气候变化领域集成服务门户(CCPortal): Co-location of the Downdip End of Seismic Coupling and the Continental Shelf Break

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DOI	10.1029/2020JB019589
	Co-location of the Downdip End of Seismic Coupling and the Continental Shelf Break
	Malatesta L.C.; Bruhat L.; Finnegan N.J.; Olive J.-A.L.
发表日期	2021
ISSN	21699313
卷号	126 期号:1
英文摘要	Along subduction margins, the morphology of the near shore domain records the combined action of erosion from ocean waves and permanent tectonic deformation from the convergence of plates. We observe that at subduction margins around the globe, the edge of continental shelves tends to be located above the downdip end of seismic coupling on the megathrust. Coastlines lie farther landward at variable distances. This observation stems from a compilation of well-resolved coseismic and interseismic coupling data sets. The permanent interseismic uplift component of the total tectonic deformation can explain the localization of the shelf break. It contributes a short wave-length gradient in vertical deformation on top of the structural and isostatic deformation of the margin. This places a hinge line between seaward subsidence and landward uplift above the downdip end of high coupling. Landward of the hinge line, rocks are uplifted in the domain of wave-base erosion and a shelf is maintained by the competition of rock uplift and wave erosion. Wave erosion then sets the coastline back from the tectonically meaningful shelf break. We combine a wave erosion model with an elastic deformation model to illustrate how the downdip end of high coupling pins the location of the shelf break. In areas where the shelf is wide, onshore geodetic constraints on seismic coupling are limited and could be advantageously complemented by considering the location of the shelf break. Subduction margin morphology integrates hundreds of seismic cycles and could inform the persistence of seismic coupling patterns through time. © 2020. The Authors.
英文关键词	earthquake; erosion; morphology; subduction; uplift
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187407
作者单位	Department of Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA, United States; Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, Switzerland; Earth Surface Process Modelling, GFZ German Research Center for Geosciences, Potsdam, Germany; Laboratoire de Géologie, UMR 8538, CNRS, École Normale Supérieure, PSL University, Paris, France
推荐引用方式 GB/T 7714	Malatesta L.C.,Bruhat L.,Finnegan N.J.,et al. Co-location of the Downdip End of Seismic Coupling and the Continental Shelf Break[J],2021,126(1).
APA	Malatesta L.C.,Bruhat L.,Finnegan N.J.,&Olive J.-A.L..(2021).Co-location of the Downdip End of Seismic Coupling and the Continental Shelf Break.Journal of Geophysical Research: Solid Earth,126(1).
MLA	Malatesta L.C.,et al."Co-location of the Downdip End of Seismic Coupling and the Continental Shelf Break".Journal of Geophysical Research: Solid Earth 126.1(2021).