倾斜构造与陆—陆碰撞过程.中国科学(D),2004,34(10):919~925Wu QJ,Zeng R S,Zhao WJ.The upper mantle structure of the Tibetan Plateau and its implication for the continent-continent collision.Science in China(Series D),2005,48(8):1158~1164
[13]Ai Yinshuang,Zheng Tianyu,Xu Weiwei,et al.Acomplex660km discontinuity beneath northeast China.Earth and Planet.Sci.Lett.,2003,212:63~71
[14]Ai Yinshuang,Zheng Tianyu.The upper mantle discontinuitystructure beneath eastern China.Geophys.Res.Lett.,2003,30(21):2089,doi:10.1029/2003GL017678
[15]Ai Y S,Zhao D P,Gao X,et al.The crust and upper mantle discontinuity structure beneath Alaska inferred from receiver functions.Phys.Earth Planet.Inter.,2005,150:339~350
[16]Tian X B,Wu QJ,Zhang Z J,et al.Joint imaging by teleseismic converted and multiple waves andits applicationinthe INDEPTH-III passive seismic array.Geophys.Res.Lett.,2005,32:L2131510.1029
[17]Yilmaz O.Seismic Data Processing.Society of Exploration Geophysicists,Tulsa,1987
[18]Claerbout J F,Doherty S M.Downward continuation of moveout corrected seismograms.Geophysics,1972,37(5):741~768
[19]Dueker K D,Sheehan A F.Mantle discontinuity structure from midpoint stacks of converted P to S wave across the Yellow-stone hotspot tracks.J.Geophys.Res.1997,102(8):313~327
[20]Ryberg T,Weber M.Receiver function arrays:a reflection seismic approach.Geophys.J.Int.2000,141:1~11
[21]Bostock M G,Rondenay S.Migration of scattered teleseismic body waves.Geophys.J.Int.,1999,137:732~756
[22]Wu R,Aki K.Scattering characteristics of elastic waves and elastic heterogeneity.Geophysics,1985,50:582~595
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