利用双平面波干涉面波层析成像方法研究山西断陷盆地及鄂尔多斯地台三维速度结构
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摘要
本文利用了北京大学在山西地堑的34个台站以及中国地震局台网中心在鄂尔多斯地区46个台站的远震波形数据,运用双平面波干涉的面波层析成像方法,提取瑞利面波相速度频散曲线,开展台阵覆盖区三维速度结构反演,据此分析了研究区地壳和上地幔的结构特征。结果表明,瑞利面波相速度分区特征显著,山西断陷盆地和渭河断陷盆地的相速度整体偏低。鄂尔多斯块体在莫霍面以下有明显高速异常,表明该地块为构造稳定的克拉通块体,鄂尔多斯块体的岩石圈下界面在120～140km的深度左右。与此相反,山西断陷盆地和渭河断陷盆地地下70～120km左右均有低速异常,显示这两个地区构造活动活跃,这也与该区域历史上多次发生强震是相符的。
Using the broad-band seismic data of Peking University and CENC,taking the method of two plane waves tomography,we have obtain the phase velocities of Rayleigh wave and the 3D shear velocities in Ordos region.Through analyzing the results,we have found the phase velocities of Rayleigh wave in Shanxi graben and Weihe graben are lower.High velocity anomaly beneath moho has been observed in Ordos block,indicate that Ordos block is a stable craton,and its effect extend to 120km depth at least;in the depth between 70 and 120km of Shanxi graben and Weihe graben,shear velocities were lower than origin model,indicating that the substance there had plasticity and these region are strong activity,which is consistent with the activity of earthquake.
Using the broad-band seismic data of Peking University and CENC,taking the method of two plane waves tomography,we have obtain the phase velocities of Rayleigh wave and the 3D shear velocities in Ordos region.Through analyzing the results,we have found the phase velocities of Rayleigh wave in Shanxi graben and Weihe graben are lower.High velocity anomaly beneath moho has been observed in Ordos block,indicate that Ordos block is a stable craton,and its effect extend to 120km depth at least;in the depth between 70 and 120km of Shanxi graben and Weihe graben,shear velocities were lower than origin model,indicating that the substance there had plasticity and these region are strong activity,which is consistent with the activity of earthquake.
引文
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[20]Ringwood AE.Composition and Petrology of the Earth's Mantle[M].New York:McGraw-Hill,1975.
[21]易桂喜,姚华建,朱介寿,等.中国大陆及领区Rayleigh面波相速度分布特征[J].地球物理学报,2008,51(2):402-411.Yi GX,Yao HJ,Zhu JS,et al.Rayleigh wave phase velocity distribution in China continent and its adjacent regions[J].Chinese Journal Geophysics,2008,51(2):402-411.
[22]王志铄,王椿墉,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,2008,16(2):15-27.Wang ZS,Wang CY,Zeng RS,et al.Tomographic imaging of P and S wave velocity structures beneath North China and its vicinity[J].CT Theory and Applications,2008,16(2):15-27.
[2]邓晋福,魏文博,邱瑞照,等.中国华北地区岩石圈三维结构及演化[M].北京:地质出版社,2007.Deng JF,Wei WB,Qiu RZ,et al.The three-dimensional structure of lithosphere and its evolution in North China[M].Beijing:The Geological Publishing House,2007.
[3]陈国英,宋仲和,安昌强,等.华北地区三维地壳上地幔结构[J].地球物理学报,1991,34(2):172-181.Chen GY,Song ZH,An CQ,et al.Three-dimensional crust and upper mantle structure of the North China region[J].Chinese Journal Geophysics,1991,34(2):172-181.
[4]彭艳菊,苏伟,郑月军,等.中国大陆及海域Love波层析成像[J].地球物理学报,2002,45(6):792-801.Peng YJ,Su W,Zheng YJ,et al.Love wave seismic tomography of China and vicinal sea areas[J].Chinese Journal Geophysics[J],2002,45(6):792-801.
