用背景噪声和地震面波反演东北地区岩石圈速度结构
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摘要
本文利用东北地区的黑龙江、吉林、辽宁和内蒙古等四省区区域数字地震台网122个宽频带地震台站记录的波形数据,分别通过背景噪声互相关及地震面波提取8～25s和25～70s的瑞利面波频散曲线,进而反演得到东北地区从浅到深直至约100km的岩石圈速度结构。结果表明,周期为8s至15s的短周期群速度分布与地表构造特征有较好的对应关系,盆岭边界的大型断裂对上地壳速度结构的控制作用明显,松辽盆地呈现较厚的低速沉积盆地特征;周期为20s至30s的群速度与短周期时相比出现明显变化,反映了以大兴安岭—太行山重力梯度带为界,西部地区莫霍面深度大于东部地区;周期为50s至70s的长周期群速度图表现为随着周期的增加,东部低速区域西移而西部显示稳定高速,可能反映了研究区受太平洋板块俯冲影响,大兴安岭以东地区软流圈热物质上涌的特征。
We have inverted Rayleigh wave dispersion measurements to image the group velocity structure of the lithosphere under the northeastern China to a depth of about 100 km,using waveform data recorded by 122 broadband stations of Heilongjiang,Jilin,Liaoning and Inner Mongolia digital seismic networks.Rayleigh wave group velocities at periods of 8~25 s and 25~70 s were measured from ambient noise cross-correlation and surface wave,respectively.At the short periods of 8~15 s,group velocities are notably correlated with the surface geology and controlled apparently by the large faults dividing basins and ranges.Beneath Songliao Basin,the significant low velocity suggests there is relatively thick sediment.Compared with the group velocities of 8~25 s periods,velocities at periods of 20~30 s change drastically,which reveal that Moho depths in the western regions of North-South gravity lineament(NSGL) are deeper than that in the eastern regions.At the long periods of 50~70 s,with the increase of the periods,the low-velocity in the eastern regions move westward;meanwhile,the western regions show stable high-velocity features.The results may suggest asthenospheric upwelling under the eastern regions of NSGL which may be affected by the subduction of Pacific slab.
We have inverted Rayleigh wave dispersion measurements to image the group velocity structure of the lithosphere under the northeastern China to a depth of about 100 km,using waveform data recorded by 122 broadband stations of Heilongjiang,Jilin,Liaoning and Inner Mongolia digital seismic networks.Rayleigh wave group velocities at periods of 8~25 s and 25~70 s were measured from ambient noise cross-correlation and surface wave,respectively.At the short periods of 8~15 s,group velocities are notably correlated with the surface geology and controlled apparently by the large faults dividing basins and ranges.Beneath Songliao Basin,the significant low velocity suggests there is relatively thick sediment.Compared with the group velocities of 8~25 s periods,velocities at periods of 20~30 s change drastically,which reveal that Moho depths in the western regions of North-South gravity lineament(NSGL) are deeper than that in the eastern regions.At the long periods of 50~70 s,with the increase of the periods,the low-velocity in the eastern regions move westward;meanwhile,the western regions show stable high-velocity features.The results may suggest asthenospheric upwelling under the eastern regions of NSGL which may be affected by the subduction of Pacific slab.
引文
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[21]刘洋,刘财,杨宝俊,等.松辽盆地北部纵波速度区域特征分析及深层油气问题[J].地球物理学进展,2008,23(3):785-792.
[22]李志安,闰义.中国东北造山带-盆地系统动力学研究[J].大地构造与成矿学,2000,24(1):31-37.
[23]杨宝俊,穆石敏,金旭,等.中国满洲里-绥芬河地学断面地球物理综合研究[J].地球物理学报,1996,39(6):772-783.
[24]江为为,周立宏,肖敦清,等.东北地区重磁场与地壳结构特征[J].地球物理学进展,2006,21(3):730-738.
[25]杨宝俊,刘财,刘万崧,等.中国东北地区岩石圈结构的地震学特征与对矿产资源的动力控制作用[J].中国地质,2006,33(4):866-873.
[26]杨宝俊,刘万崧,王喜臣,等.中国东部大兴安岭重力梯级带域地球物理场特征及其成因[J].地球物理学报,2005,48(1):86-97.
[27]Huang J L,Zhao D P.High-resolution mantle tomography of China and surrounding regions[J].JGeophys Res,2006,111(B09305),doi:10.1029/2005JB004066.
[28]Niu Y L.Generation and evolution of basaltic magmas:Some basic concepts and a new view on theorigin of Mesozoic-Cenozoic basaltic volcanism in eastern China[J].Geological Journal of China Uni-versities,2005,11:9-46.
[29]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]车自成,刘良,罗金海.中国及其邻区区域大地构造学[M].北京:科学出版社,2002.250-261.
[3]吴福元,孙德有.中国东部中生代岩浆作用与岩石圈减薄[J].长春科技大学学报,1999,29(4):313-318.
