3D主动源地震折射/反射联合快速波前成像研究
|
摘要
基于深地震测深震相记录特征及最新发展起来的快速波前追踪方法,利用理论合成的3D主动源地震折射/反射数据,对强速度对比及复杂Moho结构的重建进行数值模拟计算。结果表明,折射震相Pg对上地壳细结构有较高的分辨,宽角反射震相PmP可较好地约束中下地壳及Moho界面的细结构特征,但对浅部结构的分辨力较差,折射和反射地震的联合成像可有效恢复深浅部3D空间的强速度对比结构及Moho界面形态特征。
Based on the seismic phase record characteristics of Deep Seismic Sounding and the fast marching method which has been developed recently,numerical simulation of joint inversion of active source seismic refraction and reflection for 3Dstructure is given.The results show that the refraction phase Pg has higher resolution for fine upper crustal structures,and that the middle-lower crustal structure and complex Moho geometry can be well recovered with wide angle reflection phase PmP,although it has poor resolution for the shallow structures.The joint inversion can effectively recover 3Dvelocity structure in any depth,with strong velocity contrasts and the morphological characteristics of Moho interface.
Based on the seismic phase record characteristics of Deep Seismic Sounding and the fast marching method which has been developed recently,numerical simulation of joint inversion of active source seismic refraction and reflection for 3Dstructure is given.The results show that the refraction phase Pg has higher resolution for fine upper crustal structures,and that the middle-lower crustal structure and complex Moho geometry can be well recovered with wide angle reflection phase PmP,although it has poor resolution for the shallow structures.The joint inversion can effectively recover 3Dvelocity structure in any depth,with strong velocity contrasts and the morphological characteristics of Moho interface.
引文
[1]Teng J W.Investigation of the Moho Discontinuity Beneath the Chinese Mainland Using Deep Seismic Sounding Profiles[J].Tectonophysics,2013,609:202-216
[2]张先康.阿尼玛卿缝合带东段上地壳结构[J].地震学报,2007,29(6):592-604(Zhang Xiankang.Upper Crust Structure of Eastern Animaqen Suture Zone:Results of Barkam-Luqu-Gulang Deep Seismic Sounding Profile[J].Acta Seismologica Sinica,2007,29(6):592-604)
[3]杨卓欣.华北莫霍面构造形态—深地震测深数据的三维反演[J].地震地质,2000,22(1):74-80(Yang Zhuoxin.Structure of Moho in North China-3DInversion from Deep Seismic Sounding Data[J].Geology and Seismology,2000,22(1):74-80)
[4]段永红.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 Yonghong.Three-Dimensional Finite-Difference Tomography of Velocity Structure of the Upper Crustal in North China[J].Chinese J Geophys,2002,45(3):362-369)
[5]白超英,黄国娇,李忠生.三维复杂层状介质中多震相走时联合反演成像[J].地球物理学报,2011,54(1):182-192(Bai Chaoying,Huang Guojiao,Li Zhongsheng.Simultaneous Inversion Combining Multiple-Phase Travel Times within 3DComplex Layered Media[J].Chinese J Geophys,2011,54(1):182-192)
[6]黄国娇,白超英.多震相走时联合三参数同时反演成像[J].地球物理学报,2013,56(12):4 215-4 225(Huang Guojiao,Bai Chaoying.Simultaneous Inversion of Three Model Parameters with Multiple Classes of Arrival Times[J].Chinese J Geophys,2013,56(12):4 215-4 225)
[7]Sethian J A,Popovici A M.3-D Traveltime Computation Using the Fast Marching Method[J].Geophysics,1999,64(2):516-523
[8]Rawlinson N,Sambridge M.Wavefront Evolution in Strongly Heterogeneous Layered Media Using the Fast Marching Method[J].Geophysical Journal International,2004,156:631-647
[9]Rawlinson N.Structure of the Tasmanian Lithosphere from3-D Seismic Tomography[J].Australian Journal of Earth Sciences,2010,57:381-394
[10]Kennett B L N.Subspace Methods for Large Scale Inverse Problems Involving Multiple Parameter Classes[J].Geophys J,1988,94:237-247
[11]Rawlinson N,Kennett B LN.Teleseismic Tomography of the Upper Mantle Beneath the Southern Lachan Orogen,Australia[J].Physics of the Earth and Planetary Interiors,2008,167,84-97
[12]Rawlinson N,Urvoy M.Simultaneous Inversion of Active and Passive Source Datasets for 3-D Seismic Structure with Application to Tasmania[J].Geophysical Research Letters,2006,33:1-5
[13]Rawlinson N.Seismic Wavefront Tracking in 3DHeterogeneous Media:Applications with Multiple Data Classes[J].ExplorationGeophysics,2006,37:322-330
[2]张先康.阿尼玛卿缝合带东段上地壳结构[J].地震学报,2007,29(6):592-604(Zhang Xiankang.Upper Crust Structure of Eastern Animaqen Suture Zone:Results of Barkam-Luqu-Gulang Deep Seismic Sounding Profile[J].Acta Seismologica Sinica,2007,29(6):592-604)
[3]杨卓欣.华北莫霍面构造形态—深地震测深数据的三维反演[J].地震地质,2000,22(1):74-80(Yang Zhuoxin.Structure of Moho in North China-3DInversion from Deep Seismic Sounding Data[J].Geology and Seismology,2000,22(1):74-80)
[4]段永红.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 Yonghong.Three-Dimensional Finite-Difference Tomography of Velocity Structure of the Upper Crustal in North China[J].Chinese J Geophys,2002,45(3):362-369)
[5]白超英,黄国娇,李忠生.三维复杂层状介质中多震相走时联合反演成像[J].地球物理学报,2011,54(1):182-192(Bai Chaoying,Huang Guojiao,Li Zhongsheng.Simultaneous Inversion Combining Multiple-Phase Travel Times within 3DComplex Layered Media[J].Chinese J Geophys,2011,54(1):182-192)
[6]黄国娇,白超英.多震相走时联合三参数同时反演成像[J].地球物理学报,2013,56(12):4 215-4 225(Huang Guojiao,Bai Chaoying.Simultaneous Inversion of Three Model Parameters with Multiple Classes of Arrival Times[J].Chinese J Geophys,2013,56(12):4 215-4 225)
[7]Sethian J A,Popovici A M.3-D Traveltime Computation Using the Fast Marching Method[J].Geophysics,1999,64(2):516-523
[8]Rawlinson N,Sambridge M.Wavefront Evolution in Strongly Heterogeneous Layered Media Using the Fast Marching Method[J].Geophysical Journal International,2004,156:631-647
[9]Rawlinson N.Structure of the Tasmanian Lithosphere from3-D Seismic Tomography[J].Australian Journal of Earth Sciences,2010,57:381-394
[10]Kennett B L N.Subspace Methods for Large Scale Inverse Problems Involving Multiple Parameter Classes[J].Geophys J,1988,94:237-247
[11]Rawlinson N,Kennett B LN.Teleseismic Tomography of the Upper Mantle Beneath the Southern Lachan Orogen,Australia[J].Physics of the Earth and Planetary Interiors,2008,167,84-97
[12]Rawlinson N,Urvoy M.Simultaneous Inversion of Active and Passive Source Datasets for 3-D Seismic Structure with Application to Tasmania[J].Geophysical Research Letters,2006,33:1-5
[13]Rawlinson N.Seismic Wavefront Tracking in 3DHeterogeneous Media:Applications with Multiple Data Classes[J].ExplorationGeophysics,2006,37:322-330
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心