安阳及邻区三维地壳速度结构研究
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摘要
应用区域地震台网1985～2008年的地震到时资料,对安阳及邻区地壳三维速度结构和震源参数进行了联合反演,获得了该区地壳的三维速度结构图像.成像结果表明:研究区浅部地形速度分布特征为:凹陷盆地速度较低,山脉位于速度的过渡区,隆起区多位于高速区,速度横向分布差异较大;上、中地壳速度横向分布存在非均匀性,与区域构造分布特征存在着一定的联系;下地壳中、上部的速度分布表现为东部平原区域速度较高,西部太行山隆起区速度较低.区内断裂展布与速度横向变化较大地区有着较好的对应,多条断裂走向与高低速过渡带一致,断裂两侧速度存在明显差异;不同位置的深度剖面显示地震分布多位于速度横向分布不均匀处,同时与邻近断裂的分布也有着较好的对应关系.成像结果反映出深部构造的重要信息,为进一步研究该区的活动构造及地震参数计算,提供了科学依据.
The 3-D velocity tomography image of the Anyang and its adjacent regions is obtained by the joint inversion of 3-D velocity structure and focal parameters using the earthquakes recorded by the local seismic network between 1985 and 2008.The imaging results show that velocity distribution characteristics in the shallow terrain of the study area is:The velocity of down-warped basin is relatively low,mountains are in the velocity transition zone,the uplift area is located in the high velocity zone,large difference is in lateral velocity distribution.There exists obvious lateral inhomogeneity in the up-middle crust,which has some contact with regional tectonic distribution characteristics.The velocity distribution in the up-middle section of the lower crust exhibits high velocity in eastern plain,while Taihang uplift in western shows low.The spread of faults corresponds to the area with large lateral velocity variation.The trend of multiple fault zone is consistent with the high-low velocity transition zone,while there are significant velocity differences in both sides of the fracture zone.The depth profiles in different locations indicate that earthquakes are mainly located in the area where lateral velocity distributes unevenly.At the same time,it also has a good corresponding relation to the distribution of the nearby fracture.The inversed velocity structure does primarily reflect some important features of the deep structure in the region and provides the scientific basis for the further study of active tectonic structure and the calculation of earthquake parameters.
The 3-D velocity tomography image of the Anyang and its adjacent regions is obtained by the joint inversion of 3-D velocity structure and focal parameters using the earthquakes recorded by the local seismic network between 1985 and 2008.The imaging results show that velocity distribution characteristics in the shallow terrain of the study area is:The velocity of down-warped basin is relatively low,mountains are in the velocity transition zone,the uplift area is located in the high velocity zone,large difference is in lateral velocity distribution.There exists obvious lateral inhomogeneity in the up-middle crust,which has some contact with regional tectonic distribution characteristics.The velocity distribution in the up-middle section of the lower crust exhibits high velocity in eastern plain,while Taihang uplift in western shows low.The spread of faults corresponds to the area with large lateral velocity variation.The trend of multiple fault zone is consistent with the high-low velocity transition zone,while there are significant velocity differences in both sides of the fracture zone.The depth profiles in different locations indicate that earthquakes are mainly located in the area where lateral velocity distributes unevenly.At the same time,it also has a good corresponding relation to the distribution of the nearby fracture.The inversed velocity structure does primarily reflect some important features of the deep structure in the region and provides the scientific basis for the further study of active tectonic structure and the calculation of earthquake parameters.
引文
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[2]Beghoul N,Barazangi M.Mapping high Pn velocity beneath the Colorado Plateau constrains uplift models[J].J. Geophys.Res.,1989,94(B6):7083-7104.
[3]Haslinger F,Kissling E,Ansorge J,et al.3D crustal structurefrom local earthquake tomography around the Gulf of Arta(Ionianregion,NW Greece)[J],Tectonophysics,1999, 304(3):201-218.
[4]Zhao D.Global tomographic images of mantle plumes and subducting slabs:insight into deep Earth dynamics[J].Physics of the Each and Planetary Interiors,2004,146(1-2):3-34.
