DOI: 10.1038/ngeo2701
论文题名: Potential slab deformation and plunge prior to the Tohoku, Iquique and Maule earthquakes
作者: Bouchon M. ; Marsan D. ; Durand V. ; Campillo M. ; Perfettini H. ; Madariaga R. ; Gardonio B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 5 起始页码: 380
结束页码: 383
语种: 英语
Scopus关键词: deformation mechanism
; earthquake
; earthquake rupture
; foreshock
; nucleation
; plate tectonics
; seismic zone
; seismicity
; slab
; subduction zone
; thrust
; Chile
; Honshu
; Iquique
; Japan
; Maule
; Tarapaca
; Tohoku
英文摘要: Megathrust earthquakes rupture hundreds of kilometres of the shallow plate interface in subduction zones, typically at depths of less than 50 km. Intense foreshock activity preceded the 2011 M w 9 Tohoku-oki (Japan) and 2014 M w 8.2 Iquique (Chile) megathrust earthquakes. This pre-earthquake activity was thought to be generated by slow slip in the seismogenic zone before rupture, but where this slow slip originated and how it spread rapidly over long distances are unknown. Here we analyse seismic activity deep in the subduction zone before the Tohoku-oki and Iquique ruptures, as well as before the 2010 M w 8.8 Maule earthquake in Chile. We find that, before each of these megathrust earthquakes, shallow seismicity occurred synchronously with bursts of seismic activity deep (∼100 km) in the subducting slab. The extensional mechanism of these deep shocks suggests that the slab was stretched at depth. We therefore propose that, before these megathrust quakes, the slab might have started to plunge into the mantle below part of the future rupture zone. We speculate that synchronization between deep and shallow seismicity may have marked the nucleation phase for these three giant earthquakes. © 2016 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106022
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: Université de Grenoble Alpes, Centre National de la Recherche Scientifique, ISTerre, BP 53, Grenoble, France; Université de Savoie, ISTerre, Le Bourget du Lac, France; Institut de Physique du Globe de Paris, 1 rue Jussieu, Paris, France; Ecole Normale Supérieure, 24 rue Lhomond, Paris, France
Recommended Citation:
Bouchon M.,Marsan D.,Durand V.,et al. Potential slab deformation and plunge prior to the Tohoku, Iquique and Maule earthquakes[J]. Nature Geoscience,2016-01-01,9(5)