华东地区SKS波分裂研究
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摘要
本文搜集整理了华东地区6个区域地震台网的宽频带数字地震台站SKS波记录资料,使用最小切向能量的网络搜索法,得到了华东地区157个台站下方上地幔各向异性参数。测算结果表明,华东地区各向异性快波偏振方向主体为NW—SE向、南部近E—W向,逐渐呈旋转趋势,与绝对板块运动方向一致;其各向异性主要来自于上地幔,地壳与沉积层对各向异性影响较小;研究区内地下浅部与深部物质的运动模式基本一致,壳幔变形存在垂直连贯变形的特征。
SKS wave splitting measurement is a powerful tool to characterize seismic anisotropy.We have made measurements of SKS wave splitting beneath the east China mainland.We use the technique of minimum energy to determine SKS wave splitting parameters at 157 three-component broadband regional digital stations in East China regions.The results indicate that fast-wave polarization direction for anisotropy is basically in the NW-SE direction in east China and nearly E-W direction in the south,which gradually rotates and is the same with the absolute plate movement direction.The anisotropy is mainly caused by the upper mantle and rarely occasioned by the crust and the sediments.In the study area,the substance movement pattern between the shallow and deep is basically the same and the deformation model of the crust and the mantle possibly experiences vertically coherent deformation.
SKS wave splitting measurement is a powerful tool to characterize seismic anisotropy.We have made measurements of SKS wave splitting beneath the east China mainland.We use the technique of minimum energy to determine SKS wave splitting parameters at 157 three-component broadband regional digital stations in East China regions.The results indicate that fast-wave polarization direction for anisotropy is basically in the NW-SE direction in east China and nearly E-W direction in the south,which gradually rotates and is the same with the absolute plate movement direction.The anisotropy is mainly caused by the upper mantle and rarely occasioned by the crust and the sediments.In the study area,the substance movement pattern between the shallow and deep is basically the same and the deformation model of the crust and the mantle possibly experiences vertically coherent deformation.
引文
[1]Silver P G,Chan W W.Shear wave splitting and subcontinental mantle deformation[J].J GeophysRes,1991,96:16 429-16 454.
[2]Meissner R,Mooney W D,Artemieva I.Seismic anisotropy and mantle creep in young orogens[J].Geophys,2002,149:1-14.
[3]Hess H H.Seismic anisotropy of the uppermost mantle under oceans[J].Nature,1964,101:8 403-8 414.
[4]Mainpriee D,Silver P G.Interpretation of SKS-wave using samples from the subcontinental litho-sphere[J].Phys Earth Planet Inter,1993,78:257-280.
[5]Vinnik L P,Kosarev G L,Makeyeva L I.Anisotropy in the lithosphere from the ovbservations ofSKS and SKKS[J].Dok Acad Nauk SSSR,1984,278:1 335-1 339.
[6]郑斯华,高原.中国大陆岩石层的方位各向异性[J].地震学报,1994,16(2):131-140.
[7]罗艳,黄忠贤,彭艳菊,等.中国大陆及邻区SKS波分裂研究[J].地球物理学报,2004,47(5):812-820.
[8]Kelly H Liu,Stephen S Gao,Yuan Gao.Shear wave splitting and mantle flow associated with thedeflected Pacific slab beneath northeast Asia[J].J Geophys Res,2008,113:B01305,doi;10.1029/2007JB005178.
[9]Wustefeld A,Bokelmann G H R,Zaroli C,et al.Splitlab:A shear-wave splitting environment inMatlab[J].Comput Geosci,2008,34(5):515-528.
[10]常利军,王春镛,丁志峰.中国东部上地幔各向异性研究[J].中国科学,2009,39(9):1169-1178.
[11]石玉燕,颜启,林怀存.沂沭断裂带中部地区地震波速及地壳厚度的测定[J].地震研究,2003,26(4):328-331.
[12]罗艳,崇加军,倪四道,等.首都圈地区莫霍面起伏及沉积层厚度[J].地球物理学报,2008,51(4):1 135-1 144.
[13]吴晶,高原,陈运泰.首都圈东南部地区地壳介质各向异性[J].地震学报,2008,21(1):1-10.
[14]McNamara D E,Owens T J,Silver P G.Shear wave anisotropy beneath the Tibetan Plateau[J].JGeophys Res,1994,99(B7):13 655-13 665.
[15]彭艳菊,黄忠贤,苏伟,等.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,2007,50(3):752-759.
[16]An M,Shi Y.Lithospheric thickness of the Chinese continent[J].Phys Earth Planet Inter,2006,159:257-266.
[17]Chang L J,Wang C Y,Ding Z F.Seismic anisotropy of upper mantle in eastern China[J].Sci ChinaSer D-Earth Sci,2009,52(6):774-783.
[18]Ren J Y,Tamaki K,Li S.Late Mesozoic and Cenozoic rifting and its dynamic setting in EasternChina and adjacent areas[J].Tectonophysics,2002,344:175-205.
[19]马宗晋,陈鑫连.中国大陆现今地壳运动的GPS研究[J].科学通报,2001,46(13):1118-112.
[20]郑秀芬,欧阳飚,张东宁,等.“国家数字测震台网数据备份中心”技术系统建设及其对汶川大地震研究的数据支撑[J].地球物理学报,2009,52(5):1412-1417,doi:10.3969/j.issn.0001-5733.2009.05.031.
[2]Meissner R,Mooney W D,Artemieva I.Seismic anisotropy and mantle creep in young orogens[J].Geophys,2002,149:1-14.
[3]Hess H H.Seismic anisotropy of the uppermost mantle under oceans[J].Nature,1964,101:8 403-8 414.
[4]Mainpriee D,Silver P G.Interpretation of SKS-wave using samples from the subcontinental litho-sphere[J].Phys Earth Planet Inter,1993,78:257-280.
[5]Vinnik L P,Kosarev G L,Makeyeva L I.Anisotropy in the lithosphere from the ovbservations ofSKS and SKKS[J].Dok Acad Nauk SSSR,1984,278:1 335-1 339.
[6]郑斯华,高原.中国大陆岩石层的方位各向异性[J].地震学报,1994,16(2):131-140.
[7]罗艳,黄忠贤,彭艳菊,等.中国大陆及邻区SKS波分裂研究[J].地球物理学报,2004,47(5):812-820.
[8]Kelly H Liu,Stephen S Gao,Yuan Gao.Shear wave splitting and mantle flow associated with thedeflected Pacific slab beneath northeast Asia[J].J Geophys Res,2008,113:B01305,doi;10.1029/2007JB005178.
[9]Wustefeld A,Bokelmann G H R,Zaroli C,et al.Splitlab:A shear-wave splitting environment inMatlab[J].Comput Geosci,2008,34(5):515-528.
[10]常利军,王春镛,丁志峰.中国东部上地幔各向异性研究[J].中国科学,2009,39(9):1169-1178.
[11]石玉燕,颜启,林怀存.沂沭断裂带中部地区地震波速及地壳厚度的测定[J].地震研究,2003,26(4):328-331.
[12]罗艳,崇加军,倪四道,等.首都圈地区莫霍面起伏及沉积层厚度[J].地球物理学报,2008,51(4):1 135-1 144.
[13]吴晶,高原,陈运泰.首都圈东南部地区地壳介质各向异性[J].地震学报,2008,21(1):1-10.
[14]McNamara D E,Owens T J,Silver P G.Shear wave anisotropy beneath the Tibetan Plateau[J].JGeophys Res,1994,99(B7):13 655-13 665.
[15]彭艳菊,黄忠贤,苏伟,等.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,2007,50(3):752-759.
[16]An M,Shi Y.Lithospheric thickness of the Chinese continent[J].Phys Earth Planet Inter,2006,159:257-266.
[17]Chang L J,Wang C Y,Ding Z F.Seismic anisotropy of upper mantle in eastern China[J].Sci ChinaSer D-Earth Sci,2009,52(6):774-783.
[18]Ren J Y,Tamaki K,Li S.Late Mesozoic and Cenozoic rifting and its dynamic setting in EasternChina and adjacent areas[J].Tectonophysics,2002,344:175-205.
[19]马宗晋,陈鑫连.中国大陆现今地壳运动的GPS研究[J].科学通报,2001,46(13):1118-112.
[20]郑秀芬,欧阳飚,张东宁,等.“国家数字测震台网数据备份中心”技术系统建设及其对汶川大地震研究的数据支撑[J].地球物理学报,2009,52(5):1412-1417,doi:10.3969/j.issn.0001-5733.2009.05.031.
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