本文提出用于地下成像无源地震方法的分析，在该方法中应用环境地震噪声作为地下散射体的照明源。
An analysis of a passive seismic method for subsurface imaging is presented in which ambient seismic noise is employed as the source of illumination of subsurface scatterers.
而日本的激光干涉管直接修建在地下并维持极低的温度，以降低散射带来的波动。
The interferometer in Japan is being built underground and will be kept at extremely low temperatures to minimise stray vibrations. There are also plans to refine existing experiments.
本文论述了FD-TD法用于计算地下浅层目标的电磁散射问题。
The electromagnetic scattering by buried objects in dispersive media is calculated by FD-TD method.
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