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Magma and Volatile Pathways Beneath Sakurajima Volcano From Self‐Potential, Helium Isotopes, and Broadband Magnetotellurics
https://nied-repo.bosai.go.jp/records/7494
https://nied-repo.bosai.go.jp/records/749463974447-626f-428e-a906-e560fa16c0e4
| Item type | researchmap(1) | |||||||||||||||
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| 公開日 | 2026-04-20 | |||||||||||||||
| タイトル | ||||||||||||||||
| 言語 | en | |||||||||||||||
| タイトル | Magma and Volatile Pathways Beneath Sakurajima Volcano From Self‐Potential, Helium Isotopes, and Broadband Magnetotellurics | |||||||||||||||
| 言語 | ||||||||||||||||
| 言語 | eng | |||||||||||||||
| 著者 |
K. Aizawa
× K. Aizawa
× T. Koyama
× H. Hase
× M. Uyeshima
× H. Sumino
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| 抄録 | ||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||
| 内容記述 | At frequently erupting volcanoes, magma and volatiles ascend through established pathways, but the complete picture of their branching and supply system remains unclear. We integrated self‐potential (SP), broadband magnetotelluric (MT), and helium isotope observations to image magma and volatile pathways beneath Sakurajima Volcano. SP surveys delineate zones of groundwater flow and hydrothermal alteration, MT data reveal a columnar conductive zone (C1), and high <sup>3</sup> He/ <sup>4</sup> He ratios indicate magmatic volatiles. C1 is offset eastward and inclines northward with depth, coinciding with high <sup>3</sup> He/ <sup>4</sup> He locations. Active craters, pressure sources, and deep low‐frequency earthquakes align along edge of C1, supporting an edge‐ascent model in which magma and volatiles preferentially rise along conductor boundaries while volatiles branched at shallow level are laterally guided by shallow groundwater flow. Interpreting C1 as a large, long‐lived magmatic reservoir dominated by crystal mush, we propose that geodetically detected pressure sources represent small, transient magma pockets developing along its edges. | |||||||||||||||
| 言語 | en | |||||||||||||||
| 書誌情報 |
en : Geophysical Research Letters 巻 53, 号 8, 発行日 2026-04-10 |
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| 言語 | en | |||||||||||||||
| 出版者 | American Geophysical Union (AGU) | |||||||||||||||
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| 収録物識別子タイプ | EISSN | |||||||||||||||
| 収録物識別子 | 1944-8007 | |||||||||||||||
| DOI | ||||||||||||||||
| 関連識別子 | 10.1029/2025gl120131 | |||||||||||||||
