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The Seismic Sequence of the 16 September 2015 M w 8.3 Illapel, Chile, Earthquake

2016; Seismological Society of America; Volume: 87; Issue: 4 Linguagem: Inglês

10.1785/0220150281

1938-2057

Sergio Ruiz, Émilie Klein, Francisco del Campo, E. Rivera, Piero Poli, Marianne Métois, C. Vigny, Juan Carlos Báez, Gabriel Vargas, Felipe Leyton, Raúl Madariaga, Luce Fleitout,

Seismic Waves and Analysis

Research Article| May 25, 2016 The Seismic Sequence of the 16 September 2015 Mw 8.3 Illapel, Chile, Earthquake Sergio Ruiz; Sergio Ruiz aDepartamento de Geofísica, Universidad de Chile, Blanco Encalada 2002, Santiago, Chilesruiz@dgf.uchile.cl Search for other works by this author on: GSW Google Scholar Emilie Klein; Emilie Klein bLaboratoire de Géologie, École Normale Supérieure, 24 Rue Lhomond, 75231 Paris, France Search for other works by this author on: GSW Google Scholar Francisco del Campo; Francisco del Campo cCentro Sismologico Nacional, Universidad de Chile, Blanco Encalada 2002, Santiago, Chile Search for other works by this author on: GSW Google Scholar Efrain Rivera; Efrain Rivera dDepartamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Search for other works by this author on: GSW Google Scholar Piero Poli; Piero Poli eMassachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139 U.S.A. Search for other works by this author on: GSW Google Scholar Marianne Metois; Marianne Metois fLaboratoire de Geologie de Lyon, Terre, Planetes, Environnement, Universite de Lyon, CNRS UMR5276, Universite Lyon 1 ‐ ENS Lyon, Villeurbanne, France Search for other works by this author on: GSW Google Scholar Vigny Christophe; Vigny Christophe bLaboratoire de Géologie, École Normale Supérieure, 24 Rue Lhomond, 75231 Paris, France Search for other works by this author on: GSW Google Scholar Juan Carlos Baez; Juan Carlos Baez cCentro Sismologico Nacional, Universidad de Chile, Blanco Encalada 2002, Santiago, Chile Search for other works by this author on: GSW Google Scholar Gabriel Vargas; Gabriel Vargas dDepartamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Search for other works by this author on: GSW Google Scholar Felipe Leyton; Felipe Leyton cCentro Sismologico Nacional, Universidad de Chile, Blanco Encalada 2002, Santiago, Chile Search for other works by this author on: GSW Google Scholar Raúl Madariaga; Raúl Madariaga bLaboratoire de Géologie, École Normale Supérieure, 24 Rue Lhomond, 75231 Paris, France Search for other works by this author on: GSW Google Scholar Luce Fleitout Luce Fleitout bLaboratoire de Géologie, École Normale Supérieure, 24 Rue Lhomond, 75231 Paris, France Search for other works by this author on: GSW Google Scholar Author and Article Information Sergio Ruiz aDepartamento de Geofísica, Universidad de Chile, Blanco Encalada 2002, Santiago, Chilesruiz@dgf.uchile.cl Emilie Klein bLaboratoire de Géologie, École Normale Supérieure, 24 Rue Lhomond, 75231 Paris, France Francisco del Campo cCentro Sismologico Nacional, Universidad de Chile, Blanco Encalada 2002, Santiago, Chile Efrain Rivera dDepartamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Piero Poli eMassachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139 U.S.A. Marianne Metois fLaboratoire de Geologie de Lyon, Terre, Planetes, Environnement, Universite de Lyon, CNRS UMR5276, Universite Lyon 1 ‐ ENS Lyon, Villeurbanne, France Vigny Christophe bLaboratoire de Géologie, École Normale Supérieure, 24 Rue Lhomond, 75231 Paris, France Juan Carlos Baez cCentro Sismologico Nacional, Universidad de Chile, Blanco Encalada 2002, Santiago, Chile Gabriel Vargas dDepartamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Felipe Leyton cCentro Sismologico Nacional, Universidad de Chile, Blanco Encalada 2002, Santiago, Chile Raúl Madariaga bLaboratoire de Géologie, École Normale Supérieure, 24 Rue Lhomond, 75231 Paris, France Luce Fleitout bLaboratoire de Géologie, École Normale Supérieure, 24 Rue Lhomond, 75231 Paris, France Publisher: Seismological Society of America First Online: 14 Jul 2017 Online Issn: 1938-2057 Print Issn: 0895-0695 © 2016 by the Seismological Society of America Seismological Research Letters (2016) 87 (4): 789–799. https://doi.org/10.1785/0220150281 Article history First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Sergio Ruiz, Emilie Klein, Francisco del Campo, Efrain Rivera, Piero Poli, Marianne Metois, Vigny Christophe, Juan Carlos Baez, Gabriel Vargas, Felipe Leyton, Raúl Madariaga, Luce Fleitout; The Seismic Sequence of the 16 September 2015 Mw 8.3 Illapel, Chile, Earthquake. Seismological Research Letters 2016;; 87 (4): 789–799. doi: https://doi.org/10.1785/0220150281 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySeismological Research Letters Search Advanced Search ABSTRACT On 16 September 2015, the Mw 8.3 Illapel, Chile, earthquake broke a large area of the Coquimbo region of north‐central Chile. This area was well surveyed by more than 15 high‐rate Global Positioning System (GPS) instruments, installed starting in 2004, and by the new national seismological network deployed in Chile. Previous studies had shown that the Coquimbo region near Illapel was coupled to about 60%. After the Mw 8.8 Maule megathrust earthquake of 27 February 2010, we observed a large‐scale postseismic deformation, which resulted in a strain rate increase of about 15% in the region of Illapel. This observation agrees with our modeling of viscous relaxation after the Maule earthquake. The area where upper‐plate GPS velocity increased coincides very well with the slip distribution of the Illapel earthquake inverted from GPS measurements of coseismic displacement. The mainshock started with a small‐amplitude nucleation phase that lasted 20 s. Backprojection of seismograms recorded in North America confirms the extent of the rupture, determined from local observations, and indicates a strong directivity from deeper to shallower rupture areas. The coseismic displacement shows an elliptical slip distribution of about 200 km×100 km with a localized zone where the rupture is deeper near 31.3° S. This distribution is consistent with the uplift observed in some GPS sites and inferred from field observations of bleached coralline algae in the Illapel coastal area. Most of aftershocks relocated in this study were interplate events, although some of the events deeper than 50 km occurred inside the Nazca plate and had tension (slab‐pull) mechanisms. The majority of the aftershocks were located outside the 5 m contour line of the inferred slip distribution of the mainshock. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.