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JDR Vol.17 No.5 pp. 644-653
(2022)
doi: 10.20965/jdr.2022.p0644

Paper:

Magnetization Structure and its Temporal Change of Miyakejima Volcano, Japan, Revealed by Uncrewed Aerial Vehicle Aeromagnetic Survey

Takao Koyama*,†, Takayuki Kaneko*, Takao Ohminato*, Atsushi Watanabe*, Yoshiaki Honda**, Takahiro Akiyama*, Shinichi Tanaka*, Marceau Gresse*, Makoto Uyeshima*, and Yuichi Morita*,***

*Earthquake Research Institute, The University of Tokyo
1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan

Corresponding author

**Center for Environmental Remote Sensing, Chiba University, Chiba, Japan

***National Research Institute for Earth Science and Disaster Resilience (NIED), Tsukuba, Japan

Received:
January 15, 2022
Accepted:
June 1, 2022
Published:
August 1, 2022
Keywords:
aeromagnetic survey, Miyakejima, magnetization intensity model, multirotor drone, uncrewed helicopter
Abstract

Miyakejima volcano experienced its latest eruption in 2000 with the summit subsidence, and the next event is expected in the near future. An aeromagnetic survey in Miyakejima was conducted in March 2021 in order to investigate the current state of its magnetization structure to identify the potential for another eruption and, thus, mitigate volcanic disaster. The survey flight was conducted using an uncrewed aerial vehicle (UAV), a multirotor drone, to deploy a scalar magnetometer. After processing geomagnetic field data from this survey, in combination with data from previous surveys conducted by using another UAV, an uncrewed helicopter, the average magnetization intensity was determined to be 12.4 A/m. Further, the surrounding area of the crater was relatively highly magnetized; however, the crater rim had a low magnetization intensity. Temporal variation was detected between 2014 and 2021 and dominated the central part of the observation area. Decreased magnetization intensity was identified beneath the caldera, which may become recently demagnetized due to heat supply traveling through fractures in the impermeable layer from the deep heat reservoir.

Cite this article as:
T. Koyama, T. Kaneko, T. Ohminato, A. Watanabe, Y. Honda, T. Akiyama, S. Tanaka, M. Gresse, M. Uyeshima, and Y. Morita, “Magnetization Structure and its Temporal Change of Miyakejima Volcano, Japan, Revealed by Uncrewed Aerial Vehicle Aeromagnetic Survey,” J. Disaster Res., Vol.17, No.5, pp. 644-653, 2022.
Data files:
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Last updated on Dec. 01, 2022