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Rheological separation of the megathrust seismogenic zone and episodic tremor and slip
Gao, Xiang1,2; Wang, Kelin3,4
2017-03-16
发表期刊NATURE
卷号543期号:7645页码:416-+
文章类型Article
摘要Episodic tremor and accompanying slow slip, together called ETS, is most often observed in subduction zones of young and warm subducting slabs(1-3). ETS should help us to understand the mechanics of subduction megathrusts(3,4), but its mechanism is still unclear. It is commonly assumed that ETS represents a transition from seismic to aseismic behaviour of the megathrust with increasing depth, but this assumption is in contradiction with an observed spatial separation between the seismogenic zone and the ETS zone(5-8). Here we propose a unifying model for the necessary geological condition of ETS that explains the relationship between the two zones. By developing numerical thermal models, we examine the governing role of thermopetrologically controlled fault zone rheology (frictional versus viscous shear). High temperatures in the warm-slab environment(9) cause the megathrust seismogenic zone to terminate before reaching the depth of the intersection of the continental Mohorovicic discontinuity (Moho) and the subduction interface, called the mantle wedge corner. High pore-fluid pressures around the mantle wedge corner(10) give rise to an isolated friction zone responsible for ETS. Separating the two zones is a segment of semi-frictional or viscous behaviour. The new model reconciles a wide range of seemingly disparate observations and defines a conceptual framework for the study of slip behaviour and the seismogenesis of major faults.
DOI10.1038/nature21389
收录类别SCI
语种英语
WOS记录号WOS:000396337400049
引用统计
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/136767
专题海洋地质与环境重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, 7 Nanhai Rd, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, 1 Wenhai Rd, Qingdao 266061, Peoples R China
3.Nat Resources Canada, Geol Survey Canada, Pacific Geosci Ctr, 9860 West Saanich Rd, Sidney, BC V8L 4B2, Canada
4.Univ Victoria, Sch Earth & Ocean Sci, Victoria, BC V8P 5C2, Canada
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Gao, Xiang,Wang, Kelin. Rheological separation of the megathrust seismogenic zone and episodic tremor and slip[J]. NATURE,2017,543(7645):416-+.
APA Gao, Xiang,&Wang, Kelin.(2017).Rheological separation of the megathrust seismogenic zone and episodic tremor and slip.NATURE,543(7645),416-+.
MLA Gao, Xiang,et al."Rheological separation of the megathrust seismogenic zone and episodic tremor and slip".NATURE 543.7645(2017):416-+.
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