气候变化领域集成服务门户(CCPortal): 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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DOI	10.1029/2021JB022034
	Hydrothermal and Magmatic System of a Volcanic Island Inferred From Magnetotellurics, Seismicity, Self-potential, and Thermal Image: An Example of Miyakejima (Japan)
	Gresse M.; Uyeshima M.; Koyama T.; Hase H.; Aizawa K.; Yamaya Y.; Morita Y.; Weller D.; Rung-Arunwan T.; Kaneko T.; Sasai Y.; Zlotnicki J.; Ishido T.; Ueda H.; Hata M.
发表日期	2021
ISSN	21699313
卷号	126 期号:6
英文摘要	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°C). From this reservoir, gases rise through a fractured conduit before being released in the fumarolic area at ∼180°C. During their ascent, these hot fluids cross a ∼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. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	electrical resistivity; hydrothermal system; magnetotellurics; Miyakejima volcano; seismicity; self-potential
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187070
作者单位	Earthquake Research Institute, The University of Tokyo, Tokyo, Japan; Geothermal Energy Research & Development Co., Ltd., Tokyo, Japan; Institute of Seismology and Volcanology, Faculty of Science, Kyushu University, Fukuoka, Japan; Renewable Energy Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Koriyama, Japan; Curl-E Geophysics Co., Ltd., Bangkok, Thailand; Earthquake Prediction Research Center, Tokai University, Shizuoka, Japan; CNRS, OPGC-UMR6524, Aubière, France; Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan; National Research Institute for Earth Science and Disaster Resilience (NIED), Tsukuba, Japan
推荐引用方式 GB/T 7714	Gresse M.,Uyeshima M.,Koyama T.,et al. Hydrothermal and Magmatic System of a Volcanic Island Inferred From Magnetotellurics, Seismicity, Self-potential, and Thermal Image: An Example of Miyakejima (Japan)[J],2021,126(6).
APA	Gresse M..,Uyeshima M..,Koyama T..,Hase H..,Aizawa K..,...&Hata M..(2021).Hydrothermal and Magmatic System of a Volcanic Island Inferred From Magnetotellurics, Seismicity, Self-potential, and Thermal Image: An Example of Miyakejima (Japan).Journal of Geophysical Research: Solid Earth,126(6).
MLA	Gresse M.,et al."Hydrothermal and Magmatic System of a Volcanic Island Inferred From Magnetotellurics, Seismicity, Self-potential, and Thermal Image: An Example of Miyakejima (Japan)".Journal of Geophysical Research: Solid Earth 126.6(2021).