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

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J. Geophys. Res.119-1_198-215.pdf12.04 MBPDF見る/開く
この文献へのリンクには次のURLを使用してください:http://hdl.handle.net/2115/67566

タイトル: Three-dimensional resistivity structure and magma plumbing system of the Kirishima Volcanoes as inferred from broadband magnetotelluric data
著者: Aizawa, Koki 著作を一覧する
Koyama, Takao 著作を一覧する
Hase, Hideaki 著作を一覧する
Uyeshima, Makoto 著作を一覧する
Kanda, Wataru 著作を一覧する
Utsugi, Mitsuru 著作を一覧する
Yoshimura, Ryokei 著作を一覧する
Yamaya, Yusuke 著作を一覧する
Hashimoto, Takeshi 著作を一覧する
Yamazaki, Ken'ichi 著作を一覧する
Komatsu, Shintaro 著作を一覧する
Watanabe, Atsushi 著作を一覧する
Miyakawa, Koji 著作を一覧する
Ogawa, Yasuo 著作を一覧する
発行日: 2014年
誌名: Journal of Geophysical Research : Solid Earth
巻: 119
号: 1
開始ページ: 198
終了ページ: 215
出版社 DOI: 10.1002/2013JB010682
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 10km) 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.
Rights: Copyright 2014 American Geophysical Union.
資料タイプ: article
URI: http://hdl.handle.net/2115/67566
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 橋本 武志

 

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