| 混合法计算GB体波理论地震图 |
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| 引用本文： | 全幼黎,滕吉文.混合法计算GB体波理论地震图[J].地球物理学报,1988,31(2):165-175. |
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| 作者姓名： | 全幼黎 滕吉文 |
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| 作者单位： | 中国科学院地球物理研究所 北京 |
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| 摘 要： | 高斯射线束（GB）方法是一种用于计算不均匀介质中波场的高频近似方法。本文在详细讨论了几种用高斯射线束叠加计算理论地震图的方法--频谱法、褶积法和波包法之后,提出了适用范围更广泛的混合方法（褶积-波包法）,并给出了一个便于数值计算的褶积公式。混合法在计算GB理论地震图时既用褶积法又用波包法,可以得到较高的计算速度与精度。最后,就二维情况分别用褶积法、波包法和混合法进行了一些实际计算和比较。
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| 关 键 词： | 理论地震图 高斯射线束 褶积-波包法 不均匀介质 |
| 收稿时间： | 1986-07-18 |
COMPUTATION OF GB BODY WAVE SYNTHETIC SEISMOGRAMS BY A COMBINED METHOD |
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| QUAN YOU-LI TENG JI-WEN.COMPUTATION OF GB BODY WAVE SYNTHETIC SEISMOGRAMS BY A COMBINED METHOD[J].Chinese Journal of Geophysics,1988,31(2):165-175. |
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| Authors: | QUAN YOU-LI TENG JI-WEN |
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| Institution: | Institute of Geophysics, Academia Sinica, Beijing |
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| Abstract: | Gaussian beam (GB) method is a high-frequency asymptotic method of computing wave-fields in inhomogenous media. Three variant methods, the spectral method, the convolutory method and the wave-packet method, to computing synthetic seismograms by Gaussian beam summation, are discussed in detail. A combined method which may be used in Lroader range is suggested. A convolutory equation which may be convenient for numerical calculation is, given. When GB synthetic sesmograms are computed by the combined method, both convqlu-tory method and wave-packet method may be used, in order to get fairly hign calculative accuracy and speed. Numerical examples for 2-D structure by the convolutory method, the wave-packet method and the combined method are presented. |
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| Keywords: | Synthetic seismograms Gaussian beam Wavepacket-Convolutory method Inhomogenous media |
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