In field practice, a subsurface is mapped by arranging a series of wave-train sources, such as small dynamite explosions, in a grid pattern…
第二句话对解释进行总的说明：“在实地作业中，通过将一系列波列源，诸如小规模炸药爆炸，排列成一个网格模式，从而将地下层面标绘出来。” 接下来是“地震反射法”的详细过程。
The two cross correlations sum up to realize plane wave imaging at subsurface.
二者互相关求和，实现平面波地下波场成像。
Wave equation time migration fails to image subsurface geological structure correctly in the case of obvious lateral seismic velocity variation.
当介质的速度在横向上存在较大的变化时，波动方程时间偏移不能使地下的构造正确成像。
The high frequency part of seismic wave propagation in subsurface is easy to be absorbed or attenuated.
地震波在地下介质中传播时，高频成分易被吸收。
A basic scheme for detecting subsurface targets with em pulse of nanoseconds and an especially developed travelling-wave antenna of high quality are described.
本文描述了纳秒电磁脉冲在探测地下目标中的基本方案；研制了一种高质量行波天线。
A basic scheme for detecting subsurface targets with em pulse of nanoseconds and an especially developed travelling-wave antenna of high quality are described.
本文描述了纳秒电磁脉冲在探测地下目标中的基本方案；研制了一种高质量行波天线。
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