DOI: 10.1016/j.epsl.2017.12.004
Scopus记录号: 2-s2.0-85038215808
论文题名: Forearc collapse, plate flexure, and seismicity within the downgoing plate along the Sunda Arc west of Sumatra
作者: Craig T.J. ; Copley A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 484 起始页码: 81
结束页码: 91
语种: 英语
英文关键词: flexure
; forearc deformation
; intraplate seismicity
; Sumatra
Scopus关键词: Deformation
; Earthquakes
; Morphology
; Prisms
; Structural geology
; Tectonics
; Extensional faulting
; flexure
; Forearc
; Gravitational collapse
; Intraplate earthquakes
; Intraplate seismicity
; Oceanic lithosphere
; Sumatra
; Geophysics
; collapse
; deformation
; earthquake event
; faulting
; oceanic lithosphere
; plate tectonics
; seismicity
; subduction zone
; Indonesia
; Indonesian seas
; Pacific Ocean
; Sunda Arc
; West Sumatra
英文摘要: Deformation within the downgoing oceanic lithosphere seawards of subduction zones is typically characterised by regimes of shallow extension and deeper compression, due to the bending of the oceanic plate as it dips into the subduction zone. However, offshore Sumatra there are shallow compressional earthquakes within the downgoing oceanic plate outboard of the region of high slip in the 2004 Aceh–Andaman earthquake, occurring at the same depth as extensional faulting further seaward from the trench. A clear separation is seen in the location of intraplate earthquakes, with extensional earthquakes occurring further seawards than compressional earthquakes at the same depth within the plate. The adjacent section of the forearc prism west of Aceh is also anomalous in its morphology, characterised by a wide prism with a steep bathymetric front and broad, gradually-sloping top. This shape is in contrast to the narrower and more smoothly-sloping prism to the south, and along other subduction zones. The anomalous near-trench intraplate earthquakes and prism morphology are likely to be the result of the geologically-rapid gravitational collapse of the forearc, which leads to induced bending within the subducting plate, and the distinctive plateau-like morphology of the forearc. Such collapse of the forearc could be caused by changes through time of the material properties of the forearc rocks, or of the thickness of the sediments entering the subduction zone. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110074
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: Institute of Geophysics and Tectonics, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; Bullard Laboratories, Department of Earth Sciences, University of Cambridge, Madingley Road, Cambridge, CB3 0EZ, United Kingdom
Recommended Citation:
Craig T.J.,Copley A.. Forearc collapse, plate flexure, and seismicity within the downgoing plate along the Sunda Arc west of Sumatra[J]. Earth and Planetary Science Letters,2018-01-01,484