二维速度结构走时反演RAYINVR算法试验
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摘要
为分析RAYINVR算法对成像结果的影响,分别从初始模型、观测数据、阻尼因子和识别误差4个方面进行数值试验。结果表明,该程序能够进行快速有效的反演,初始模型、观测数据、阻尼因子、数据不确定性等对反演结果和分辨率有一定的影响。
RAYINVR is an inversion algorithm for calculating two-dimensional velocity structure based on seismic wave traveltime.It consists of 3parts,including model parameterization,ray tracing and damped least squares inversion.In order to analyze the influence factors of the algorithm on the imaging results,numerical experiments are analyzed from the four aspects of the initial model,observation data,damping factor and identification errors.The results show that the program can be performed quickly with efficient inversion.Meanwhile,the initial model,observation data,damping factor,identification errors,and so on,have an impact on the results of inversion and resolution.
RAYINVR is an inversion algorithm for calculating two-dimensional velocity structure based on seismic wave traveltime.It consists of 3parts,including model parameterization,ray tracing and damped least squares inversion.In order to analyze the influence factors of the algorithm on the imaging results,numerical experiments are analyzed from the four aspects of the initial model,observation data,damping factor and identification errors.The results show that the program can be performed quickly with efficient inversion.Meanwhile,the initial model,observation data,damping factor,identification errors,and so on,have an impact on the results of inversion and resolution.
引文
[1]Cerveny V,Molotkov I A,Molotkov I A,et al.Ray Method in Seismology[M].Prague:University of Karlova,1977
[2]Zelt C A,Smith R B..Seismic Traveltime Inversion for 2-D Crustal Velocity Structure[J].Geophys J Int,1992,108(1):16-34
[3]Zelt C A,Ellis R M.Practical and Efficient Ray Tracing in Two-Dimensional Media for Rapid Traveltime and Amplitude Forward Modelling[J].Canadian Journal of Exploration Geophysics,1988,24(1):16-31
[4]Braun J A,Smith R B.Two-Dimensional Inversion for Crustal Structure Using Refraction/Wide-Angle Reflection Data from the 1986 PASSCAL:Basin-Range Experiment[J].EOS Trans Am Geophys Un,1989,70:1 206
[5]Huang H,Spencer C,Green A.A Method for the Inversion of Refraction and Reflection Travel Times for Laterally Varying Velocity Structures[J].Bulletin of the Seismological Society of America,1986,76(3):837-846
[6]Lutter W J,Nowack R L.Inversion for Crustal Structure Using Reflections from the PASSCAL Ouachita Experiment[J].J Geophys Res,1990,95(B4):4 633-4 646
[7]王夫运,张先康,杨卓欣,等.用地震走时反演长白山天池火山地区的二维地壳结构[J].地震学报,2002,24(2):143-152(Wang Fuyun,Zhang Xiankang,Yang Zhuoxin,et al.2-D Crustal Structure of Changbaishan-Tianchi Volcanic Region Determined by Seismic Travel Time Inversion[J].Earthquake Science,2002,24(2):143-152)
[2]Zelt C A,Smith R B..Seismic Traveltime Inversion for 2-D Crustal Velocity Structure[J].Geophys J Int,1992,108(1):16-34
[3]Zelt C A,Ellis R M.Practical and Efficient Ray Tracing in Two-Dimensional Media for Rapid Traveltime and Amplitude Forward Modelling[J].Canadian Journal of Exploration Geophysics,1988,24(1):16-31
[4]Braun J A,Smith R B.Two-Dimensional Inversion for Crustal Structure Using Refraction/Wide-Angle Reflection Data from the 1986 PASSCAL:Basin-Range Experiment[J].EOS Trans Am Geophys Un,1989,70:1 206
[5]Huang H,Spencer C,Green A.A Method for the Inversion of Refraction and Reflection Travel Times for Laterally Varying Velocity Structures[J].Bulletin of the Seismological Society of America,1986,76(3):837-846
[6]Lutter W J,Nowack R L.Inversion for Crustal Structure Using Reflections from the PASSCAL Ouachita Experiment[J].J Geophys Res,1990,95(B4):4 633-4 646
[7]王夫运,张先康,杨卓欣,等.用地震走时反演长白山天池火山地区的二维地壳结构[J].地震学报,2002,24(2):143-152(Wang Fuyun,Zhang Xiankang,Yang Zhuoxin,et al.2-D Crustal Structure of Changbaishan-Tianchi Volcanic Region Determined by Seismic Travel Time Inversion[J].Earthquake Science,2002,24(2):143-152)