黄土高原及邻区地壳P波速度结构
|
摘要
利用地震波走时联合反演算法(改进型最短路径算法)进行三维弯曲地震射线追踪正演,以及共轭梯度法求解带约束的阻尼最小二乘问题进行反演,同时更新速度模型和地震震中位置,结合地方震和区域地震走时资料得到了黄土高原(含汾渭断陷盆地)及邻区地壳三维P波速度结构.其横向变化结果表明,研究区地壳内的P波高速异常区与其内的地震活动构造带相一致,地震多发生在P波高速异常区的边缘或高、低速异常区的交汇处.秦岭山区和鄂尔多斯块体东南区为P波低速异常区.而垂向变化结果则表明研究区存在低速异常区.
A simultaneous travel time inversion procedure was developed in collaboration with a modified shortest path algorithm, which was applied to a bent ray tracing forward calculation. The conjugate gradient algorithm was used to solve a damped least square problem. The crustal P-wave velocity structure beneath the Loess Plateau and its surrounding regions of China were tomographically imagined down to the depth of 50 km by inverting P wave travel time data from local and regional earthquakes. The result indicates that lateral high velocity anomaly regions generally coincide with the seismically active zones, while vertical velocity variations show existence of a low velocity zone.
A simultaneous travel time inversion procedure was developed in collaboration with a modified shortest path algorithm, which was applied to a bent ray tracing forward calculation. The conjugate gradient algorithm was used to solve a damped least square problem. The crustal P-wave velocity structure beneath the Loess Plateau and its surrounding regions of China were tomographically imagined down to the depth of 50 km by inverting P wave travel time data from local and regional earthquakes. The result indicates that lateral high velocity anomaly regions generally coincide with the seismically active zones, while vertical velocity variations show existence of a low velocity zone.
引文
白超英,秦保燕.1990.深部剪切形变带对浅源地震的控制-立交模式有限元的模拟计算[J].西北地震学报,12(1):1--11.
陈九辉,刘启元,李顺成,郭飙,赖院根.2005.青藏高原东北缘—鄂尔多斯地块地壳上地幔S波速度结构[J].地球物理学报,48(2):333--342.
丁韫玉,狄秀岭,袁志祥,薛广盈.2000.渭河断陷地壳三维S波速度结构和vP/vS分布图像[J].地球物理学报,43(2):194--202.
嘉世旭,张先康.2005.华北不同构造块体地壳结构及其对比研究[J].地球物理学报,48(3):611--620.
江为为,郝天珧,胥颐,刘振峰,朱东英,涂广红.2007.中国中南地区综合地质地球物理研究[J].地球物理学报,50(1):171--183.
雷建设,周蕙兰,赵大鹏.2002.帕米尔及邻区地壳上地幔P波三维速度结构的研究[J].地球物理学报,45(6):802--811.
吕作勇,吴建平.2010.华北地区地壳上地幔三维P波速度结构[J].地震学报,32(1):1--11.
郭飚,刘启元,陈九辉,赵大鹏,李顺成,赖院根.2004.青藏高原东北缘—鄂尔多斯地壳上地幔地震层析成像研究[J].地球物理学报,47(5):790--797.
唐小平,白超英.2009a.最短路径算法下三维层状介质中多次波追踪[J].地球物理学报,52(10):2635--2643.
唐小平,白超英.2009b.最短路径算法下二维层状介质中多次波追踪[J].地球物理学进展,24(6):2087--2096.
王志铄,王椿镛,曾融生,王溪莉.2008.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,17(2):15--27.
曾融生,丁志峰,吴庆举.1998.喜马拉雅—祁连山地壳构造与大陆—大陆碰撞过程[J].地球物理学报,41(1):49--60.
Bai C Y.2004.Three-Dimensional Seismic Kinematic Inversion with Application to Reconstruction of the VelocityStructure of Rabaul Volcano[D].Australia:The University of Adelaide.
Bai C Y,Greenhalgh S.2006.3Dlocal earthquake hypocenter determination with an irregular shortest path method[J].Bull Seism Soc Amer,96(6):2257--2268.
Bai C Y,Greenhalgh S.2005a.3-D multi-step travel time tomography:Imaging the local,deep velocity structure ofRabaul volcano,Papua New Guinea[J].Phys Earth Planet Interi,151(3--4):259--275.
Bai C Y,Greenhalgh S.2005b.3-D non-linear travel time tomography:Imaging high contrast velocity anomalies[J].Pure Appl Geophys,162(11):2029--2049.
Bai C Y,Greenhalgh S,Zhou B.2007.3Dray tracing using a modified shortest path method[J].Geophysics,72(4):T27--T36.
Bai C Y,Tang X P,Zhao R.2009.2-D/3-D multiply transmitted,converted and reflected arrivals in complex layeredmedia with the modified shortest path method[J].Geophys J Inter,179(1):201--214.
Bai C Y,Huang G J,Zhao R.2010.2-D/3-D irregular shortest-path ray tracing for multiple arrivals and its applications[J].Geophys J Inter,183(3):1596--1612.
Bullen K E.1963.An Introduction to the Theory of Seismology[M].Cambridge:Cambridge University Press:189--217.
Inoue H,Fukao Y,Tanabe K,Ogata Y.1990.Whole mantle P-wave travel time tomography[J].Phys Earth Planet In-teri,59(4):294--328.
McNamara D E,Walter W R,Owens T J,Ammon C J.1997.Upper mantle velocity structure beneath the Tibetan Plat-eau[J].J Geophys Res,102(B1):493--505.