[5]刘福田,曲克信,吴华,等.中国大陆及其邻区的地震层析成像[J].地球物理学报,1989,32(3):281-291. Liu F T,Qu K X,Wu H,et al.Seismic tomography of the Chinese continent and adjacent region[J].Chinese J. Geophys.(in Chinese),1989,32(3):281-291.
[6]宋仲和,安昌强,陈国英,等.中国西部三维速度结构及其各向异性[J].地球物理学报,1991,34(6):694-707. Song Z H,An C Q,Chen G Y,et al.Study on 3D velocity structure and anisotropy beneath the west China from the Love wave despersion[J].Chinese J.Geophys.(in Chinese), 1991,34(6):694-707.
[7]胡家富,张中杰,张慧,等.中国内蒙古高原及周边地带岩石圈三维速度结构[J].地球物理学进展,1996,11(4):20- 33. Hu J F,Zhang Z J,Z H,et al.The 3-D shear wave velocity structure of lithospheve beneath the plateau of Nei Mongol and its adjacent regions of China[J].Progress in Geophysics(in Chinese),1996,11(4):20-33.
[8]黄金莉,赵大鹏,郑斯华.川滇活动构造区地震层析成像[J].地球物理学报,2001,44(增刊):127-135. Huang J I,Zhao D P,Zheng S H.Seismic tomography of the Sichuan-Yunnan active tectonic regions[J].Chinese J. Geophys.(in Chinese),2001,44(Suppl.):127-135.
[9]刘建华,胥颐,郝天珧,等.中国边缘海及邻区地壳和上地幔速度结构特征[J].地球物理学进展,2005,20(3):594- 599. Liu J H,Xu Y,Hao T Y,et al.Three dimensional velocity structure feature in the crust and upper mantle beneath Chinese marginal seas and adjacent regions[J].Progress in Geophysics(in Chinese),2005,20(3):594-599.
[10]周民都,张元生,石雅耀,等.青藏高原东北缘地壳三维速度结构[J].地球物理学进展,2006,21(1):127-134. Zhou M D,Zhang Y S,Shi Y Y,et al.Three-dimensional crustal velocity structure in the northeastern margin of the Qinghai-Tibetan plateau[J].Progress in Geophysics(in Chinese),2006,21(1):127-134.
[11]郑建常,顾瑾平,张元生.联合反演研究华北地区三维速度结构[J].地球物理学进展,2007,22(6):1706-1714. Zheng J C,Gu J P,Zhang Y S.Combined Inversion of the upper crust 3-D velocity structure in north China[J]. Progress in Geophysics(in Chinese),2007,22(6):1706- 1714.
[12]郭飚,刘启元,陈九辉,等.川西龙门山及邻区地壳上地幔远震P波层析成像[J].地球物理学报,2009,52(2):346- 355. Guo B,Liu Q Y,Chen J H,et al.Teleseismic P-wave tomography of the crust and upper mantle in Longmenshan area,west Sichuan[J].Chinese J.Geophys.(in Chinese), 2009,52(2):346-355.
[13]吴建平,黄媛,张天中,等.汶川Ms8.0级地震余震分布及周边区域P波三维速度结构研究[J].地球物理学报,2009, 52(2):320-328. Wu J P,Huang Y,Zhang T Z,et al.Aftershock distribution of the Ms8.0 Wenchuan earthquake and three dimensional Pwave velocity structure in and around source region[J]. Chinese J.Geophys.(in Chinese),2009,52(2):320-328.
[14]杨卓欣,段永红,王夫运,等.银川盆地深地震断层的三维透射成像[J].地球物理学报,2009,52(8):2026-2034. Yang Z X,Duan Y H,Wang F Y,et al.Tomographic determination of the deep earthquake faults in Yinchuan basin by using three-dimensional seismic transmission technology [J].Chinese J.Geophys.(in Chinese),2009,52(8):2026- 2034.
[15]崔仲雄,裴顺平.青藏高原东构造结及周边地区上地幔顶部Pn速度结构和各向异性研究[J].地球物理学报,2009,52 (9):2245-2254. Cui Z X,Pei S P.Study on Pn velocity and anisotropy in the uppermost mantle of the Eastern Himalayan Syntaxis and surrounding regions[J],Chinese J.Geophys.(in Chinese), 2009,52(9):2245-2254.
