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| | Abstract | | JJY standard electromagnetic wave is more stable than VLF wave, so that we can map underground structures with the date in broad area by continuous VLF method using JJY wave. The 2D records in wide area propose great advance to interpret observed resistivity distributions. In our study, we applied numerical analysis and estimated characteristics of underground responses of JJY waves to evaluate the availability of JJY standard electromagnetic wave for structural exploration as a VLF method. We used electromagnetic wave of 20 kHz as a VLF wave and 40 and 60 kHz as JJY standard electromagnetic wave and evaluated resolution performance, skin depth and influence of the geometry between an anomalous structure and a source direction at the condition of propagating electromagnetic wave of each frequency. In the results, we declare that JJY wave has enough performance to survey resistivity distribution to map the tilt of ellipse which is drawn by the amplitude and phase of primal magnetic field of Hy and second magnetic field of Hz, and the exploration using JJY wave has higher resolution performance but lower survey depth than that using VLF wave. |
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