Three-dimensional resistivity structure and magma plumbing system of the Kirishima Volcanoes as inferred from broadband magnetotelluric data

Koki Aizawa, Takao Koyama, Hideaki Hase, Makoto Uyeshima, Wataru Kanda, Mitsuru Utsugi, Ryokei Yoshimura, Yusuke Yamaya, Takeshi Hashimoto, Ken'Ichi Yamazaki, Shintaro Komatsu, Atsushi Watanabe, Koji Miyakawa, Yasuo Ogawa

研究成果: ジャーナルへの寄稿記事

27 引用 (Scopus)

抄録

Broadband magnetotelluric (MT) measurements were conducted in 2010 and 2011 in the vicinity of Shinmoe-dake Volcano in the Kirishima volcano group, Japan, where sub-Plinian eruptions took place 3 times during 26-27 January 2011. By combining the new observations with previous MT data, it is found that an anomalous phase in excess of 90° is commonly observed in the northern sector of the Kirishima volcano group. Because the anomalous phase is not explained by 1-D or 2-D structure with isotropic resistivity media, 3-D inversions were performed. By applying small errors to the anomalous phase, we successfully estimated a 3-D resistivity structure that explains not only the normal data but also the anomalous phase data. The final model shows a vertical conductor that is located between a deep-seated conductive body (at a depth greater than 10 km) and a shallow conductive layer. By applying the findings of geophysical and petrological studies of the 2011 sub-Plinian eruptions, we infer that the subvertical conductor represents a zone of hydrothermal aqueous fluids at temperatures over 400°C, in which a magma pathway (interconnected melt) is partially and occasionally formed before magmatic eruptions. To the north of the deep conductor, earthquake swarms occurred from 1968 to 1969, suggesting that these earthquakes were caused by volcanic fluids.

元の言語英語
ページ(範囲)198-215
ページ数18
ジャーナルJournal of Geophysical Research: Solid Earth
119
発行部数1
DOI
出版物ステータス出版済み - 1 2014

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Magnetotellurics
Plumbing
Volcanoes
volcanoes
volcanic eruptions
magma
plinian eruption
electrical resistivity
volcano
conductors
broadband
Earthquakes
earthquakes
earthquake swarm
Fluids
fluid
fluids
volcanology
Japan
sectors

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

これを引用

Three-dimensional resistivity structure and magma plumbing system of the Kirishima Volcanoes as inferred from broadband magnetotelluric data. / Aizawa, Koki; Koyama, Takao; Hase, Hideaki; Uyeshima, Makoto; Kanda, Wataru; Utsugi, Mitsuru; Yoshimura, Ryokei; Yamaya, Yusuke; Hashimoto, Takeshi; Yamazaki, Ken'Ichi; Komatsu, Shintaro; Watanabe, Atsushi; Miyakawa, Koji; Ogawa, Yasuo.

:: Journal of Geophysical Research: Solid Earth, 巻 119, 番号 1, 01.2014, p. 198-215.

研究成果: ジャーナルへの寄稿記事

Aizawa, K, Koyama, T, Hase, H, Uyeshima, M, Kanda, W, Utsugi, M, Yoshimura, R, Yamaya, Y, Hashimoto, T, Yamazaki, KI, Komatsu, S, Watanabe, A, Miyakawa, K & Ogawa, Y 2014, 'Three-dimensional resistivity structure and magma plumbing system of the Kirishima Volcanoes as inferred from broadband magnetotelluric data', Journal of Geophysical Research: Solid Earth, 巻. 119, 番号 1, pp. 198-215. https://doi.org/10.1002/2013JB010682
Aizawa, Koki ; Koyama, Takao ; Hase, Hideaki ; Uyeshima, Makoto ; Kanda, Wataru ; Utsugi, Mitsuru ; Yoshimura, Ryokei ; Yamaya, Yusuke ; Hashimoto, Takeshi ; Yamazaki, Ken'Ichi ; Komatsu, Shintaro ; Watanabe, Atsushi ; Miyakawa, Koji ; Ogawa, Yasuo. / Three-dimensional resistivity structure and magma plumbing system of the Kirishima Volcanoes as inferred from broadband magnetotelluric data. :: Journal of Geophysical Research: Solid Earth. 2014 ; 巻 119, 番号 1. pp. 198-215.
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abstract = "Broadband magnetotelluric (MT) measurements were conducted in 2010 and 2011 in the vicinity of Shinmoe-dake Volcano in the Kirishima volcano group, Japan, where sub-Plinian eruptions took place 3 times during 26-27 January 2011. By combining the new observations with previous MT data, it is found that an anomalous phase in excess of 90° is commonly observed in the northern sector of the Kirishima volcano group. Because the anomalous phase is not explained by 1-D or 2-D structure with isotropic resistivity media, 3-D inversions were performed. By applying small errors to the anomalous phase, we successfully estimated a 3-D resistivity structure that explains not only the normal data but also the anomalous phase data. The final model shows a vertical conductor that is located between a deep-seated conductive body (at a depth greater than 10 km) and a shallow conductive layer. By applying the findings of geophysical and petrological studies of the 2011 sub-Plinian eruptions, we infer that the subvertical conductor represents a zone of hydrothermal aqueous fluids at temperatures over 400°C, in which a magma pathway (interconnected melt) is partially and occasionally formed before magmatic eruptions. To the north of the deep conductor, earthquake swarms occurred from 1968 to 1969, suggesting that these earthquakes were caused by volcanic fluids.",
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AU - Uyeshima, Makoto

AU - Kanda, Wataru

AU - Utsugi, Mitsuru

AU - Yoshimura, Ryokei

AU - Yamaya, Yusuke

AU - Hashimoto, Takeshi

AU - Yamazaki, Ken'Ichi

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AU - Watanabe, Atsushi

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