[16]李永华,吴庆举,田小波,等.用接收函数方法研究云南及其邻区地壳上地幔结构[J].地球物理学报,2009,52(1): 67-80 Li Y H,W u QJ,Tian X B,et al.Crustal structure in the Yunnan region determined by modeling receiver functions [J].Chinese J.Geophys.(in Chinese),2009,52(1).67- 80.
[17]杨峰,黄金莉,杨挺.应用远震有限频率层析成像反演首都圈上地幔速度结构[J].地球物理学报,2010,53(8):1806- 1816. Yang F,Huang J I,Yang T.Upper mantle structure beneath the Chinese capital region from teleseismic finitefrequency tomography[J].Chinese J.Geophys.(in Chinese), 2010,53(8):1806-1816.
[18]丁志峰.近震层析成像的理论及应用[D].北京:中国地震局地球物理研究所,1999. Ding Z F.Theory and Applications of Local earthquake tomography(in Chinese )[D].Beijing:Institute of Geophysics,China Earthquake Administration,1999.
[19]段永红,张先康,方盛明.华北地区上部地壳结构的三维有限差分层析成像[J].地球物理学报,2002,45(3):362- 369. Duan Y H,Zhang X K,Fang S M.Three dimensional finitedifference tomography of velocity structure of the upper crustal in north China[J].Chinese J.Geophys.(in Chinese), 2002,45(3):362-369.
[20]王志铄,王椿镛,曾融生,等.华北及邻区地壳上地幔三维速度结构的地震走时层析成像[J].CT理论与应用研究, 2008,17(2):15-27. Wang Z S,Wang C Y,Zeng R S,et al.Tomographic imaging of P and S wave velocity structures beneath north China and its vicinity[J].CT Theory and Applications(in Chinese),2008,17(2):15-27.
[21]魏文博,叶高峰,金胜,等.华北地区地壳P波三维速度结构[J].地球科学-中国地质大学学报,2007,32(4):441- 452. Wei W B,Ye G F,Jin S,et al.Three dimensional P-wave velocity structure of the crust of north China[J].Earth Science- Journal of China University of Geosciences(in Chinese),2007,32(4):441-452.
[22]胡鸿翔,陈学波,张碧秀,等.中国中原地区随县—安阳剖面深地震测深资料的解释[J].地震学报,1986,8(1):37- 49. Hu H X,Chen X B,Zhang B X,et al.On the interpretation of the DDS data of Suixian-Anyang profile in central China [J].Acta Seismologica Sinica(in Chinese),1986,8(1): 37-49.
[23]嘉世旭,刘昌铨.华北裂谷盆地南部菏泽—长治地震测深剖面结果解释[J].华北地震科学,1991,9(2):11-20. Jia S X,Liu C Q.Interpretation of Heze-Changzhi DSS profile in south of the basin in North China[J].North ChinaEarthquake Sciences(in Chinese),1991,9(2):11—20.
[24]赵金仁,张先康,张成科,等.河南林县地震区地壳深部构造背景探讨[J].中国地震,1999,15(3):229-236. Zhao J R,Zhang X K,Zhang C K,et al.The structure features of deep crustal structure in seismic area of Linxian, Henan Province[J].Earthquake Research in China(in Chinese),1999,15(3):229-236.
[25]冯乃琦,贾红军,余珍友.安阳县地质灾害分区特征及防治对策[J].华北水利水电学院学报,2007,28(4):85-87. Feng N Q,Jia H J,Yu Z Y.Characteristics and prevention countermeasures of Anyang County geological hazards zone [J]- Journal of Noah China Institute of Water Conservancy and Hydroelectric Power(in Chinese),2007,28(4):85- 87.
[26]闫俊岗,王利兵,孙晴.晋冀鲁豫相邻地区中小地震震源机制特征分析[J].山西地震,2008,(4):1-7. Yan J G,Wang L B,Sun Q.Focal mechanism characteristics of small and medium earthquakes in border area of Shanxi, Hebei,Shandong and Henan[J].Earthquake Research in Shanxi(in Chinese),2008,(4):1-7.
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