山东地区上地幔各向异性研究
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摘要
通过分析山东地区数字地震台网37个宽频带地震台站的远震SKS波形资料,使用最小能量法和旋转相关法求得每一个台站的SKS快波偏振方向和快、慢波时间延迟,获得了山东地区上地幔各向异性图像.该研究区的各向异性快波方向基本呈WNW-ESE方向,快、慢波时间延迟为0.73—1.71s.研究表明,山东地区上地幔存在明显的各向异性,各向异性快波方向与岩石层的伸展方向和GPS测量得到的速度场方向(ITRF2005参考框架下)基本一致.
Based on teleseimic SKS waveform data recorded at 37 broad-band seismic stations in Shandong region,the split SKS fast-wave polarization direction and the delay time between fast and slow wave arrival at each station were determined by using both the minimum energy and waveform rotation-correlation method,and the image of upper mantle anisotropy in Shandong region was acquired.The fast-wave polarization direction in this region is basically WNW--ESE,and the delay time is about 0.73—1.71 s.Our result suggests that the upper mantle anisotropy obviously exists in Shandong region.The fast-wave polarization direction is generally consistent with the direction of lithospheric extension and GPS observed velocity(ITRF2005) vectors.
Based on teleseimic SKS waveform data recorded at 37 broad-band seismic stations in Shandong region,the split SKS fast-wave polarization direction and the delay time between fast and slow wave arrival at each station were determined by using both the minimum energy and waveform rotation-correlation method,and the image of upper mantle anisotropy in Shandong region was acquired.The fast-wave polarization direction in this region is basically WNW--ESE,and the delay time is about 0.73—1.71 s.Our result suggests that the upper mantle anisotropy obviously exists in Shandong region.The fast-wave polarization direction is generally consistent with the direction of lithospheric extension and GPS observed velocity(ITRF2005) vectors.
引文
常利军,王椿镛,丁志峰.2006.云南地区SKS波分裂研究[J].地球物理学报,49(1):197-204.
常利军,王椿镛,丁志峰,周民都,杨建思,徐智强,姜旭东,郑秀芬.2008a.青藏高原东北缘上地幔各向异性研究[J].地球物理学报,51(2):431-438.
常利军,王椿镛,丁志峰.2008b.首都圈地区SKS波分裂研究[J].地震学报,30(6):551-559.
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,39(9):1169-1178.
晁洪太,王錡,李家灵,崔昭文,陈时军.1997.山东省地震构造图、山东省新构造图说明书[M].济南:山东省地图出版社:1-3.
丁志峰,曾融生.1994.青藏高原SKS波各向异性的研究[G]∥陈运泰主编.中国固体地球物理学进展.北京:海洋出版社:162-168.
高原,吴晶.2008.利用剪切波各向异性推断地壳主压应力场:以首都圈地区为例[J].科学通报,53(23):2933-2939.
高原,吴晶,易桂喜,石玉涛.2010.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,55(29):2837-2843.
黄晓葛,白武明.1999.地震各向异性的研究进展[J].地球物理学进展,14(3):54-65.
姜枚,许志琴,Hirn A,刘妍,董英君,薛光琦,钱辉.2001.青藏高原及其部分邻区地震各向异性和上地幔特征[J].地球学报,22(2):111-116.
李白基.1994.昆明地区上地幔地震方位异性[M]∥陈运泰主编.中国固体地球物理学进展.北京:海洋出版社:330-338.
林怀存.1989.山东地区近震地震波速与地壳结构[J].华北地震科学,7(3):82-90.
刘希强,周蕙兰,李红,季爱东.2001.中国大陆及邻区上地幔各向异性研究[J].地震学报,23(4):337-348.
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.中国大陆及邻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.
阮爱国,王椿镛.2001.上地幔各向异性研究综述及在川滇地区的研究思路[J].国际地震动态,(10):1-7.
王椿镛,常利军,吕智勇,秦嘉政,苏伟.2007.青藏高原东部上地幔各向异性及相关的壳幔耦合型式[J].中国科学:D辑,37(4):495-503.
吴晶,高原,陈运泰.2008.首都圈东南部地区地壳介质各向异性[J].地震学报,21(1):1-10.
殷海涛,李杰,张玲,吴晨,董晓娜.2008.基于GPS观测网的山东地区地壳运动特征分析[J].西北地震学报,30(3):276-281.
张中杰.2002.地震各向异性研究进展[J].地球物理学进展,17(2):281-293.
郑斯华,高原.1994.中国大陆岩石层的方位各向异性[J].地震学报,16(2):131-140.
