2022 Fiscal Year Final Research Report
Monitoring of the volcanic activity by repeated aeromagnetic observation using drone.
Project/Area Number |
19K04967
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 25030:Disaster prevention engineering-related
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Research Institution | Kyoto University |
Principal Investigator |
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Project Period (FY) |
2019-04-01 – 2023-03-31
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Keywords | 火山磁気変化 / 熱消磁 / 繰り返し空中磁気観測 / 磁場時間変化 / スパース磁気インバージョン |
Outline of Final Research Achievements |
Aeromagnetic observations using a drone were made at Kuju volcano in 2019. By comparing this observation data with the aeromagnetic observation data using a friend's helicopter observed in 2004, we detected temporal changes in the magnetic field (total force) between 2004 and 2019, which may have been caused by the activity of Kokonoe Volcano. For this purpose, we developed a computational scheme for detecting temporal changes in the magnetic field from repeated aeromagnetic observation data at different altitudes and obtained the source location of the detected temporal changes using the sparse inversion technique.The amplitude and pattern of the detected time variation were consistent with the results of ground-based magnetic field observations by Kyoto University and the Japan Meteorological Agency, and the position of the center of gravity of the source of the variation was also consistent with the results obtained from previous ground-based observations.
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Free Research Field |
地球電磁気学
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Academic Significance and Societal Importance of the Research Achievements |
無人機を用いた繰り返し観測から、磁場時間変化を検出する為の計算方法と、その結果得られた磁場時間変化の変化源位置を求める為の計算スキームを構築した。この方法は他の火山地域においても適用可能で、且つ飛行経路や高度が異なるデータにも適用可能な汎用的手法である。磁場変化から推定される地下温度状態の変化は火山活動の推移をモニタリングするための有力な手法の一つであるが、本研究により無人機を用い遠隔からの観測で磁場の時間変化を検出することが可能となったことで、そうした情報を火山活動が活発化した後も継続して取得できるようになった事は、今後の火山防災の観点からも重要な成果である。
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