中国大陆东部地区及朝鲜半岛上地幔深部间断面和各向异性
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摘要
使用中国国家地震台网、区域内美国IRIS台站和日本OHP台站,收集到超过三年的震级大于6级的全球范围内的宽频带地震资料,采用接收函数和SKS分裂分析技术,研究了中国大陆东部地区及朝鲜半岛上地幔深部间断面和各向异性。在中国东北地区、华北地区及朝鲜半岛下方,存在大范围的更浅的"410km"间断面和更深的"660km"间断面,该特征与太平洋滞留板块的作用密切相关。区域内的上地幔各向异性主要由上地幔流引起,该地幔流与欧亚板块和太平洋板块相对运动有关,而SKS快轴方向的空间分布揭示了这种复杂的运动模式.
This paper studies seismic discontinuities and seismic anisotropy in the upper mantle beneath eastern Chinese continent and Korean peninsula by receiver functions and SKS splitting techniques.It uses broadband seismic data of earthquakes magnitude larger than 6.0 recorded by seismic stations operated by National Seismic Network of China,Incorporated Research Institutions for Seismology and Ocean Hemisphere Project Network of Japan for more than three years.In Northeast China,North China and Korean Peninsula,there are large zones of shallower "410km" discontinuities and deeper "660km" discontinuities,which are related with Pacific stagnant slab.Seismic anisotropy in this zone originates from upper mantle flow,which is related with relative movement between Eurasia plate and Pacific plate.Spatial distribution of fast axes of SKS phases indicates this complicated movement pattern.
This paper studies seismic discontinuities and seismic anisotropy in the upper mantle beneath eastern Chinese continent and Korean peninsula by receiver functions and SKS splitting techniques.It uses broadband seismic data of earthquakes magnitude larger than 6.0 recorded by seismic stations operated by National Seismic Network of China,Incorporated Research Institutions for Seismology and Ocean Hemisphere Project Network of Japan for more than three years.In Northeast China,North China and Korean Peninsula,there are large zones of shallower "410km" discontinuities and deeper "660km" discontinuities,which are related with Pacific stagnant slab.Seismic anisotropy in this zone originates from upper mantle flow,which is related with relative movement between Eurasia plate and Pacific plate.Spatial distribution of fast axes of SKS phases indicates this complicated movement pattern.
引文
[1]FLANAGAN M,SHEARER P.Global mapping of topography on transition zone velocity discontinuities by stacking SS precursors[J].JGeophys Res,1998,103:2673-2692.
[2]高原,周蕙兰.用数字地震资料探测上地幔深部间断面的研究[J].地球科学进展,1998,13(1):34-37.
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[4]OWENS T J,ZANDT G,TAYLOR S R.Seismic evidence for an ancient rift beneath the cumberland plateau,Tennessee:A detailed analysisof broadband teleseismic P wave[J].J Geophys Res,1984,20(1):180-185.
[5]AI Y,ZHENG T,XU W,HE Y,DONG D.A complex 660km discontinuity beneath northeast China[J].Earth Planet Sci Lett,2003,212:63,71.
[6]AI Y,ZHENG T.The upper mantle discontinuity structure beneath eastern China[J].Geophys Res Lett,2003,30(21):2089,doi:10.1029/2003GL017678.
[7]吴庆举,曾融生,赵文津.2004.喜马拉雅-青藏高原的上地幔倾斜构造与陆-陆碰撞过程[J].中国科学,34(10):919-925.
[8]GAO Y,SUETSUGU D,FUKAO Y,OBAYASHI M,SHI Y,LIU R.Seismic discontinuities in the mantle transition zone and at the top ofthe lower mantle beneath eastern China and Korea:Influence of the stagnant Pacific slab[J].Phys Earth Planet Inter,2010,183(1):288-295.
[9]滕吉文,张中杰,王光杰,张秉铭,王铁男.地球内部各圈层介质的地震各向异性与地球动力学[J].地球物理学进展,2000,15(1):1-35.
[10]张中杰.地震各向异性研究进展[J].地球物理学进展,2002,17(2):281-293.
[11]高原,滕吉文.中国大陆地壳与上地幔地震各向异性研究[J].地球物理学进展,2005,20(1):180-185.
[12]郑斯华,高原.中国大陆岩石层的方位各向异性[J].地震学报,1994,15(2)∶131-140.
[13]高原.利用剪切波分裂研究地壳介质各向异性[J].安徽师范大学学报:自然科学版,2006,29(3):205-211.
[14]VINNIK L P,FARRA V,ROMANOWICZ B.Azimuthal anisotropy in the earth from observation of SKS at GEOSCOPE and NARSbroadband stations[J].Bull Seism Soc Amer,1989,79:1542-1558.
[15]SILVER P G,CHAN W W.Shear－wave splitting and subcontinental mantle deformation[J].J Geophys Res,1991,96(16):429-454.
[16]LIU K H,GAO S S,GAO Y,WU J.Shear－wave splitting and mantle flow associated with the deflected Pacific slab beneath northeast Asia[J].J Geophys Res,2008,113:1305.
[17]RITSEMA J,van HEIJST H J.Seismic imaging of structural heterogeneity in Earth’s mantle:evidence for large－scale mantle flow[J].SciProg,2000,83:243-259.
[18]GURROLA H,MINSTER J B,OWENS T.The use of velocity spectrum for stacking receiver functions and imaging upper mantlediscontinuities[J].Geophys J Int,1994,117:427-440.
