转换点

Different from horizontal interface, coordinates of the conversion of converted waves depend on both dip angle and dip direction of a dipping interface.

不同于水平界面，倾斜界面的转换波的转换点坐标轨迹还要取决于界面的倾角和倾向，而且难于用精确的解析表达式表示。

In this paper, we research the imaging problems beneath volcanic area. We sort common asymptotic conversion point gathers and perform velocity analysis to establish the initial velocity which will be used in PSTM. By scanning migration velocity and V p/ V s, we get the optimum migration velocity and

本文针对火山岩地震屏蔽层的转换波成像问题，通过对转换波共近似转换点道集进行速度分析，建立了转换波叠前时间偏移的初始速度场，通过速度扫描和纵、横波速度比值扫描确定最佳的偏移速度场和纵、横波速度比值，实现了在火山岩高速层覆盖区域的转换波偏移成像。

The model experiment shows that Kirchhoff migration can implement effective image of converted phases, remove the fictious image, in contrast to ray_based horizontal common_converted_point stacking method.

模型检验表明，与传统的水平分层的共转换点偏移叠加方法相比，Kirchhoff偏移方法能够实现转换波的有效归位，消除水平分层共转换点偏移叠加造成的假象。

The model experiment shows that Kirchhoff migration can implement effective image of converted phases, remove the fictious image, in contrast to ray-based horizontal common-converted-point stacking method.

模型检验表明，与传统的水平分层的共转换点偏移迭加方法相比，Kirchhoff偏移方法能够实现转换波的有效归位，消除水平分层共转换点偏移迭加造成的假象。

For converted wave stacking and trace selection of common reflection point gathering, it is required to accurately calculate the location of conversion points.

转换波共转换点的叠加和道集选取都需要准确地计算转换点的位置。

We have researched a method of coordinate rotation of 3D converted wave data, binning and calculating 3D converted point, that is to make coordinate rotation for all seismic traces in each gather of converted wave common-shot point.

研究了三维转换波资料坐标旋转、面元划分及三维共转换点计算方法，即将每一个转换波共炮点道集内所有地震道进行坐标旋转，旋转后的转换波道集在炮检距、纵横波速度已知的条件下，用迭代方法计算三维转换点的平面坐标，并绘制在平面上。

The one switch point is to start mixing and the other for stop mixing.

一个转换点是开始混合，一个转换点是停止混合。

We suggest a method abandoning the search for common converted points and adjusting polars, and taking receive point as fictitious source, and using one-way wave equation performance to converted wave migration in shot domain.

抛开常规的转换点位置估计及极性校正，把检波点作为虚拟震源，利用单程波方程实现转换波记录的炮域偏移处理。

Results showed that the common points should distribute evenly in range, the transformation points should not be far away from the common points, and the number of common points selected should be within 3 to 5 to ensure transformation accuracy.

结果表明，为保证坐标转换成果的精度，公共点应均匀地分布在测区，同时转换点不要离公共点太远。公共点的个数以3~5个为宜，一般不要超过6个。

This solution was expressed a function of offset, compressional and shear waves velocities, the traveltime of P-SV converted waves.

Schneider（2002）从一个关于转换点的三次方程中推导出了P-SV转换波转换点位置的一种解析解，这种解是偏移距、横纵波速度和P-SV转换波旅行时的函数。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。