气候变化领域集成服务门户(CCPortal): Geodetic Evidence of Time-Dependent Viscoelastic Interseismic Deformation Driven by Megathrust Locking in the Southwest Japan Subduction Zone

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DOI	10.1029/2019GL085551
	Geodetic Evidence of Time-Dependent Viscoelastic Interseismic Deformation Driven by Megathrust Locking in the Southwest Japan Subduction Zone
	Li S.; Fukuda J.; Oncken O.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:4
英文摘要	The time-variable features of interseismic deformation in subduction zones are poorly understood and commonly ignored. Here, by incorporating century-long leveling data and contemporary global navigation satellite systems (GNSS) velocities, we investigate the temporal evolution of interseismic deformation in southwest Japan using two-dimensional viscoelastic earthquake-cycle models. We find that a steady-state continental mantle viscosity of 1019 Pa·s is required to explain these two geodetic data sets. Our preferred model predicts significant variations in the surface velocity field throughout the entire interseismic period due to viscous mantle flow driven by ongoing megathrust locking, indicating that the multiyear GNSS-derived velocity field represents a snapshot of time-varying interseismic deformation. The locking depth and locking time exert significant influences on the horizontal and vertical deformation patterns. Our findings highlight the importance of the interseismically relaxing mantle and the necessity of considering such an effect in determining the current locking state along the Nankai subduction zone. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Deformation; Earthquakes; Geodesy; Global positioning system; Velocity; Viscoelasticity; Earthquake cycles; interseismic locking; Nankai subduction zone; Time-dependent deformation; Viscoelastic relaxation; Locks (fasteners); crustal deformation; geodetic network; GNSS; mantle; satellite data; seismic discrimination; steady-state equilibrium; subduction zone; thrust; viscoelasticity; China; Nankai; Tianjin
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170677
作者单位	Earthquake Research Institute, The University of Tokyo, Tokyo, Japan; Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam, Germany
推荐引用方式 GB/T 7714	Li S.,Fukuda J.,Oncken O.. Geodetic Evidence of Time-Dependent Viscoelastic Interseismic Deformation Driven by Megathrust Locking in the Southwest Japan Subduction Zone[J],2020,47(4).
APA	Li S.,Fukuda J.,&Oncken O..(2020).Geodetic Evidence of Time-Dependent Viscoelastic Interseismic Deformation Driven by Megathrust Locking in the Southwest Japan Subduction Zone.Geophysical Research Letters,47(4).
MLA	Li S.,et al."Geodetic Evidence of Time-Dependent Viscoelastic Interseismic Deformation Driven by Megathrust Locking in the Southwest Japan Subduction Zone".Geophysical Research Letters 47.4(2020).