The VLF character for the fault zone was discussed. It is pointed that the effectiveness and limitation of searching blind fault with VLF method.
本文分析了该构造的VLF响应特点，指出在本区用VLF方法寻找隐伏构造的有效性和局限性。
The propagation characteristic of the VLF in the earth-ionosphere waveguide is analyzed by applying the FDTD method.
应用时域有限差分（FDTD）方法分析甚低频在地电离层波导中的传播特性。
The very low frequency electromagnetic method (VLF-EM) has such advantages as portable instrument, simple method, economical and high efficiency.
甚低频电磁法(VLF - EM)，具有仪器轻便、方法简单、经济高效等优点。
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