[4]吴福元,葛文春,孙德有,等.中国东部岩石圈减薄研究中的几个问题[J].地学前缘(中国地质大学,北京),2003,10(3):51-60.
[5]黄忠贤,胥颐,郝天珧,等.中国东部海域岩石圈结构面波层析成像[J].地球物理学报,2009,52(3):653-662.
[6]何正勤,丁志峰,叶太兰,等.中国大陆及其邻域的瑞利波群速度分布图象与地壳上地幔速度结构[J].地震学报,2002,24(3):252-259.
[7]Huang Z X,Su W,Peng Y J,et al.Rayleigh wave tomography of China and adjacent regions[J].JGeophys Res,2003,108(B2),2 073,doi:10.1029/2001JB001696.
[8]Liang C T,Langston C A.Ambient seismic noise tomography and structure of eastern North Ameri-ca[J].J Geophys Res,2008,113(B03309),doi:10.1029/2007JB005350.
[9]高东辉,陈永顺,孟宪森,等.黑龙江地区背景噪声面波群速度层析成像[J].地球物理学报,2011,54(4):1 043-1 051.
[10]Zheng Y,Shen W S,Zhou L Q,et al.Crust and uppermost mantle beneath the North China Cra-ton,northeastern China,and the Sea of Japan from ambient noise tomography[J].J Geophys Res,2011,116(B12312).doi:10.1029/2011JB008637.
[11]Yang Y J,Li A,Ritzwoller M H.Crustal and uppermost mantle structure in southern Africa re-vealed from ambient noise and teleseismic tomography[J].Geophys J Int,2008,174(1):235-248.
[12]Moschetti M P,Ritzwoller M H,Lin F C,et al.Crustal shear velocity structure of the western USinferred from amient noise and earthquake data[J].J Geophys Res,2010,115(B10306),doi:10.1029/2010JB007448.
[13]Yao H J,Van Der Hilst R D,de Hoop M V.Surface-wave array tomography in SE Tibet from am-bient noise and two-station analysis—Ⅰ.Phase velocity maps[J].Geophys J Int,2006,166(2):732-744.
[14]Bensen G D,Ritzwoller M H,Bamin M P,et al.Processing seismic ambient noise data to obtain re-liable broad-band surface wave dispersion measurements[J].Geophys J Int,2007,169:1 239-1 260.
[15]刘志坤,黄金莉.利用背景噪声互相关研究汶川地震震源区地震波速度变化[J].地球物理学报,2010,53(4):853-863.
[16]Stehly L,Campillo M,Shapiro N M.A study of the seismic noise from its long-range correlationproperties[J].J Geophys Res,2006,111(B10306),doi:10.1029/2005JB004237.
[17]Shapiro N M,Ritzwoller M H.Monte-Carlo inversion for a global shear velocity model of the crustand upper mantle[J].Geophys J Int,2002,151:88-105.
[18]Herrmann R B,Ammon C J.Computer programs in seismology:Surface Waves,Receiver Functionsand Crustal Structure[M].Missouri:StLouis University,StLouis,MO,USA.2002.
[19]Liang C T,Song X D,Huang J L.Tomographic inversion of Pn travel times in China[J].J GeophysRes,2004,109(B11304),doi:10.1029/2003JB002789.
[20]Yang Y J,Ritzwoller M H,Levshin A L,et al.Ambient noise Rayleigh wave tomography acrossEurope[J].Geophys J Int,2007,168:259-274.
[21]刘洋,刘财,杨宝俊,等.松辽盆地北部纵波速度区域特征分析及深层油气问题[J].地球物理学进展,2008,23(3):785-792.
[22]李志安,闰义.中国东北造山带-盆地系统动力学研究[J].大地构造与成矿学,2000,24(1):31-37.
[23]杨宝俊,穆石敏,金旭,等.中国满洲里-绥芬河地学断面地球物理综合研究[J].地球物理学报,1996,39(6):772-783.
[24]江为为,周立宏,肖敦清,等.东北地区重磁场与地壳结构特征[J].地球物理学进展,2006,21(3):730-738.
[25]杨宝俊,刘财,刘万崧,等.中国东北地区岩石圈结构的地震学特征与对矿产资源的动力控制作用[J].中国地质,2006,33(4):866-873.
[26]杨宝俊,刘万崧,王喜臣,等.中国东部大兴安岭重力梯级带域地球物理场特征及其成因[J].地球物理学报,2005,48(1):86-97.
[27]Huang J L,Zhao D P.High-resolution mantle tomography of China and surrounding regions[J].JGeophys Res,2006,111(B09305),doi:10.1029/2005JB004066.
[28]Niu Y L.Generation and evolution of basaltic magmas:Some basic concepts and a new view on theorigin of Mesozoic-Cenozoic basaltic volcanism in eastern China[J].Geological Journal of China Uni-versities,2005,11:9-46.
[29]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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