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Report No.

Reliable measurement method to reveal a peculiar dielectric dispersion in wet rocks by means of ACROSS

Matsumoto, Hiroshi*; Shigeta, Naotaka; Kumazawa, Mineo; Nakajima, Takahiro

Precise and reliable method for complex dielectric permittivity measurement was developed using the data processing method of ACROSS(Accurately controlled Routinely Operated Signal System) and aids in electric circuit and electrode installation to reduce bias in measurement. By using the method, we succeeded to clarify that moist quartz grains and glass beads causes such strong dielectric dispersion that dielectlic permittivity increases in reciprocal proportion to frequency, and exceeds 1.0E5 at 1mHz. Loss angle was of the order of 1.0E-2 radian relatively independent to frequency, which suggests possibility that moist crust has significant dielectricity that can be detected by EM prospecting method in future.



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