globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1802
论文题名:
Andean structural control on interseismic coupling in the North Chile subduction zone
作者: Béjar-Pizarro M.; Socquet A.; Armijo R.; Carrizo D.; Genrich J.; Simons M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:6
起始页码: 462
结束页码: 467
语种: 英语
Scopus关键词: earthquake magnitude ; earthquake rupture ; GPS ; radar interferometry ; satellite data ; segmentation ; subduction zone ; topography ; Andes ; Antofagasta ; Chile ; Mejillones Peninsula
英文摘要: Segmentation can influence the extent of earthquake rupture and event magnitude: large megathrust earthquakes result from total rupture of relatively continuous segments of the subduction interface. Segmentation is attributed to variations in the frictional properties of the seismogenic zone or to topographic features on the down-going plate. Structures in the overriding plate may also influence segmentation, but their importance has been dismissed. Here, we investigate the links between interface segmentation at the North Chile seismic gap and a crustal-scale fault structure in the overriding plate that forms a coastal scarp of about 1 km in height. We use satellite interferometric synthetic aperture radar (InSAR) and Global Positioning System (GPS) data to measure interseismic surface deformation between 2003 and 2009 and compare the deformation with rupture extent during well-documented earthquakes. From these data we infer the degree of coupling and segmentation at depth. We find that along a 500-km-long segment, the base of the strongly coupled seismogenic zone correlates with the line of the surface coastal scarp and follows the outline of the Mejillones Peninsula. This correlation implies that large-scale structures in the overriding plate can influence the frictional properties of the seismogenic zone at depth. We therefore suggest that the occurrence of megathrust earthquakes in northern Chile is controlled by the surface structures that build Andean topography. © 2013 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106766
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: Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Univ. Paris Diderot, UMR 7154 CNRS, F-75005 Paris, France; InSARlab Geohazards InSAR Laboratory, Geoscience Research Deptartment, Geological Survey of Spain, Alenza 1, 28003, Spain; Université Joseph Fourier-Grenoble i, OSUG-Observatoire des Sciences de l'Univers de Grenoble, ISTerre-Institut des Sciences de la Terre Maison des Géosciences, 1381, rue de la Piscine, 38400-Saint Martin d'Heres, France; Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Blanco Encalada 2002, Santiago, Chile; Seismological Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States

Recommended Citation:
Béjar-Pizarro M.,Socquet A.,Armijo R.,et al. Andean structural control on interseismic coupling in the North Chile subduction zone[J]. Nature Geoscience,2013-01-01,6(6)
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