[19]SAITA T,SUETSUGU D,OHTAKI T,TAKENAKA H,KANJO K,PURWANA I.Transition zone thickness beneath Indonesia asinferred using the receiver function method for data from the JISNET regional broadband seismic network[J].Geophys Res Lett,2002,29(7):1115.
[20]SUETSUGU D,SHINOHARA M,ARAKI E,KANAZAWA T,SUYEHIRO K,YAMADA T,NAKAHIGASHI K,SHIOBARA H,SUGIOKA H,KAWAI K,FUKAO Y.Mantle discontinuity depths beneath the West Philippine Basin from receiver function analysis ofdeep－sea borehole and seafloor broadband waveforms[J].Bull Seism Soc Am,2005,95:1947-1956.
[21]EFRON B,TIBSHIRANI R.Bootstrap methods for standard errors,confidence intervals,and other measures of statistical accuracy[J].StatSci,1986,1:54-77.
[22]FUKAO Y,WIDIYANTORO S,OBAYASHI M.Stagnant slabs in the upper and lower mantle transition region[J].Rev Geophys,2001,39:291-323.
[23]高原,吴晶,易桂喜,石玉涛.从壳幔地震各向异性初探华北地区壳幔耦合关系[J].科学通报,2010,55(29):2837-2843.
[2]高原,周蕙兰.用数字地震资料探测上地幔深部间断面的研究[J].地球科学进展,1998,13(1):34-37.
[3]LANGSTON C A.Structure under mount rainer,washington,inferred from teleseismic body waves[J].J Geophys Res,1979,84(B9):4749-4762.
[4]OWENS T J,ZANDT G,TAYLOR S R.Seismic evidence for an ancient rift beneath the cumberland plateau,Tennessee:A detailed analysisof broadband teleseismic P wave[J].J Geophys Res,1984,20(1):180-185.
[5]AI Y,ZHENG T,XU W,HE Y,DONG D.A complex 660km discontinuity beneath northeast China[J].Earth Planet Sci Lett,2003,212:63,71.
[6]AI Y,ZHENG T.The upper mantle discontinuity structure beneath eastern China[J].Geophys Res Lett,2003,30(21):2089,doi:10.1029/2003GL017678.
[7]吴庆举,曾融生,赵文津.2004.喜马拉雅-青藏高原的上地幔倾斜构造与陆-陆碰撞过程[J].中国科学,34(10):919-925.
[8]GAO Y,SUETSUGU D,FUKAO Y,OBAYASHI M,SHI Y,LIU R.Seismic discontinuities in the mantle transition zone and at the top ofthe lower mantle beneath eastern China and Korea:Influence of the stagnant Pacific slab[J].Phys Earth Planet Inter,2010,183(1):288-295.
[9]滕吉文,张中杰,王光杰,张秉铭,王铁男.地球内部各圈层介质的地震各向异性与地球动力学[J].地球物理学进展,2000,15(1):1-35.
[10]张中杰.地震各向异性研究进展[J].地球物理学进展,2002,17(2):281-293.
[11]高原,滕吉文.中国大陆地壳与上地幔地震各向异性研究[J].地球物理学进展,2005,20(1):180-185.
[12]郑斯华,高原.中国大陆岩石层的方位各向异性[J].地震学报,1994,15(2)∶131-140.
[13]高原.利用剪切波分裂研究地壳介质各向异性[J].安徽师范大学学报:自然科学版,2006,29(3):205-211.
[14]VINNIK L P,FARRA V,ROMANOWICZ B.Azimuthal anisotropy in the earth from observation of SKS at GEOSCOPE and NARSbroadband stations[J].Bull Seism Soc Amer,1989,79:1542-1558.
[15]SILVER P G,CHAN W W.Shear－wave splitting and subcontinental mantle deformation[J].J Geophys Res,1991,96(16):429-454.
[16]LIU K H,GAO S S,GAO Y,WU J.Shear－wave splitting and mantle flow associated with the deflected Pacific slab beneath northeast Asia[J].J Geophys Res,2008,113:1305.
[17]RITSEMA J,van HEIJST H J.Seismic imaging of structural heterogeneity in Earth’s mantle:evidence for large－scale mantle flow[J].SciProg,2000,83:243-259.
[18]GURROLA H,MINSTER J B,OWENS T.The use of velocity spectrum for stacking receiver functions and imaging upper mantlediscontinuities[J].Geophys J Int,1994,117:427-440.
[19]SAITA T,SUETSUGU D,OHTAKI T,TAKENAKA H,KANJO K,PURWANA I.Transition zone thickness beneath Indonesia asinferred using the receiver function method for data from the JISNET regional broadband seismic network[J].Geophys Res Lett,2002,29(7):1115.
[20]SUETSUGU D,SHINOHARA M,ARAKI E,KANAZAWA T,SUYEHIRO K,YAMADA T,NAKAHIGASHI K,SHIOBARA H,SUGIOKA H,KAWAI K,FUKAO Y.Mantle discontinuity depths beneath the West Philippine Basin from receiver function analysis ofdeep－sea borehole and seafloor broadband waveforms[J].Bull Seism Soc Am,2005,95:1947-1956.
[21]EFRON B,TIBSHIRANI R.Bootstrap methods for standard errors,confidence intervals,and other measures of statistical accuracy[J].StatSci,1986,1:54-77.
[22]FUKAO Y,WIDIYANTORO S,OBAYASHI M.Stagnant slabs in the upper and lower mantle transition region[J].Rev Geophys,2001,39:291-323.
[23]高原,吴晶,易桂喜,石玉涛.从壳幔地震各向异性初探华北地区壳幔耦合关系[J].科学通报,2010,55(29):2837-2843.
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