Scales J A.1987.Tomographic inversion via the conjugate gradient method[J].Geophysics,52(2):179--185.
Wang C Y,Han W B,Wu J P,Lou H,Chan W W.2007.Crustal structure beneath the eastern margin of the TibetanPlateau and its tectonic implications[J].J Geophys Res,112(B7):1--21.
Zhou B,Greenhalgh S,Sinadinovski C.1992.Iterative algorithm for the damped minimum norm,least-squares and con-strained problem in seismic tomography[J].Exploration Geophysics,23(3):497--505.
Zhang H J,Thurber C H.2003.Double-difference tomography:The method and its application to the Hayward fault,California[J].Bull Seism Soc Amer,93(5):1875--1889.
Zhao W J,Nelson K D,Chen J,Quo J,Lu D,Wu C,Liu X.1993.Deep seismic reflection evidence for continental un-derthrusting beneath southern Tibet[J].Nature,366(9):557--559.
陈九辉,刘启元,李顺成,郭飙,赖院根.2005.青藏高原东北缘—鄂尔多斯地块地壳上地幔S波速度结构[J].地球物理学报,48(2):333--342.
丁韫玉,狄秀岭,袁志祥,薛广盈.2000.渭河断陷地壳三维S波速度结构和vP/vS分布图像[J].地球物理学报,43(2):194--202.
嘉世旭,张先康.2005.华北不同构造块体地壳结构及其对比研究[J].地球物理学报,48(3):611--620.
江为为,郝天珧,胥颐,刘振峰,朱东英,涂广红.2007.中国中南地区综合地质地球物理研究[J].地球物理学报,50(1):171--183.
雷建设,周蕙兰,赵大鹏.2002.帕米尔及邻区地壳上地幔P波三维速度结构的研究[J].地球物理学报,45(6):802--811.
吕作勇,吴建平.2010.华北地区地壳上地幔三维P波速度结构[J].地震学报,32(1):1--11.
郭飚,刘启元,陈九辉,赵大鹏,李顺成,赖院根.2004.青藏高原东北缘—鄂尔多斯地壳上地幔地震层析成像研究[J].地球物理学报,47(5):790--797.
唐小平,白超英.2009a.最短路径算法下三维层状介质中多次波追踪[J].地球物理学报,52(10):2635--2643.
唐小平,白超英.2009b.最短路径算法下二维层状介质中多次波追踪[J].地球物理学进展,24(6):2087--2096.
王志铄,王椿镛,曾融生,王溪莉.2008.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,17(2):15--27.
曾融生,丁志峰,吴庆举.1998.喜马拉雅—祁连山地壳构造与大陆—大陆碰撞过程[J].地球物理学报,41(1):49--60.
Bai C Y.2004.Three-Dimensional Seismic Kinematic Inversion with Application to Reconstruction of the VelocityStructure of Rabaul Volcano[D].Australia:The University of Adelaide.
Bai C Y,Greenhalgh S.2006.3Dlocal earthquake hypocenter determination with an irregular shortest path method[J].Bull Seism Soc Amer,96(6):2257--2268.
Bai C Y,Greenhalgh S.2005a.3-D multi-step travel time tomography:Imaging the local,deep velocity structure ofRabaul volcano,Papua New Guinea[J].Phys Earth Planet Interi,151(3--4):259--275.
Bai C Y,Greenhalgh S.2005b.3-D non-linear travel time tomography:Imaging high contrast velocity anomalies[J].Pure Appl Geophys,162(11):2029--2049.
Bai C Y,Greenhalgh S,Zhou B.2007.3Dray tracing using a modified shortest path method[J].Geophysics,72(4):T27--T36.
Bai C Y,Tang X P,Zhao R.2009.2-D/3-D multiply transmitted,converted and reflected arrivals in complex layeredmedia with the modified shortest path method[J].Geophys J Inter,179(1):201--214.
Bai C Y,Huang G J,Zhao R.2010.2-D/3-D irregular shortest-path ray tracing for multiple arrivals and its applications[J].Geophys J Inter,183(3):1596--1612.
Bullen K E.1963.An Introduction to the Theory of Seismology[M].Cambridge:Cambridge University Press:189--217.
Inoue H,Fukao Y,Tanabe K,Ogata Y.1990.Whole mantle P-wave travel time tomography[J].Phys Earth Planet In-teri,59(4):294--328.
McNamara D E,Walter W R,Owens T J,Ammon C J.1997.Upper mantle velocity structure beneath the Tibetan Plat-eau[J].J Geophys Res,102(B1):493--505.
Scales J A.1987.Tomographic inversion via the conjugate gradient method[J].Geophysics,52(2):179--185.
Wang C Y,Han W B,Wu J P,Lou H,Chan W W.2007.Crustal structure beneath the eastern margin of the TibetanPlateau and its tectonic implications[J].J Geophys Res,112(B7):1--21.
Zhou B,Greenhalgh S,Sinadinovski C.1992.Iterative algorithm for the damped minimum norm,least-squares and con-strained problem in seismic tomography[J].Exploration Geophysics,23(3):497--505.
Zhang H J,Thurber C H.2003.Double-difference tomography:The method and its application to the Hayward fault,California[J].Bull Seism Soc Amer,93(5):1875--1889.
Zhao W J,Nelson K D,Chen J,Quo J,Lu D,Wu C,Liu X.1993.Deep seismic reflection evidence for continental un-derthrusting beneath southern Tibet[J].Nature,366(9):557--559.
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