DOI: 10.1038/ngeo2585
论文题名: Seismic slip on an upper-plate normal fault during a large subduction megathrust rupture
作者: Hicks S.P. ; Rietbrock A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 12 起始页码: 955
结束页码: 960
语种: 英语
Scopus关键词: earthquake
; fault plane
; fault slip
; seismic data
; subduction
; subduction zone
; tsunami event
; Chile
英文摘要: Quantification of stress accumulation and release during subduction zone seismic cycles requires an understanding of the distribution of fault slip during earthquakes. Reconstructions of slip are typically constrained to a single, known fault plane. Yet, slip has been shown to occur on multiple faults within the subducting plate owing to stress triggering, resulting in phenomena such as earthquake doublets. However, rapid stress triggering from the plate interface to faults in the overriding plate has not been documented. Here we analyse seismic data from the magnitude 7.1 Araucania earthquake that occurred in the Chilean subduction zone in 2011. We find that the earthquake, which was reported as a single event in global moment tensor solutions, was instead composed of two ruptures on two separate faults. Within 12 s a thrust earthquake on the plate interface triggered a second large rupture on a normal fault 30 km away in the overriding plate. This configuration of partitioned rupture is consistent with normal-faulting mechanisms in the ensuing aftershock sequence. We conclude that plate interface rupture can trigger almost instantaneous slip in the overriding plate of a subduction zone. This shallow upper-plate rupture may be masked from teleseismic data, posing a challenge for real-time tsunami warning systems. © 2015 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106118
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: University of Liverpool, Jane Herdman Laboratories, 4 Brownlow Street, Liverpool, United Kingdom
Recommended Citation:
Hicks S.P.,Rietbrock A.. Seismic slip on an upper-plate normal fault during a large subduction megathrust rupture[J]. Nature Geoscience,2015-01-01,8(12)