[5]Li A,Burke K.Upper mantle structure of southern Africa from Rayleigh wave tomography[J].Journal of Geophysical Research,2006,111:10303-10318.
[6]Friederich W.Propagation and structural interpretation of non-plane waves[J].Geophysical Journal International,1993,113:45-53.
[7]Ewing M,Press F.Determination of crustal structure from phase velocity of Rayleigh wave,part3:The United States[J].Geological Society of America Bulletin,1959,70(3):229-244.
[8]Aki K.Further study of mechanism of circum-Pacific earthquakes from Rayleigh waves[J].Journal of Geophysical Research,1960,65:4165-4172.
[9]Friederich W,Wielandt E.Interpretation of seismic surface waves in regional networks;joint estimation of wavefield geometry and local phase velocity;method and numerical tests[J].Geophysical Journal International,1995,120(3):731-744.
[10]Friederich W.Wave-theoretical inversion of teleseismic surface waves in a regional network:Phase-velocity maps and a three-dimensional upper-mantle shear-wave-velocitymodel for southern Germany[J].Geophysical Journal International,1998,132:203-225.
[11]Forsyth DW.Phase velocities of Rayleigh waves in the MELT experiment on the East Pacific Rise[J].Science,1998,280:1235-1238.
[12]Carlson RW,Pearson DG,James DE.Physical,chemical,and chronological characteristics of continental mantle[J].Reviews of Geophysics,2005,43:1001-1024.
[13]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.Zheng XF,Ouyang B,Zhang DN,et al.Technical system construction of“Data Backup Centre for China Seismograph Network”and the data support to researches on the Wenchuan earthquake[J].Chinese Journal Geophysics,2009,52(5):1412-1417.
[14]郑秀芬,陈朝辉,张春贺.1999年台湾集集地震余震区—嘉义地区地震的剪切波分裂参数随时间变化的研究[J].地球物理学报,2008,51(1):149-157.Zheng XF,Chen CH,Zhang CH.Study on temporal variations of shear-wave splitting in the Chiayi area,aftershock zone of1999Chichi earthquake,Taiwan[J].Chinese Journal Geophysics,2008,51(1):149-157.
[15]Li A,Forsyth DW,Fischer KM.Shear velocity structure and azimuthal anisotropy beneath eastern North America from Rayleigh wave inversion[J].Journal of Geophysical Research,2003,108:2362-2385.
[16]Tarantola A,Valette B.Generalized non-linear problems solved using the least-squares criterion[J].Reviews of Geophysics and Space Physics,1982,20:219-232.
[17]Saito M.DISPER80:A subroutine package for the calculation of seismic normal-mode solutions,seismological algorithms[M].London:Academic Press,1988.
[18]Kennett BLN,Engdahl ER,Buland R.Constraints on seismic velocities in the Earth from traveltimes[J].Geophysical Journal International,1995,122:108-124
[19]Weeraratne DS,Forsyth DW,Fischer KM,et al.Rayleigh wave tomography evidence for an upper mantle plume beneath the Tanzanian craton[J].Journal of Geophysical Research,2003,108(B9):2427-2443.
[20]Ringwood AE.Composition and Petrology of the Earth's Mantle[M].New York:McGraw-Hill,1975.
[21]易桂喜,姚华建,朱介寿,等.中国大陆及领区Rayleigh面波相速度分布特征[J].地球物理学报,2008,51(2):402-411.Yi GX,Yao HJ,Zhu JS,et al.Rayleigh wave phase velocity distribution in China continent and its adjacent regions[J].Chinese Journal Geophysics,2008,51(2):402-411.
[22]王志铄,王椿墉,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,2008,16(2):15-27.Wang ZS,Wang CY,Zeng RS,et al.Tomographic imaging of P and S wave velocity structures beneath North China and its vicinity[J].CT Theory and Applications,2008,16(2):15-27.
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