DOI: 10.1016/j.epsl.2018.03.048
Scopus记录号: 2-s2.0-85045209362
论文题名: Influence of increasing convergence obliquity and shallow slab geometry onto tectonic deformation and seismogenic behavior along the Northern Lesser Antilles zone
作者: Laurencin M. ; Graindorge D. ; Klingelhoefer F. ; Marcaillou B. ; Evain M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 492 起始页码: 59
结束页码: 72
语种: 英语
英文关键词: crust nature
; interplate coupling
; interplate geometry
; Northern Lesser Antilles subduction
; partitioning
; seismic data
Scopus关键词: Couplings
; Deformation
; Geodynamics
; Geometry
; Plates (structural components)
; Seismic response
; Seismic waves
; Tectonics
; crust nature
; Interplate coupling
; Lesser Antilles
; partitioning
; Seismic datas
; Earthquakes
; crustal structure
; deformation
; focal mechanism
; geodynamics
; magmatism
; plate boundary
; seismic data
; strike-slip fault
; subduction zone
; tectonic structure
; Anegada Passage
; Leeward Islands [Lesser Antilles]
; Lesser Antilles
英文摘要: In subduction zones, the 3D geometry of the plate interface is one of the key parameters that controls margin tectonic deformation, interplate coupling and seismogenic behavior. The North American plate subducts beneath the convex Northern Lesser Antilles margin. This convergent plate boundary, with a northward increasing convergence obliquity, turns into a sinistral strike-slip limit at the northwestern end of the system. This geodynamic context suggests a complex slab geometry, which has never been imaged before. Moreover, the seismic activity and particularly the number of events with thrust focal mechanism compatible with subduction earthquakes, increases northward from the Barbuda–Anguilla segment to the Anguilla–Virgin Islands segment. One of the major questions in this area is thus to analyze the influence of the increasing convergence obliquity and the slab geometry onto tectonic deformation and seismogenic behavior of the subduction zone. Based on wide-angle and multichannel reflection seismic data acquired during the Antithesis cruises (2013–2016), we decipher the deep structure of this subduction zone. Velocity models derived from wide-angle data acquired across the Anegada Passage are consistent with the presence of a crust of oceanic affinity thickened by hotspot magmatism and probably affected by the Upper Cretaceous–Eocene arc magmatism forming the ‘Great Arc of the Caribbean’. The slab is shallower beneath the Anguilla–Virgin Islands margin segment than beneath the Anguilla–Barbuda segment which is likely to be directly related to the convex geometry of the upper plate. This shallower slab is located under the forearc where earthquakes and partitioning deformations increase locally. Thus, the shallowing slab might result in local greater interplate coupling and basal friction favoring seismic activity and tectonic partitioning beneath the Virgin Islands platform. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109897
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Geosciences Océan, UMR 6538, Université Bretagne Occidentale, Institut Universitaire Européen de la Mer, Place N. Copernic, Plouzané, 29280, France; Ifremer, Brest, France; Université Côte d'Azur, CNRS, Observatoire de la Côte d'Azur, IRD, Géoazur, 250 Rue Albert Einstein, Valbonne, 06560, France
Recommended Citation:
Laurencin M.,Graindorge D.,Klingelhoefer F.,et al. Influence of increasing convergence obliquity and shallow slab geometry onto tectonic deformation and seismogenic behavior along the Northern Lesser Antilles zone[J]. Earth and Planetary Science Letters,2018-01-01,492