DOI: 10.1016/j.epsl.2018.09.025
Scopus记录号: 2-s2.0-85054505841
论文题名: Kinematic study of Iquique 2014 Mw 8.1 earthquake: Understanding the segmentation of the seismogenic zone
作者: Jara J. ; Sánchez-Reyes H. ; Socquet A. ; Cotton F. ; Virieux J. ; Maksymowicz A. ; Díaz-Mojica J. ; Walpersdorf A. ; Ruiz J. ; Cotte N. ; Norabuena E.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 503 起始页码: 131
结束页码: 143
语种: 英语
英文关键词: high-rate GPS
; kinematic inversion
; megathrust earthquakes
; strong Motion
; subduction segmentation
Scopus关键词: Earthquake effects
; Frequency domain analysis
; Kinematics
; Tectonics
; Geological features
; Geophysical information
; High rate
; High resolution bathymetry
; Kinematic inversion
; Megathrust earthquakes
; Static displacement
; Strong motion
; Global positioning system
英文摘要: We study the rupture processes of Iquique earthquake Mw 8.1 (2014/04/01) and its largest aftershock Mw 7.7 (2014/04/03) that ruptured the North Chile subduction zone. High-rate Global Positioning System (GPS) recordings and strong motion data are used to reconstruct the evolution of the slip amplitude, rise time and rupture time of both earthquakes. A two-step inversion scheme is assumed, by first building prior models for both earthquakes from the inversion of the estimated static displacements and then, kinematic inversions in the frequency domain are carried out taken into account this prior information. The preferred model for the mainshock exhibits a seismic moment of 1.73 × 1021 Nm (Mw 8.1) and maximum slip of ∼9 m, while the aftershock model has a seismic moment of 3.88 × 1020 (Mw 7.7) and a maximum slip of ∼3 m. For both earthquakes, the final slip distributions show two asperities (a shallow one and a deep one) separated by an area with significant slip deficit. This suggests a segmentation along-dip which might be related to a change of the dipping angle of the subducting slab inferred from gravimetric data. Along-strike, the areas where the seismic ruptures stopped seem to be well correlated with geological features observed from geophysical information (high-resolution bathymetry, gravimetry and coupling maps) that are representative of the long-term segmentation of the subduction margin. Considering the spatially limited portions that were broken by these two earthquakes, our results support the idea that the seismic gap is not filled yet. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109627
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, F-38000, France; German Research Centre for Geosciences, GFZ Helmholtz Centre Potsdam, Potsdam, Germany; Institute for Earth and Environmental Sciences, University of Potsdam, Potsdam, Germany; Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile; Instituto de Geofísica, Universidad Nacional Autónoma de México, México, Mexico; Instituto Geofísico del Perú, Lima, Peru; Laboratoire de Géologie, Département de Géosciences, ENS, CNRS, UMR8538, PSL Research University, Paris, France
Recommended Citation:
Jara J.,Sánchez-Reyes H.,Socquet A.,et al. Kinematic study of Iquique 2014 Mw 8.1 earthquake: Understanding the segmentation of the seismogenic zone[J]. Earth and Planetary Science Letters,2018-01-01,503