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正常时差的方程式 t~2=t_o~2+x~2/V_a~2,可用于来自单一均质和各向同性层的反射.但它在实际多层、不均质介质及弯曲界面领域中只是一种近似计算。如果应用几何光学理论,则我们能发现另外的二阶方程。该方程可用来说明时间座标轴范围内对称的双曲线。但这些双曲线中心不在座标中心,而是在时间座标轴上。说明第二种双曲线的方程是(t+t_p-t_o)~2=t_p~2+x~2/V_l~2式中 t_p 是聚焦深度的时间,V_l是输入的速度。这个方程不仅要比常规正常时差精确,而且它在矢量计算机上也是比较节时的。因为一般动校正在 t_p 分析中是一种静校正。利用这个方法就使计算所有叠加道的各种试样
The normalized time difference equation, t ~ 2 = t_o ~ 2 + x ~ 2 / V_a ~ 2, can be used for reflection from a single homogeneous and isotropic layer, but in the realm of multilayer, heterogeneous media and curved interfaces Just an approximation. If we apply the theory of geometrical optics, we can find another second-order equation. This equation can be used to illustrate a hyperbolic symmetry within the time axis. However, these hyperbolic centers are not at the center of the coordinates but at the time axis. The second hyperbolic equation is (t + t_p-t_o) ~ 2 = t_p ~ 2 + x ~ 2 / V_l ~ 2 where t_p is the depth of focus time and V_l is the input speed. This equation is not only more accurate than the normal normal time difference, but it is also time-saver on a vector computer. Because the general dynamic correction t_p analysis is a static correction. With this method, all the samples of all superimposed tracks are calculated