| 论绕射波机制 |
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| 引用本文： | 黄洪泽.论绕射波机制[J].地球物理学报,1977,20(1):81-88. |
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| 作者姓名： | 黄洪泽 |
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| 摘 要： | 本文讨论一项用以研究折射绕射波的三度空间超声波模拟实验的结果。实验说明,在三度空间中,在某一点观测到的绕射波包含着来自无穷个绕射源的波涟,这些绕射源沿着绕射楔或断层而分布。这点在观测点位于垂直绕射楔或断层的方向上也是同样真实。 结果也指出绕射波的动力学性质随着绕射楔或断层的几何形状而变化,因此根据这种结果可以设想,若详细研究绕射波的动力学特性,可以对绕射楔或断层的几何形状得出有用的证据。 此外,根据模拟实验的结果,可用“最小走程原理”来解释波涟到达观测点的行程和求得绕射点的位置。
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| 关 键 词： | 绕射波 绕射点 分量 接收点 隔音屏 中心点 时距曲线 绕射源 对绕 到达时间 |
THE MECHANISM OF DIFFRACTED WAVES |
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| HUANG HONG-ZE.THE MECHANISM OF DIFFRACTED WAVES[J].Chinese Journal of Geophysics,1977,20(1):81-88. |
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| Authors: | HUANG HONG-ZE |
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| Abstract: | This paper deals with the results of a three-dimensional ultrasonic wave model experiment designed to study the mechanism of refractional diffracted waves. It has been shown that in the three-dimensional space, diffractions observed at any surface point, consist of wavelets diffracted from an infinite number of diffraction sources, which are distributed along the wedge of diffraction or the fault. This point is also true in case the observation is along the direction perpendicular to the wedge or fault.It is pointed out, that the dynamic nature of diffraction varies with the geometrical nature of the wedge or fault. Therefore, on the basis of this result, we can suppose that by studying the dynamic nature of diffraction in detail, some useful indications in regard to the geometry of the wedge or fault may be obtained.In addition, according to the results of the model experiment, the path of a diffractional wavelet reaching an observation point and position of the diffracting point can be shown by the "Principle of Least Time or Path". |
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