globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2021.228888
论文题名:
Shallow fault systems of thrust anticlines responding to changes in accretionary prism lithology (Nankai, SE Japan)
作者: Maunde A.; Alves T.M.; Moore G.F.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 812
语种: 英语
中文关键词: Fault growth ; Mechanical stratigraphy ; Nankai Trough ; Segment linkage ; Subduction zones ; Tectonic shortening
英文关键词: Lithology ; Prisms ; Seismology ; Stratigraphy ; Accretionary prism ; Late quaternary ; Local stress distribution ; Plate subduction ; Shallow faults ; Tectonic shortening ; Tectonic stress ; Threedimensional (3-d) ; Faulting ; accretionary prism ; anticline ; fault ; lithology ; seafloor ; stratigraphy ; subduction zone ; tectonic structure ; thrust ; China ; Nankai ; Tianjin
英文摘要: Three-dimensional (3D) pre-stack depth migrated seismic data are used to analyse the geometry and growth of shallow faults associated with tectonic shortening in four (4) prominent thrust anticlines off Nankai, SE Japan. The four thrust anticlines show a trenchward increase in horizontal shortening and deform the seafloor at present. They shortened the overburden strata by 7143 m in the Late Quaternary, reflecting a horizontal shortening of 32.9% in response to plate subduction. A significant number of closely spaced and segmented fault arrays is observed in their hinge regions. Vertically segmented fault arrays with local throw maxima between 5 and 14 m relate to the existence of more competent (strong) intervals, or layers. Incompetent (weak) intervals record relatively small throw values between 2 and 5 m. We show that the presence of closely spaced, segmented fault arrays at shallow stratigraphic levels can have a significant impact on local stress distribution, controlling near-seafloor strain in accretionary prisms as Nankai's. The observed mechanical layering is likely to continue at depth to control the accumulation of tectonic stress in faults posed to reactivate during seismic events. © 2021 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170859
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作者单位: 3D Seismic Laboratory, School of Earth and Environmental Sciences, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, United Kingdom; Department of Geology, School of Physical Sciences, Modibbo Adama University of Technology, P.M.B, Yola, 2076, Nigeria; Department of Earth Sciences, University of Hawaii, 1680 East-West Rd, Honolulu, HI 96822, United States

Recommended Citation:
Maunde A.,Alves T.M.,Moore G.F.. Shallow fault systems of thrust anticlines responding to changes in accretionary prism lithology (Nankai, SE Japan)[J]. Tectonophysics,2021-01-01,812
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