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Hydrothermal and Magmatic System of a Volcanic Island Inferred From Magnetotellurics, Seismicity, Self-potential, and Thermal Image: An Example of Miyakejima (Japan)
https://nied-repo.bosai.go.jp/records/2882
https://nied-repo.bosai.go.jp/records/2882814b3be2-3e6b-4c3e-903e-953e729d2967
| Item type | researchmap(1) | |||||||||||||||||||||||||||||||||||
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| 公開日 | 2023-03-30 | |||||||||||||||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||||||||||||
| タイトル | Hydrothermal and Magmatic System of a Volcanic Island Inferred From Magnetotellurics, Seismicity, Self-potential, and Thermal Image: An Example of Miyakejima (Japan) | |||||||||||||||||||||||||||||||||||
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| 言語 | eng | |||||||||||||||||||||||||||||||||||
| 著者 |
Marceau Gresse
× Marceau Gresse
× Makoto Uyeshima
× Takao Koyama
× Hideaki Hase
× Koki Aizawa
× Yusuke Yamaya
× Yuichi Morita
× Derek Weller
× Tawat Rung-Arunwan
× Takayuki Kaneko
× Yoichi Sasai
× Jacques Zlotnicki
× Tsuneo Ishido
× Hideki Ueda
× Maki Hata
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| 内容記述タイプ | Other | |||||||||||||||||||||||||||||||||||
| 内容記述 | Phreatic and phreatomagmatic eruptions represent some of the greatest hazards occurring on volcanoes. They result from complex interactions at a depth between rock, water, and magmatic fluids. Understanding and assessing such processes remain a challenging task, notably because a large-scale characterization of volcanic edifices is often lacking. Here we focused on Miyakejima Island, an inhabited 8-km-wide stratovolcano with regular phreatomagmatic activity. We imaged its plumbing system through a combination of four geophysical techniques: magnetotellurics, seismicity, self-potential, and thermal image. We thus propose the first comprehensive interpretation of the volcanic island in terms of rock properties, temperature, fluid content, and fluid flow. We identify a shallow aquifer lying above a clay cap (<1 km depth) and reveal its relation with magmatic-tectonic features and past eruptive activity. At greater depths (2-4.5 km), we infer a seismogenic resistive region interpreted as a magmatic gas-rich reservoir (>= 370 degrees C). From this reservoir, gases rise through a fractured conduit before being released in the fumarolic area at similar to 180 degrees C. During their ascent, these hot fluids cross a similar to 1.2-km-long liquid-dominated zone causing local steam explosions. Such magmatic-hydrothermal interaction elucidates (i) the origin of the long-period seismic events and (ii) the mixing mechanism between magmatic and hydrothermal fluids, which was previously observed in the geochemical signature of fumaroles. Our results demonstrate that combining multidisciplinary large-scale methods is a relevant approach to better understand volcanic systems, with implications for monitoring strategies. | |||||||||||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||||||||||||
| 書誌情報 |
en : JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 巻 126, 号 6, 発行日 2021-06 |
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| 言語 | en | |||||||||||||||||||||||||||||||||||
| 出版者 | AMER GEOPHYSICAL UNION | |||||||||||||||||||||||||||||||||||
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| 収録物識別子タイプ | EISSN | |||||||||||||||||||||||||||||||||||
| 収録物識別子 | 2169-9356 | |||||||||||||||||||||||||||||||||||
| DOI | ||||||||||||||||||||||||||||||||||||
| 関連識別子 | 10.1029/2021JB022034 | |||||||||||||||||||||||||||||||||||
