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DOI | 10.1038/NGEO2857 |
Subduction megathrust creep governed by pressure solution and frictional-viscous flow | |
Fagereng, Ake1,2; den Hartog, Sabine A. M.3,4 | |
2017 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | Wales; South Africa; Netherlands; England |
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 degrees 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. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394117300014 |
WOS关键词 | MICROPHYSICAL MODEL ; SHIMANTO BELT ; FAULT GOUGES ; SLIP ; ZONE ; STRENGTH ; MELANGE ; THRUST ; QUARTZ ; EARTHQUAKES |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34764 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Cardiff Univ, Sch Earth & Ocean Sci, Cardiff CF10 3AT, S Glam, Wales; 2.Univ Cape Town, Dept Geol Sci, Private Bag X3, ZA-7701 Rondebosch, South Africa; 3.Univ Utrecht, Dept Earth Sci, HPT Lab, Utrecht, Netherlands; 4.Univ Liverpool, Sch Environm Sci, Rock Deformat Lab, Liverpool, Merseyside, England |
推荐引用方式 GB/T 7714 | Fagereng, Ake,den Hartog, Sabine A. M.. Subduction megathrust creep governed by pressure solution and frictional-viscous flow[J]. NATURE GEOSCIENCE,2017,10(1). |
APA | Fagereng, Ake,&den Hartog, Sabine A. M..(2017).Subduction megathrust creep governed by pressure solution and frictional-viscous flow.NATURE GEOSCIENCE,10(1). |
MLA | Fagereng, Ake,et al."Subduction megathrust creep governed by pressure solution and frictional-viscous flow".NATURE GEOSCIENCE 10.1(2017). |
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