气候变化领域集成服务门户(CCPortal): Drainage of a deep magma reservoir near Mayotte inferred from seismicity and deformation

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DOI	10.1038/s41561-019-0505-5
	Drainage of a deep magma reservoir near Mayotte inferred from seismicity and deformation
	Cesca S.; Letort J.; Razafindrakoto H.N.T.; Heimann S.; Rivalta E.; Isken M.P.; Nikkhoo M.; Passarelli L.; Petersen G.M.; Cotton F.; Dahm T.
发表日期	2020
ISSN	17520894
卷号	13 期号:1
英文摘要	The dynamics of magma deep in the Earth’s crust are difficult to capture by geophysical monitoring. Since May 2018, a seismically quiet area offshore of Mayotte in the western Indian Ocean has been affected by complex seismic activity, including long-duration, very-long-period signals detected globally. Global Navigation Satellite System stations on Mayotte have also recorded a large surface deflation offshore. Here we analyse regional and global seismic and deformation data to provide a one-year-long detailed picture of a deep, rare magmatic process. We identify about 7,000 volcano-tectonic earthquakes and 407 very-long-period seismic signals. Early earthquakes migrated upward in response to a magmatic dyke propagating from Moho depth to the surface, whereas later events marked the progressive failure of the roof of a magma reservoir, triggering its resonance. An analysis of the very-long-period seismicity and deformation suggests that at least 1.3 km3 of magma drained from a reservoir of 10 to 15 km diameter at 25 to 35 km depth. We demonstrate that such deep offshore magmatic activity can be captured without any on-site monitoring. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	deflation; deformation; deformation mechanism; dike; earthquake event; GNSS; magma chamber; Moho; roof; seismicity; Indian Ocean; Mayotte
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124523
作者单位	GFZ German Research Centre for Geosciences, Potsdam, Germany; Observatoire Midi Pyrénées, IRAP, CNRS UMR 5277, Université Paul Sabatier, Toulouse, France; University of Kiel, Kiel, Germany; King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia; University of Potsdam, Potsdam, Germany
推荐引用方式 GB/T 7714	Cesca S.,Letort J.,Razafindrakoto H.N.T.,et al. Drainage of a deep magma reservoir near Mayotte inferred from seismicity and deformation[J],2020,13(1).
APA	Cesca S..,Letort J..,Razafindrakoto H.N.T..,Heimann S..,Rivalta E..,...&Dahm T..(2020).Drainage of a deep magma reservoir near Mayotte inferred from seismicity and deformation.Nature Geoscience,13(1).
MLA	Cesca S.,et al."Drainage of a deep magma reservoir near Mayotte inferred from seismicity and deformation".Nature Geoscience 13.1(2020).