An M,Shi Y.2006.Lithospheric thickness of the Chinese continent[J].Phys Earth Planet Interi,159(3-4):257-266.
Barruol G,Silver P G,Vauchez A.1997.Seismic anisotropy in the eastern US:Deep structure of a complex continentalplate[J].J Geophys Res,102(B4):8329-8348.
Bowman J R,Ando M.1987.Shear-wave splitting in the upper-mantle wedge above the Tonga subduction zone[J].Geo-phys J R Astron Soc,88(1):25-41.
Flesch L M,Holt W E,Silver P G,Stephenson M,Wang C Y,Chan W W.2005.Constraining the extent of crust-man-tle coupling in central Asia using GPS,geologic,and shear wave splitting data[J].Earth Planet Sci Lett,238(1-2):248-268.
Gao S S,Liu K H.2009.Significant seismic anisotropy beneath the southern Lhasa Terrane,Tibetan Plateau[J].Geo-chem Geophys Geosyst,10,Q02008,doi:10.1029/2008GC002227.
Hess H H.1964.Seismic anisotropy of the upper most mantle under oceans[J].Nature,203(9):629-631.
Huang W C,Ni J F,Tilmann F,Nelson D,Guo J R,Zhao W J,Mechie J,Kind R,Saul J,Rapine R,Hearn T M.2000.Seismic polarization anisotropy beneath the central Tibetan Plateau[J].J Geophys Res,105(B12):27,979-27,989.
McNamara D E,Owens T J,Silver P G,Wu F T.1994.Shear wave anisotropy beneath the Tibetan Plateau[J].J Geo-phys Res,99(B7):13655-13665.
Nicolas A,Christensen N I.1987.Formation of anisotropy in upper mantle peridotites:A review,in composition struc-ture and dynamics of the lithosphere-asthenosphere system[J].Geodyn Ser,16:111-123.
Pard J,Levin V.2002.Seismic anisotropy:Tracing plate dynamics in the mantle[J].Science,296(5567):485-489.
Richardson R M.1992.Ridge forces,absolute plate motions,and the intraplate stress field[J].J Geophys Res,97(B8):11739-11748.
Savage M K.1999.Seismic anisotropy and mantle deformation:What have we leamed from shear wave splitting[J].RevGeophys,37(1):65-106.
Silver P G,Chan W W.1991.Shear wave splitting and subcontinental mantle deformation[J].J Geophys Res,96:16429-16454.
Silver P G.1996.Seismic anisotropy beneath the continents:Probing the depths of geology[J].Annu Rev Earth PlanetSci,24:385-432.
Vecsey L,Plomerova J,Babuska V.2008.Shear-wave splitting measurements-Problems and solutions[J].Tectonophys-ics,462(1-4):178-196.
Vinnik L P,Kosarev G L,Makeyeva L I.1984.Anisotropy in the lithosphere from the ovbservations of SKS and SKKS[J].Dok Acad Nauk SSSR,278:1335-1339.
Wüstefeld A,Bokelmann G H R.2007.Null detection in shear-wave splitting measurements[J].Bull Seism Soc Amer,97(4):1204-1211.
Wüstefeld A,Bokelmann G H R,Zaroli C,Barruol G.2008.SplitLab:A shear-wave splitting environment in Matlab[J].Comput Geosci,34(5):515-528.
常利军,王椿镛,丁志峰,周民都,杨建思,徐智强,姜旭东,郑秀芬.2008a.青藏高原东北缘上地幔各向异性研究[J].地球物理学报,51(2):431-438.
常利军,王椿镛,丁志峰.2008b.首都圈地区SKS波分裂研究[J].地震学报,30(6):551-559.
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,39(9):1169-1178.
晁洪太,王錡,李家灵,崔昭文,陈时军.1997.山东省地震构造图、山东省新构造图说明书[M].济南:山东省地图出版社:1-3.
丁志峰,曾融生.1994.青藏高原SKS波各向异性的研究[G]∥陈运泰主编.中国固体地球物理学进展.北京:海洋出版社:162-168.
高原,吴晶.2008.利用剪切波各向异性推断地壳主压应力场:以首都圈地区为例[J].科学通报,53(23):2933-2939.
高原,吴晶,易桂喜,石玉涛.2010.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,55(29):2837-2843.
黄晓葛,白武明.1999.地震各向异性的研究进展[J].地球物理学进展,14(3):54-65.
姜枚,许志琴,Hirn A,刘妍,董英君,薛光琦,钱辉.2001.青藏高原及其部分邻区地震各向异性和上地幔特征[J].地球学报,22(2):111-116.
