多次反射折射波的传播路径研究
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摘要
本文通过对多次反射折射波的运动学和动力学特性分析,在多次反射折射波传播路径分析的基础上,概括出两种可能的传播路径:经震源激发后,检波器接收到的地震波为经多次反射后产生的一次折射波(路径Ⅰ)及一次折射波经多次反射后产生的反射波(路径Ⅱ)。通过对多次反射折射波传播路径的分析和归纳,利用半空间模型和波导模型进行了谱元法正演模拟,结果表明,记录到的多次反射折射波为先在震源附近发生多次反射,然后在波导层发生折射,因此路径Ⅰ为多次反射折射波的实际传播路径。
Based on the analysis of kinematic and dynamic characteristics of multiple refracted reflections,two possible propagation paths of multiple refracted reflections are summarized in this paper through the deductions of propagation paths.For Path I,the received waves are refractions after multiple reflections,and for Path II,the received waves are reflections after refraction waves reflected several times.Through the analysis and induction of the possible propagation paths,two possible propagation paths are verified by the spectral element forward modeling method based on a half-space model and a wave guide model,and the actual propagation Path I is approved by the results of modeling,which means the incident waves reflected several times initially near the source and generate refractions in the wave guide layer.
Based on the analysis of kinematic and dynamic characteristics of multiple refracted reflections,two possible propagation paths of multiple refracted reflections are summarized in this paper through the deductions of propagation paths.For Path I,the received waves are refractions after multiple reflections,and for Path II,the received waves are reflections after refraction waves reflected several times.Through the analysis and induction of the possible propagation paths,two possible propagation paths are verified by the spectral element forward modeling method based on a half-space model and a wave guide model,and the actual propagation Path I is approved by the results of modeling,which means the incident waves reflected several times initially near the source and generate refractions in the wave guide layer.
引文
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[2]Vlastislavervenand Ravindra R.Theory of Seis-mic Head Waves.Univ of Toronto Press,1971
[3]Vlastislaverven.Amplitudes of reflected and headwaves in the presence of a stratified overlying rockmass.Earth Phys,1968,(3):153～160
[4]Smirnova N S.Calculation of wave fields in the neigh-bourhood of singular points.G I Patrashen,1962,(6):30～59
[5]Cagniard L.Reflection and Refraction of Progres-sive Seismic Waves.Mc Graw-Hill,New York
[6]Lanin A L.Investigation of Interference WaveFields in Problems of Diffraction by a TransparentCylinder and an Elastic Sphere[D].Leningrad Uni-versity,1966
[7]VlastislavˇCerven.A study of the amplitudes of headwaves.Studia Geopjys et Geod,1957,(3):256～284
[8]郭朝斌,李振春等.陆地多次反射折射波定量分析.中国石油大学学报(自然科学版),2011,31(1):45～51Guo Chaobin,Li Zhenchun et al.Quantitative analysisof multiple reflected refraction of land.Journal ofChina University of Petroleum(Edition of NaturalScience),2011,31(1):45～51
[9]Jose M Carcione,Gerard C Hermanz,A P E tenKroode.Seismic modeling.Geophysics,2002,67(4):1304～1325
[10]Huang Jianping,Elizabeth Vanacore,Niu Fenglin,Al-an Levander.Mantle transition zone beneath the Ca-ribbean-South American plate boundary and its tec-tonic implications.Earth and Planetary Science Let-ters,2010,289:105～111
[11]Komatitsch D,Tromp J.Introduction to the spectralelement method for three dimensional seismic wavepropagation.Geophysics,1999,139(2):806～822
[12]Komatitsch D,Ritsema J,Tromp J.The spectral-ele-ment method,Beowulf computing,and global seis-mology.Science,2002,298(5599):1737～1742
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