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Report No.
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Applicability of airborne geophysics (DighemV) in a granite area, 1; Airborne electromagnetic survey

Hasegawa, Ken; Matsuoka, Toshiyuki; Yuki, Yoichi*

An airborne electromagnetic survey was conducted in the region of the Toki granite. The resistivity of the Toki granite about is about 5000 $$Omega$$m while the resistivity of the Mizunami Group and the Seto Group which overlie the Toki granite is tens of $$Omega$$m. Due to processing limitation, this large contrast in resistivity was not included in past calculations of apparent resistivity. A new calculation method for apparent resistivity was developed, and data was reprocessed. As a result, the regions where the thickness of the Mizunami and/or the Seto Group is thin (the depth of the Toki granite is shallow) and the regions where the Toki granite is deep were clearly identified.

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