李白基.1994.昆明地区上地幔地震方位异性[M]∥陈运泰主编.中国固体地球物理学进展.北京:海洋出版社:330-338.
林怀存.1989.山东地区近震地震波速与地壳结构[J].华北地震科学,7(3):82-90.
刘希强,周蕙兰,李红,季爱东.2001.中国大陆及邻区上地幔各向异性研究[J].地震学报,23(4):337-348.
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.中国大陆及邻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.
阮爱国,王椿镛.2001.上地幔各向异性研究综述及在川滇地区的研究思路[J].国际地震动态,(10):1-7.
王椿镛,常利军,吕智勇,秦嘉政,苏伟.2007.青藏高原东部上地幔各向异性及相关的壳幔耦合型式[J].中国科学:D辑,37(4):495-503.
吴晶,高原,陈运泰.2008.首都圈东南部地区地壳介质各向异性[J].地震学报,21(1):1-10.
殷海涛,李杰,张玲,吴晨,董晓娜.2008.基于GPS观测网的山东地区地壳运动特征分析[J].西北地震学报,30(3):276-281.
张中杰.2002.地震各向异性研究进展[J].地球物理学进展,17(2):281-293.
郑斯华,高原.1994.中国大陆岩石层的方位各向异性[J].地震学报,16(2):131-140.
An M,Shi Y.2006.Lithospheric thickness of the Chinese continent[J].Phys Earth Planet Interi,159(3-4):257-266.
Barruol G,Silver P G,Vauchez A.1997.Seismic anisotropy in the eastern US:Deep structure of a complex continentalplate[J].J Geophys Res,102(B4):8329-8348.
Bowman J R,Ando M.1987.Shear-wave splitting in the upper-mantle wedge above the Tonga subduction zone[J].Geo-phys J R Astron Soc,88(1):25-41.
Flesch L M,Holt W E,Silver P G,Stephenson M,Wang C Y,Chan W W.2005.Constraining the extent of crust-man-tle coupling in central Asia using GPS,geologic,and shear wave splitting data[J].Earth Planet Sci Lett,238(1-2):248-268.
Gao S S,Liu K H.2009.Significant seismic anisotropy beneath the southern Lhasa Terrane,Tibetan Plateau[J].Geo-chem Geophys Geosyst,10,Q02008,doi:10.1029/2008GC002227.
Hess H H.1964.Seismic anisotropy of the upper most mantle under oceans[J].Nature,203(9):629-631.
Huang W C,Ni J F,Tilmann F,Nelson D,Guo J R,Zhao W J,Mechie J,Kind R,Saul J,Rapine R,Hearn T M.2000.Seismic polarization anisotropy beneath the central Tibetan Plateau[J].J Geophys Res,105(B12):27,979-27,989.
McNamara D E,Owens T J,Silver P G,Wu F T.1994.Shear wave anisotropy beneath the Tibetan Plateau[J].J Geo-phys Res,99(B7):13655-13665.
Nicolas A,Christensen N I.1987.Formation of anisotropy in upper mantle peridotites:A review,in composition struc-ture and dynamics of the lithosphere-asthenosphere system[J].Geodyn Ser,16:111-123.
Pard J,Levin V.2002.Seismic anisotropy:Tracing plate dynamics in the mantle[J].Science,296(5567):485-489.
Richardson R M.1992.Ridge forces,absolute plate motions,and the intraplate stress field[J].J Geophys Res,97(B8):11739-11748.
Savage M K.1999.Seismic anisotropy and mantle deformation:What have we leamed from shear wave splitting[J].RevGeophys,37(1):65-106.
Silver P G,Chan W W.1991.Shear wave splitting and subcontinental mantle deformation[J].J Geophys Res,96:16429-16454.
Silver P G.1996.Seismic anisotropy beneath the continents:Probing the depths of geology[J].Annu Rev Earth PlanetSci,24:385-432.
Vecsey L,Plomerova J,Babuska V.2008.Shear-wave splitting measurements-Problems and solutions[J].Tectonophys-ics,462(1-4):178-196.
Vinnik L P,Kosarev G L,Makeyeva L I.1984.Anisotropy in the lithosphere from the ovbservations of SKS and SKKS[J].Dok Acad Nauk SSSR,278:1335-1339.
Wüstefeld A,Bokelmann G H R.2007.Null detection in shear-wave splitting measurements[J].Bull Seism Soc Amer,97(4):1204-1211.
Wüstefeld A,Bokelmann G H R,Zaroli C,Barruol G.2008.SplitLab:A shear-wave splitting environment in Matlab[J].Comput Geosci,34(5):515-528.
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