DOI: 10.1038/ngeo2857
论文题名: Subduction megathrust creep governed by pressure solution and frictional-viscous flow
作者: Fagereng Å. ; Den Hartog S.A.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 1 起始页码: 51
结束页码: 57
语种: 英语
Scopus关键词: boundary condition
; creep
; deformation
; laboratory method
; plate convergence
; quantitative analysis
; sliding
; slip rate
; subduction
; thrust fault
; viscous flow
英文摘要: Subduction megathrust slip speeds range from slow creep at plate convergence rates (centimetres per year) to seismic slip rates (metres per second) in the largest earthquakes on Earth. The deformation mechanisms controlling whether fast slip or slow creep occurs, however, remain unclear. Here, we present evidence that pressure solution creep (fluid-assisted stress driven mass transfer) is an important deformation mechanism in megathrust faults. We quantify megathrust strength using a laboratory-constrained microphysical model for fault friction, involving viscous pressure solution and frictional sliding. We find that at plate-boundary deformation rates, aseismic, frictional-viscous flow is the preferred deformation mechanism at temperatures above 100 °C. The model thus predicts aseismic creep at temperatures much cooler than the onset of crystal plasticity, unless a boundary condition changes. Within this model framework, earthquakes may nucleate when a local increase in strain rate triggers velocity-weakening slip, and we speculate that slip area and event magnitude increase with increasing spacing of strong, topographically derived irregularities in the subduction interface. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105868
Appears in Collections: 气候减缓与适应 科学计划与规划
There are no files associated with this item.
作者单位: School of Earth and Ocean Sciences, Cardiff University, Cardiff, United Kingdom; Department of Geological Sciences, University of Cape Town, Private Bag X3, Rondebosch, South Africa; HPT Laboratory, Department of Earth Sciences, Utrecht University, Utrecht, Netherlands; Rock Deformation Laboratory, School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom
Recommended Citation:
Fagereng Å.,Den Hartog S.A.M.. Subduction megathrust creep governed by pressure solution and frictional-viscous flow[J]. Nature Geoscience,2017-01-01,10(1)