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Report No.

Long-Term Operation of EM-ACROSS and Derived Transfer Function in the Diffusion Field Region

Nakajima, Takahiro; Kunitomo, Takahiro; Nagao, Hiromichi; Kumazawa, Mineo; Shigeta, Naotaka

We have developed and tested a new electromagnetic sounding method, which is called EM-ACROSS (ElectroMagnetic - Accurately Controlled Routinely Operated Signal System). This system is designed for the survey below 500 Hz. We carried out a field test using this system at Tono area, and acquired very accurate transfer function between the source and receiver which the distance is about 700 m. From the phase of the transfer function for a month, we can see the correlation with the rainfall.



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