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| | Abstract | | The Geological Survey of Japan, AIST has been conducting geophysical surveys to better understand the geology and/or active fault systems of the transition zone of the Japanese Islands since 2009. During the project, a helicopter-borne stinger-mounted magnetic survey system was developed for AS350B on a basis of our past experience for SA315B. The main renewals are a navigation system (AG-NAV LiNav) which is capable of 3D navigation and a new GNSS receiver (Novatel ProPak 6) with dual-frequency receptions of GPS and GLONASS signals. The data processing method including compensation of aircraft's magnetic noise field was also reorganized for high-resolution aeromagnetic data. The system has been employed for surveys over the transition zone of model fields (Tomakomai, Suruga Bay and Sagami Bay) and the compiled aeromagnetic data has provided new information on the geologic and subsurface structures which were not expected from pre-existing regional aeromagnetic data. |
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