無人ヘリコプターを利用した樽前山の空中磁気測量

概要

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The first low-altitude airborne magnetic survey was performed over the summit area ofTarumae Volcano, southwestern Hokkaido, Japan. An unmanned autonomous helicopter was usedas the platform for the magnetic survey. Obtained total field anomaly is inverted into a matrix ofmagnetized prisms, each of which has a uniform magnetization parallel to the present geomagneticfield. Magnetization in the summit atrio ranges from 3 to 8 A/m with an average of 5.3 A/m.The summit lava dome and its vicinity show relatively high magnetization, while the easternto southwestern part of the atrio is less magnetized. Such variability may be attributed to thedifference in magnetization between blocky lava and pyroclastic deposits, as well as to chemicaldemagnetization due to persistent fumarolic activity at several vents. From the viewpoint of anaeromagnetic survey, high positioning repeatability is one of the most advantageous features ofsuch an unmanned autonomous helicopter. Optimized operation of the system would enable us todetect temporal changes associated with volcanic activity in the future.
2012-03-19