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| | Abstract | | SEGJ Airborne Geophysics Research Committee has evaluated the procedure of data measurements and processing of HELITEM survey for geothermal exploration in Japan under contract with JOGMEC. We, aeromagnetic survey subcommittee, conducted an evaluation concerning aeromagnetic data of the Niseko and Hachimantai areas, northern Japan. First, data processing method at GSJ was applied to the observed magnetic data and magnetic anomalies were reduced onto the smoothed surface. Then, magnetization intensity mapping was conducted assuming terrain models composed of prisms with topographic surfaces and flat bottoms magnetized in a direction of the present Earth's magnetic field. The resultant magnetization intensity maps indicate detailed characteristics of magnetization distributions in the study areas. In the Hachimantai area, magnetization highs lie on Quaternary volcanic rocks which are normally magnetized, generally. However negative magnetizations are dominant on some areas such as northwest of Shibakura-dake, northeastern part of the eastern Hachimantai and south of Akita-Yakeyama volcano where reversely magnetized volcanic rocks are exposed. |
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