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An aeromagnetic survey using an unmanned aerial vehicle over Azuma Volcano, NE Japan

Urheber*innen

Yonekura,  Hikari
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ichiki,  Masahiro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Okuma,  Shigeo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Miyakawa,  Ayumu
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Tanaka,  Ryo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kaidao,  Toshiki
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ayuta,  Tsuge
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ohta,  Toyonobu
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hashimoto,  Takeshi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Zitation

Yonekura, H., Ichiki, M., Okuma, S., Miyakawa, A., Tanaka, R., Kaidao, T., Ayuta, T., Ohta, T., Hashimoto, T. (2023): An aeromagnetic survey using an unmanned aerial vehicle over Azuma Volcano, NE Japan, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2319


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018437
Zusammenfassung
The volcanic alteration zone at a depth of several hundred meters below the surface is a key feature to assess the degree of the imminence of phreatic eruption; Recent magnetotelluric images indicate that the conductive alteration zone prevents hypocenters of volcanic earthquakes from reaching the surface（Tsukamoto et al., 2018; Tseng et al., 2020; Gresse et al., 2021). A phreatic eruption could occur, when the hypocenters pass through the conducting layer. To approach the surface alteration zone and demagnetized area in the active volcanic edifice, a total intensity aeromagnetic survey using an unmanned aerial vehicle was carried out in 1×2.5 km over Oana Crater, with now on active fumaroles inside, of Mt. Azuma, NE Japan. The original magnetic anomaly distribution was obtained using Nakatsuka and Okuma (2006) with correcting the main field (IGRF-13) and the diurnal variations. The average magnetization intensity (AMI) was 2.06 A/m estimated by a statistical correlation method (Grauch 1987). After subtracting the contribution of the average magnetization from the original magnetic anomaly, the resultant magnetic anomaly data were inverted into a three-dimensional subsurface magnetization perturbation from AMI using the effective source volume minimization method (Nakatsuka and Okuma, 2014). The result shows a weakly magnetized region below the Tsubakurozawa Crater, where the past eruption occurred in 1893, 1896, juxtaposed with Oana Crater. The weakly magnetized location coincides with the demagnetization source location modeled by using the repeating total magnetic intensity observations (Japan Meteorological Agency, 2020).