DOI: 10.1038/s41561-020-0542-0
论文题名: Mechanical and hydrological effects of seamount subduction on megathrust stress and slip
作者: Sun T. ; Saffer D. ; Ellis S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 3 起始页码: 249
结束页码: 255
语种: 英语
英文关键词: drainage
; faulting
; hydrological regime
; mechanical property
; pore space
; seamount
; slip rate
; subduction
; thrust fault
英文摘要: Subduction of rough seafloor and seamounts is thought to impact a broad range of geodynamic processes, including megathrust slip behaviour, forearc fluid flow and long-term structural evolution in the overriding plate. Although there are many conceptual models describing the effects of seamount subduction, our quantitative and mechanistic understanding of the underlying deformation and fluid processes remains incomplete. Here we investigate the interplay between sediment consolidation, faulting and the evolution of stress and pore fluid pressure in response to seamount subduction, using a numerical model that couples mechanical and hydrological processes and is constrained by laboratory and field observations. Our results show that subducting topography drives marked spatial variations in tectonic loading, sediment consolidation and megathrust stress state. Downdip of a subducting seamount on its leading flank, enhanced compression and drainage lead to large fault-normal stress and overconsolidated wall rocks. A stress shadow in the seamount’s wake leads to anomalously high sediment porosity. These variations help explain observed patterns of megathrust slip, with earthquakes and microseismicity favoured at the downdip edge of seamounts and aseismic or slow slip in the updip stress shadow. © 2020, Crown. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169687
Appears in Collections: 气候变化与战略
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作者单位: Department of Geosciences, Pennsylvania State University, University Park, PA, United States; GNS Science, Lower Hutt, New Zealand; Pacific Geoscience Centre, Geological Survey of Canada, Natural Resources Canada, Sidney, BC, Canada; University of Texas Institute for Geophysics, Austin, TX, United States
Recommended Citation:
Sun T.,Saffer D.,Ellis S.. Mechanical and hydrological effects of seamount subduction on megathrust stress and slip[J]. Nature Geoscience,2020-01-01,13(3)