globalchange  > 气候减缓与适应
DOI: 10.1038/s41561-018-0089-5
论文题名:
Chilean megathrust earthquake recurrence linked to frictional contrast at depth
作者: Moreno M.; Li S.; Melnick D.; Bedford J.R.; Baez J.C.; Motagh M.; Metzger S.; Vajedian S.; Sippl C.; Gutknecht B.D.; Contreras-Reyes E.; Deng Z.; Tassara A.; Oncken O.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2018
卷: 11, 期:4
起始页码: 285
结束页码: 290
语种: 英语
英文摘要: Fundamental processes of the seismic cycle in subduction zones, including those controlling the recurrence and size of great earthquakes, are still poorly understood. Here, by studying the 2016 earthquake in southern Chile - the first large event within the rupture zone of the 1960 earthquake (moment magnitude (M w) = 9.5) - we show that the frictional zonation of the plate interface fault at depth mechanically controls the timing of more frequent, moderate-size deep events (M w < 8) and less frequent, tsunamigenic great shallow earthquakes (M w > 8.5). We model the evolution of stress build-up for a seismogenic zone with heterogeneous friction to examine the link between the 2016 and 1960 earthquakes. Our results suggest that the deeper segments of the seismogenic megathrust are weaker and interseismically loaded by a more strongly coupled, shallower asperity. Deeper segments fail earlier (~60 yr recurrence), producing moderate-size events that precede the failure of the shallower region, which fails in a great earthquake (recurrence >110 yr). We interpret the contrasting frictional strength and lag time between deeper and shallower earthquakes to be controlled by variations in pore fluid pressure. Our integrated analysis strengthens understanding of the mechanics and timing of great megathrust earthquakes, and therefore could aid in the seismic hazard assessment of other subduction zones. © 2018 The Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105576
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: GFZ Helmholtz Centre Potsdam, German Research Centre for Geosciences, Telegrafenberg, Potsdam, Germany; Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Concepción, Chile; Department of Earth and Environmental Sciences, University of Iowa, Iowa City, IA, United States; Instituto de Ciencias de la Tierra, TAQUACH, Universidad Austral de Chile, Valdivia, Chile; Millennium Nucleus the Seismic Cycle Along Subduction Zones, Valdivia, Concepción, Chile; Centro Sismológico National, Universidad de Chile, Facultad de Ciencias Físicas y Matemáticas, Santiago, Chile; Institute of Photogrammetry and GeoInformation, Leibniz Universität Hannover, Hannover, Germany; Institut für Planetare Geodäsie, Technische Universität Dresden, Dresden, Germany; Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile; Departamento de Ciencias de la Tierra, Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile

Recommended Citation:
Moreno M.,Li S.,Melnick D.,et al. Chilean megathrust earthquake recurrence linked to frictional contrast at depth[J]. Nature Geoscience,2018-01-01,11(4)
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