利用莫霍面Ps震相研究中国东北地区地壳各向异性
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摘要
利用中国东北地区布设的65套宽频带数字地震仪2009年6月—2011年6月记录的远震事件,用时间域最大熵谱反褶积方法提取接收函数,并用改进的剪切波分裂分析方法对该区地壳介质各向异性参数进行研究,获得了该区地壳介质各向异性图像.结果表明,该区地壳介质各向异性快波偏振方向大致为北西向,快慢波时间延迟在0.15—0.3s之间;但有7个台站下方地壳各向异性快波方向表现为北东向,可能与当地复杂构造有关.该区地壳各向异性快波偏振方向与主压应力场方向近乎垂直,与板块移动方向基本一致,与SKS/SKKS各向异性快波方向也基本一致.推断本研究区地壳介质各向异性反映了该区的主张应力方向,且主要各向异性来源于中下地壳,暗示了壳-幔垂直变形的一致性.
Using teleseismic events recorded by 65 broad-band digital seismic stations during June 2009 to June 2011 in Northeast China,we calculated receiver functions by conducting maximum entropy deconvolution in time domain,and obtained the crustal anisotropy parameters by using the improved shearwave splitting analysis.The result shows that in Northeast China,the dominant direction of fast wave polarity is approximately in NW--SE in this region,and the time delay between the fast and slow waves is 0.15—0.3 seconds.But the fast wave polarity direction is in NE--SW beneath other 7 stations,possibly due to the effect of local complex structure.Through a comparison study we find that the polarization direction of the fast wave is nearly perpendicular to the direction of principal compressive stress,and is approximately the same as the direction of the Eurasian plate movement and the result of SKS/SKKS analysis.It can be concluded that our result has revealed the tensile stress and the anisotropy may come from the middle and lower part of the crust in this region.
Using teleseismic events recorded by 65 broad-band digital seismic stations during June 2009 to June 2011 in Northeast China,we calculated receiver functions by conducting maximum entropy deconvolution in time domain,and obtained the crustal anisotropy parameters by using the improved shearwave splitting analysis.The result shows that in Northeast China,the dominant direction of fast wave polarity is approximately in NW--SE in this region,and the time delay between the fast and slow waves is 0.15—0.3 seconds.But the fast wave polarity direction is in NE--SW beneath other 7 stations,possibly due to the effect of local complex structure.Through a comparison study we find that the polarization direction of the fast wave is nearly perpendicular to the direction of principal compressive stress,and is approximately the same as the direction of the Eurasian plate movement and the result of SKS/SKKS analysis.It can be concluded that our result has revealed the tensile stress and the anisotropy may come from the middle and lower part of the crust in this region.
引文
常利军,王椿镛,丁志峰.2009.中国东部上地幔各向异性研究[J].中国科学:D辑,39(9):1169--1178.
冯强强,吴庆举,李永华,潘佳铁,张风雪,张广成,余大新.2012.新疆地区S波分裂研究[J].地震学报,34(3):1--12.
高原,滕吉文.2005.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,20(1):180--185.
高原,郑斯华,孙勇.1995.唐山地区地壳裂隙各向异性[J].地震学报,17(3):283--293.
高原,郑斯华,周蕙兰.1999.唐山地区快剪切波偏振图像及其变化[J].地球物理学报,42(2):228--232.
胡新康,王倩,马青,杜雪松.2007.区域无整体旋转基准的研究与应用[J].大地测量与地球动力学,27(2):52--60.
罗艳,黄忠贤,彭艳菊,郑月军.2004.中国大陆及邻区SKS波分裂研究[J].地球物理学报,47(5):812--821.
彭艳菊,黄忠贤,苏伟,郑月军.2007.中国大陆及临区海域地壳上地幔各向异性研究[J].地球物理学报,50(3):752--759.
石玉涛,高原,吴晶,罗艳,苏有锦.2006.云南地区介质各向异性-快剪切波偏振特性的初步研究[J].地震学报,28(6):574--585.
