LI QINGHE, ZHOU MINDU, LI LIUYUcom iasic personality . 1988: THE DIFFRACTED WAVE AT A FAULT AND ITS APPLICATION. Acta Seismologica Sinica, 10(4): 363-374.
Citation: LI QINGHE, ZHOU MINDU, LI LIUYUcom iasic personality . 1988: THE DIFFRACTED WAVE AT A FAULT AND ITS APPLICATION. Acta Seismologica Sinica, 10(4): 363-374.

THE DIFFRACTED WAVE AT A FAULT AND ITS APPLICATION

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  • Published Date: September 01, 2011
  • According to the physical definition of diffracted wave, the solution of Kirchhoff-Helm-holtz diffraction equation at a fault give by Trorey is simplified and developed. Synthetic seismograms of diffracted wave at a fault of different depths and from different directions to the profile are computed, and compared with corresponding reflected wave. The amplitude spectrum and phase spectrum of diffracted wave on both sides of a fault are computed. Some usable formulas using diffracted wave along a profile for locating a fault are presented. Two practical examples are given for studying particular characteristics of diffracted wave at a fault.Results indicate that the diffracted wave at a fault originates from an abrupt change in the medium. On both sides of a diffraction point, the travl-time curve of diffracted wave is a hyperbola. The first arrival of the diffracted wave is distinct and with short half-period, and its amplitude spectrum at predominant frequency is similar to that of reflected wave. It is noted that at the tangent point of the travel-time curves of diffracted and reflected waves, the amplitude of the diffrated wave is maximum, but the phase is opposite to that of the reflected wave. The apparent diffracting point does not coincide with the real one. These charateristics might offer a criterion for identifying the diffracted waves and the position of a fault.
  • [1] 边醒建、程继华,地震反射波法勘探小断层的经验,地球物理学报,1965,14,168——375.

    [2] 刘汝腾,断层两侧界面弯曲时反射波的特点,地球物理学报,1966,15,148——157.

    [3] 石油科学研究院,地震勘探记录选集,104——107,1967,科学出版社.

    [4] Trorey, A. W., A simple theory for seismic diffractions, Geophysrcs, 1970 35, 762——784.

    [5] 胜利油田地质处,地震波的基本性质一一复杂断块区的反射波、异常波与干扰波,石油地球物理勘探,1974,9,1——2,21——32.

    [6] 冯锐,T. V. McEvilly,由地震反射波剖面研究圣安德烈斯断层带的结构,地震学报,1984, 6, 249——263.

    [7] Sheriff, R. E., L. P. Geldart, Exploration Seismology VI, 1982, Cambridge University Press.

    [8] 周民都、冯德益,地震波在垂向不均匀介质中传播问题的某些探讨,西北地震学报,1986,8,53——63,

    [9] 胡鸿翔,陈学波,张碧秀,宋文荣,肖志江,何正勤,中国中原地区随县——安阳剖面深地震测深资料的解释,地震学报,1986,8,37——49,

    [1] 边醒建、程继华,地震反射波法勘探小断层的经验,地球物理学报,1965,14,168——375.

    [2] 刘汝腾,断层两侧界面弯曲时反射波的特点,地球物理学报,1966,15,148——157.

    [3] 石油科学研究院,地震勘探记录选集,104——107,1967,科学出版社.

    [4] Trorey, A. W., A simple theory for seismic diffractions, Geophysrcs, 1970 35, 762——784.

    [5] 胜利油田地质处,地震波的基本性质一一复杂断块区的反射波、异常波与干扰波,石油地球物理勘探,1974,9,1——2,21——32.

    [6] 冯锐,T. V. McEvilly,由地震反射波剖面研究圣安德烈斯断层带的结构,地震学报,1984, 6, 249——263.

    [7] Sheriff, R. E., L. P. Geldart, Exploration Seismology VI, 1982, Cambridge University Press.

    [8] 周民都、冯德益,地震波在垂向不均匀介质中传播问题的某些探讨,西北地震学报,1986,8,53——63,

    [9] 胡鸿翔,陈学波,张碧秀,宋文荣,肖志江,何正勤,中国中原地区随县——安阳剖面深地震测深资料的解释,地震学报,1986,8,37——49,

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