气候变化领域集成服务门户(CCPortal): Stress transition from horizontal to vertical forces during subduction initiation

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DOI	10.1038/s41561-021-00880-4
	Stress transition from horizontal to vertical forces during subduction initiation
	Shuck, Brandon; Gulick, Sean P. S.; Van Avendonk, Harm J. A.; Gurnis, Michael; Sutherland, Rupert; Stock, Joann; Hightower, Erin
发表日期	2022
ISSN	1752-0894
EISSN	1752-0908
起始页码	149
结束页码	+
卷号	15 期号:2 页码:19
英文摘要	Subduction zones are fundamental to plate tectonics, yet how they initiate remains enigmatic. Geodynamic models suggest that if horizontal forces dominate, the upper plate experiences compression and uplift followed by extension and subsidence, whereas vertically forced subduction involves only extension. Geologic evidence of past subduction initiation events has been interpreted in terms of these alternatives; however, it is unclear whether they are mutually exclusive or represent different stages of early subduction. Here, we present seismic images of the Puysegur plate boundary south of New Zealand that reveal space-time relations of stress during subduction initiation. Our data show evidence for a stress transition (compression followed by extension) that spread from north to south as the trench nucleated and propagated along the plate boundary. Both the magnitude and duration of compression diminish from north (8 Myr) to south (5 Myr). This indicates that transition to self-sustaining subduction accelerates after nucleation of a downgoing slab increases driving forces and decreases fault strength near the propagating tipline of the nascent trench. Instead of horizontally forced versus vertically forced initiation, we propose a four-dimensional evolution, where horizontal forces initially dominate at the site of nucleation, but with time, vertical forces accelerate, propagate along strike and facilitate the development of self-sustaining subduction. Stress transitions from horizontally forced compression to vertically forced extension during subduction initiation, according to seismic images of the Puysegur plate boundary, New Zealand.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000753959100012
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/272490
作者单位	University of Texas System; University of Texas Austin; University of Texas System; University of Texas Austin; Columbia University; California Institute of Technology; Victoria University Wellington
推荐引用方式 GB/T 7714	Shuck, Brandon,Gulick, Sean P. S.,Van Avendonk, Harm J. A.,et al. Stress transition from horizontal to vertical forces during subduction initiation[J],2022,15(2):19.
APA	Shuck, Brandon.,Gulick, Sean P. S..,Van Avendonk, Harm J. A..,Gurnis, Michael.,Sutherland, Rupert.,...&Hightower, Erin.(2022).Stress transition from horizontal to vertical forces during subduction initiation.NATURE GEOSCIENCE,15(2),19.
MLA	Shuck, Brandon,et al."Stress transition from horizontal to vertical forces during subduction initiation".NATURE GEOSCIENCE 15.2(2022):19.