DOI: 10.1038/ngeo2864
论文题名: Supercycle at the Ecuadorian subduction zone revealed after the 2016 Pedernales earthquake
作者: Nocquet J.-M. ; Jarrin P. ; Vallée M. ; Mothes P.A. ; Grandin R. ; Rolandone F. ; Delouis B. ; Yepes H. ; Font Y. ; Fuentes D. ; Régnier M. ; Laurendeau A. ; Cisneros D. ; Hernandez S. ; Sladen A. ; Singaucho J.-C. ; Mora H. ; Gomez J. ; Montes L. ; Charvis P.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 2 起始页码: 145
结束页码: 149
语种: 英语
Scopus关键词: earthquake magnitude
; earthquake mechanism
; earthquake rupture
; paleoseismicity
; plate tectonics
; seismic hazard
; seismic moment
; seismic quiescence
; seismology
; subduction zone
; twentieth century
; Colombia
; Dominican Republic
; Ecuador
; Hispaniola
; Pedernales
英文摘要: Large earthquakes are usually assumed to release all of the strain accumulated since the previous event, implying a reduced seismic hazard after them. However, long records of seismic history at several subduction zones suggest supercycle behaviour, where centuries-long accumulated strain is released through clustered large earthquakes, resulting in an extended period of enhanced seismic hazard. Here we combine historical seismology results, present-day geodesy data, and dense local observations of the recent M w 7.8 2016 Pedernales earthquake to reconstruct the strain budget at the Ecuador subduction zone since the great 1906 earthquake. We show that the Pedernales earthquake involved the successive rupture of two patches on the plate interface that were locked prior to the earthquake and most probably overlaps the area already ruptured in 1942 by a similar earthquake. However, we find that coseismic slip in 2016 exceeds the deficit accumulated since 1942. The seismic moment of every large earthquake during the twentieth century further exceeds the moment deficit accumulated since 1906. These results, together with the seismic quiescence before 1906 highlighted by historical records and marine palaeoseismology, argue for an earthquake supercycle at the Ecuador-Colombia margin. This behaviour, which has led to an enhanced seismic hazard for 110 years, is possibly still going on and may apply to other subduction zones that recently experienced a great earthquake. © 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/105851
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 Côte d'Azur, IRD, CNRS, Observatoire de la Côte d'Azur, Geoazur, Valbonne, France; Instituto Geofísico, Escuela Politécnica Nacional, Quito, Ecuador; Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, Paris, France; Sorbonne Universités, UPMC Université Paris 06, CNRS, Institut des Sciences de la Terre de Paris (ISTeP), Paris, France; Instituto Geográfico Militar, Quito, Ecuador; Servicio Geológico Colombiano, GNSS GeoRED Project, Center for Processing and Analysis of Geodetic Data, Bogota, Colombia
Recommended Citation:
Nocquet J.-M.,Jarrin P.,Vallée M.,et al. Supercycle at the Ecuadorian subduction zone revealed after the 2016 Pedernales earthquake[J]. Nature Geoscience,2017-01-01,10(2)