DOI: 10.1038/s41561-019-0505-5
论文题名: Drainage of a deep magma reservoir near Mayotte inferred from seismicity and deformation
作者: 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.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 1 起始页码: 87
结束页码: 93
语种: 英语
英文关键词: deflation
; deformation
; deformation mechanism
; dike
; earthquake event
; GNSS
; magma chamber
; Moho
; roof
; seismicity
; Indian Ocean
; Mayotte
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169571
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Cesca S.,Letort J.,Razafindrakoto H.N.T.,et al. Drainage of a deep magma reservoir near Mayotte inferred from seismicity and deformation[J]. Nature Geoscience,2020-01-01,13(1)