Portal de Periódicos da CAPES

Constructing forearc architecture over megathrust seismic cycles: Geological snapshots from the Maule earthquake region, Chile

2014; Geological Society of America; Volume: 127; Issue: 3-4 Linguagem: Inglês

10.1130/b31125.1

1943-2674

Felipe Aron, José Cembrano, F. Astudillo, Richard W. Allmendinger, Gloria Arancibia,

Geological and Geochemical Analysis

Research Article| March 01, 2015 Constructing forearc architecture over megathrust seismic cycles: Geological snapshots from the Maule earthquake region, Chile Felipe Aron; Felipe Aron 1Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, New York 14853, USA †Current address: Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305; faa32@cornell.edu. Search for other works by this author on: GSW Google Scholar José Cembrano; José Cembrano 2Departamento de Ingeniería Estructural y Geotécnica, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile3National Research Center for Integrated Natural Disasters Management (CIGIDEN), Vicuña Mackenna 4860, Macul, Santiago, Chile4Centro de Excelencia en Geotermia de los Andes (CEGA, Fondap-Conicyt, 15090013), Plaza Ercilla 803, Santiago, Chile Search for other works by this author on: GSW Google Scholar Felipe Astudillo; Felipe Astudillo 5Departamento de Ciencias Geológicas, Universidad Católica del Norte, Avenida Angamos 0610, Antofagasta, Chile Search for other works by this author on: GSW Google Scholar Richard W. Allmendinger; Richard W. Allmendinger 1Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, New York 14853, USA Search for other works by this author on: GSW Google Scholar Gloria Arancibia Gloria Arancibia 2Departamento de Ingeniería Estructural y Geotécnica, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile4Centro de Excelencia en Geotermia de los Andes (CEGA, Fondap-Conicyt, 15090013), Plaza Ercilla 803, Santiago, Chile Search for other works by this author on: GSW Google Scholar Author and Article Information Felipe Aron †Current address: Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305; faa32@cornell.edu. 1Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, New York 14853, USA José Cembrano 2Departamento de Ingeniería Estructural y Geotécnica, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile3National Research Center for Integrated Natural Disasters Management (CIGIDEN), Vicuña Mackenna 4860, Macul, Santiago, Chile4Centro de Excelencia en Geotermia de los Andes (CEGA, Fondap-Conicyt, 15090013), Plaza Ercilla 803, Santiago, Chile Felipe Astudillo 5Departamento de Ciencias Geológicas, Universidad Católica del Norte, Avenida Angamos 0610, Antofagasta, Chile Richard W. Allmendinger 1Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, New York 14853, USA Gloria Arancibia 2Departamento de Ingeniería Estructural y Geotécnica, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile4Centro de Excelencia en Geotermia de los Andes (CEGA, