Seismic and electromagnetic waves are treated as plane waves even though that assumption is not strictly correct.
即使假设并不严格成立，也常把地震波和电磁波看作是平面波。
The method for the exploration of the mined-out areas by using 3D seismic and electromagnetic laws and its effect are introduced.
本文介绍了应用三维地震及电磁法探测采空区边界及含水性的技术方法与地质效果。
The structure, principle of working, primary functions and technical features of the Observation System of DJY-2000B Seismic Electromagnetic Impulse are introduced.
介绍了D JY - 2000b型地震电磁波脉冲观测系统的组成、工作原理、主要功能和技术指标等。
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