太龄雪,高原,马国凤,李恩慈,石玉涛,林欣儀.2011.用剪切波分裂研究台湾北部地壳各向异性[J].地球物理学报,54(9):2233--2242.
田宝峰,李娟,姚振兴.2008.利用接收函数方位变化研究太行山区各向异性[J].地震学报,30(4):355--366.
王良书,陈运平,米宁,刘绍文,李成,徐鸣吉,李华.2005.从地震波各向异性到各向异性地震学:地震波各向异性研究综述[J].高校地质学报,12(11):544--551.
吴晶,高原,陈运泰,黄金莉.2007.首都圈西北部地区地壳介质地震各向异性特征初步研究[J].地球物理学报,50(1):209--220.
吴庆举,田小波,张乃玲,李卫平,曾融生.2003.计算台站接收函数的最大熵谱反褶积方法[J].地震学报,25(4):382--389.
谢富仁,崔效锋,赵建涛,陈群策,李宏.2004.中国大陆及邻区现代构造应力场分区[J].地球物理学报,47(4):654--662.
姚立珣,汪进,李亚荣.1992.用震源机制解确定东北地区地壳应力场[J].东北地震研究,8(2):27--32.
张智,田小波.2011.青藏高原中部地壳和上地幔各向异性分析[J].地球物理学报,54(11):2761--2768.
张中杰,滕吉文,贺振华.1999.EDA介质中地震波速度、衰减与品质因子方位异性研究[J].中国科学:E辑,29(6):569--574.
中国地震局地壳应力研究所.2004.中国陆地壳应力环境基础数据库[DB/OL].[2012-01-15].http:∥www.eq-icd.cn/webgis/picture.htm.
Crampin S.1981.A review of wave motion in anisotropic and dracked elastic-media[J].Wave Motion,3(4):343--391.
Davis J C.1986.Statistics and Data Analysis in Geology[M].Second Edition.John Wiley&Sons,Inc.USA:316--326.
Fouch M J,Fischer K M.1996.Mantle anisotropy beneath southwest Pacific subduction zones[J].J Geophys Res,101(B7):15987--16002.
Gao S,Davis P M,Liu H,Slack P D,Zorin Yu A,Mordvinova V V,Kozhevnikov V M,Meyer R P.1994.Seismic anisotropy and mantle flow beneath the Baikal rift zone[J].Nature,371(8):149--151.
Gripp A E,Gordon R G.2002.Young tracks of hotspots and current plate velocities[J].Geophys J Int,150(2):321--361.
Heidbach O,Tingay M,Barth A,Reinecher J,Kurfe B D,Muller B.2008.World Stress Map release 2008[DB/OL].[2012-01-15].http:∥www.world-stress-map.org.
Li J,Niu F L.2010.Seismic anisotropy and mantle flow beneath northeast China inferred from regional seismic networks[J].J Geophys Res,115(B12):B12327,doi:10.1029/2010JB007470.
Liu K,Zhang Z J,Hu J F,Teng J W.2001.Frequency band-dependence of S-wave splitting in China mainland and its implications[J].Sci China Earth Sci,44(7):659--665.
Liu K H,Gao S S,Gao Y,Wu J.2008a.Shear wave splitting and mantle flow associated with the deflected Pacific slab beneath northeast Asia[J].J Geophys Res,113(B1):B01305,doi:10.1029/2007JB005178.
Liu Y,Zhang H,Thurber C,Roecker S.2008b.Shear wave anisotropy in the crust around the San Andreas fault near Park field:Spatial and temporal analysis[J].Geophys J Int,172(3):957--970.
McNamara D E,Owens T J.1993.Azimuthal shear wave velocity anisotropy in the basin and range province using Moho Ps converted phase[J].J Geophys Res,98(B7):12003--12017.
McNamara D E,Owens T J,Silver P G,Wu F T.1994.Shear wave anisotropy beneath the Tibetan Plateau[J].J Geophys Res,99(B7):13655--13665.
Sadidkhouy A,Javan,Doloei G,Gheitanchi M R.2006.Crustal seismic anisotropy in the south-central Alborz region using Moho Ps converted phases[J].J Geophys Res-Space,32(3):23--32.
