气候变化领域集成服务门户(CCPortal): Mechanical and hydrological effects of seamount subduction on megathrust stress and slip

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DOI	10.1038/s41561-020-0542-0
	Mechanical and hydrological effects of seamount subduction on megathrust stress and slip
	Sun T.; Saffer D.; Ellis S.
发表日期	2020
ISSN	17520894
卷号	13 期号:3
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.
语种	英语
scopus关键词	drainage; faulting; hydrological regime; mechanical property; pore space; seamount; slip rate; subduction; thrust fault
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124490
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
推荐引用方式 GB/T 7714	Sun T.,Saffer D.,Ellis S.. Mechanical and hydrological effects of seamount subduction on megathrust stress and slip[J],2020,13(3).
APA	Sun T.,Saffer D.,&Ellis S..(2020).Mechanical and hydrological effects of seamount subduction on megathrust stress and slip.Nature Geoscience,13(3).
MLA	Sun T.,et al."Mechanical and hydrological effects of seamount subduction on megathrust stress and slip".Nature Geoscience 13.3(2020).