设置深度偏移。
Long offset transient electromagnetics (LOTEM) is characterized by the fact that the distance between transmitter and receiver is equal to or longer than exploration depth.
长偏移距瞬变电磁法(LOTEM)的特点是发射器与接收器之间的距离大于或等于勘探深度。
From the analysis of calculating results it can be seen that the greater depth explored with the smaller offset in the TEM sounding could be achieved.
从计算结果分析可知，瞬变电磁测深可实现较小极距探测较大深度。
Given the velocity ratio of S-to P-waves, the depth of reflector and the offset, the horizontal distance between source and the converting point can be determined by solving a quartic equation.
如果我们已知介质中横波与纵波速度的比值、水平界面的埋藏深度和炮检距，炮点到共转换点的水平距离就可以通过解一个四次方程求出。
Given the velocity ratio of S-to P-waves, the depth of reflector and the offset, the horizontal distance between source and the converting point can be determined by solving a quartic equation.
如果我们已知介质中横波与纵波速度的比值、水平界面的埋藏深度和炮检距，炮点到共转换点的水平距离就可以通过解一个四次方程求出。
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