Sadidkhouy A,Javan,Doloei G,Siahkoohi H R.2008.Seismic anisotropy in the crust and upper mantle of the Central Alborz Region-Iran[J].Tectonophysics,456(3--4):194--205.
Schmid C,Lee S V D,Giardini D.2004.Delay time and shear wave splitting in the Mediterranean region[J].Geophys J Int,159(1):275--290.
Sliver P G,Chan W W J.1991.Shear-wave splitting and subcontinental mantle deformation[J].J Geophys Res,96(B10):16429--16454.
Teanby N A,Kendall J M,Van der Baan M.2004.Automation of shear-wave splitting measurements using cluster analysis[J].Bull Seism Soc Amer,94(2):453--463.
Vinnik L P,Makeyeva L I,Milev A,Usenko Yu.1992.Global patterns of azimuthal anisotropy and deformations in the continental mantle[J].Geophys J Int,111(3):433--447.
Wustefeld A,Bokelmann G G R,Barruol G,Montagner J P.2009.Identifying global seismic anisotropy patterns by correlating shear-wave splitting and surface waves data[J].Phys Earth Planet Int,176(3--4):198--212.
Zhang Z J,Teng J W,Badal J,Liu E R.2009.Constructions of regional and local seismic anisotropic structures from wide-angle seismic data:crustal deformation in the southeast of China[J].J Seismol,13(2):241--252.
冯强强,吴庆举,李永华,潘佳铁,张风雪,张广成,余大新.2012.新疆地区S波分裂研究[J].地震学报,34(3):1--12.
高原,滕吉文.2005.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,20(1):180--185.
高原,郑斯华,孙勇.1995.唐山地区地壳裂隙各向异性[J].地震学报,17(3):283--293.
高原,郑斯华,周蕙兰.1999.唐山地区快剪切波偏振图像及其变化[J].地球物理学报,42(2):228--232.
胡新康,王倩,马青,杜雪松.2007.区域无整体旋转基准的研究与应用[J].大地测量与地球动力学,27(2):52--60.
罗艳,黄忠贤,彭艳菊,郑月军.2004.中国大陆及邻区SKS波分裂研究[J].地球物理学报,47(5):812--821.
彭艳菊,黄忠贤,苏伟,郑月军.2007.中国大陆及临区海域地壳上地幔各向异性研究[J].地球物理学报,50(3):752--759.
石玉涛,高原,吴晶,罗艳,苏有锦.2006.云南地区介质各向异性-快剪切波偏振特性的初步研究[J].地震学报,28(6):574--585.
太龄雪,高原,马国凤,李恩慈,石玉涛,林欣儀.2011.用剪切波分裂研究台湾北部地壳各向异性[J].地球物理学报,54(9):2233--2242.
田宝峰,李娟,姚振兴.2008.利用接收函数方位变化研究太行山区各向异性[J].地震学报,30(4):355--366.
王良书,陈运平,米宁,刘绍文,李成,徐鸣吉,李华.2005.从地震波各向异性到各向异性地震学:地震波各向异性研究综述[J].高校地质学报,12(11):544--551.
吴晶,高原,陈运泰,黄金莉.2007.首都圈西北部地区地壳介质地震各向异性特征初步研究[J].地球物理学报,50(1):209--220.
吴庆举,田小波,张乃玲,李卫平,曾融生.2003.计算台站接收函数的最大熵谱反褶积方法[J].地震学报,25(4):382--389.
谢富仁,崔效锋,赵建涛,陈群策,李宏.2004.中国大陆及邻区现代构造应力场分区[J].地球物理学报,47(4):654--662.
姚立珣,汪进,李亚荣.1992.用震源机制解确定东北地区地壳应力场[J].东北地震研究,8(2):27--32.
张智,田小波.2011.青藏高原中部地壳和上地幔各向异性分析[J].地球物理学报,54(11):2761--2768.
张中杰,滕吉文,贺振华.1999.EDA介质中地震波速度、衰减与品质因子方位异性研究[J].中国科学:E辑,29(6):569--574.
中国地震局地壳应力研究所.2004.中国陆地壳应力环境基础数据库[DB/OL].[2012-01-15].http:∥www.eq-icd.cn/webgis/picture.htm.
Crampin S.1981.A review of wave motion in anisotropic and dracked elastic-media[J].Wave Motion,3(4):343--391.
Davis J C.1986.Statistics and Data Analysis in Geology[M].Second Edition.John Wiley&Sons,Inc.USA:316--326.
Fouch M J,Fischer K M.1996.Mantle anisotropy beneath southwest Pacific subduction zones[J].J Geophys Res,101(B7):15987--16002.
Gao S,Davis P M,Liu H,Slack P D,Zorin Yu A,Mordvinova V V,Kozhevnikov V M,Meyer R P.1994.Seismic anisotropy and mantle flow beneath the Baikal rift zone[J].Nature,371(8):149--151.
Gripp A E,Gordon R G.2002.Young tracks of hotspots and current plate velocities[J].Geophys J Int,150(2):321--361.
Heidbach O,Tingay M,Barth A,Reinecher J,Kurfe B D,Muller B.2008.World Stress Map release 2008[DB/OL].[2012-01-15].http:∥www.world-stress-map.org.
Li J,Niu F L.2010.Seismic anisotropy and mantle flow beneath northeast China inferred from regional seismic networks[J].J Geophys Res,115(B12):B12327,doi:10.1029/2010JB007470.
Liu K,Zhang Z J,Hu J F,Teng J W.2001.Frequency band-dependence of S-wave splitting in China mainland and its implications[J].Sci China Earth Sci,44(7):659--665.
Liu K H,Gao S S,Gao Y,Wu J.2008a.Shear wave splitting and mantle flow associated with the deflected Pacific slab beneath northeast Asia[J].J Geophys Res,113(B1):B01305,doi:10.1029/2007JB005178.
Liu Y,Zhang H,Thurber C,Roecker S.2008b.Shear wave anisotropy in the crust around the San Andreas fault near Park field:Spatial and temporal analysis[J].Geophys J Int,172(3):957--970.
McNamara D E,Owens T J.1993.Azimuthal shear wave velocity anisotropy in the basin and range province using Moho Ps converted phase[J].J Geophys Res,98(B7):12003--12017.
McNamara D E,Owens T J,Silver P G,Wu F T.1994.Shear wave anisotropy beneath the Tibetan Plateau[J].J Geophys Res,99(B7):13655--13665.
Sadidkhouy A,Javan,Doloei G,Gheitanchi M R.2006.Crustal seismic anisotropy in the south-central Alborz region using Moho Ps converted phases[J].J Geophys Res-Space,32(3):23--32.
Sadidkhouy A,Javan,Doloei G,Siahkoohi H R.2008.Seismic anisotropy in the crust and upper mantle of the Central Alborz Region-Iran[J].Tectonophysics,456(3--4):194--205.
Schmid C,Lee S V D,Giardini D.2004.Delay time and shear wave splitting in the Mediterranean region[J].Geophys J Int,159(1):275--290.
Sliver P G,Chan W W J.1991.Shear-wave splitting and subcontinental mantle deformation[J].J Geophys Res,96(B10):16429--16454.
Teanby N A,Kendall J M,Van der Baan M.2004.Automation of shear-wave splitting measurements using cluster analysis[J].Bull Seism Soc Amer,94(2):453--463.
Vinnik L P,Makeyeva L I,Milev A,Usenko Yu.1992.Global patterns of azimuthal anisotropy and deformations in the continental mantle[J].Geophys J Int,111(3):433--447.
Wustefeld A,Bokelmann G G R,Barruol G,Montagner J P.2009.Identifying global seismic anisotropy patterns by correlating shear-wave splitting and surface waves data[J].Phys Earth Planet Int,176(3--4):198--212.
Zhang Z J,Teng J W,Badal J,Liu E R.2009.Constructions of regional and local seismic anisotropic structures from wide-angle seismic data:crustal deformation in the southeast of China[J].J Seismol,13(2):241--252.
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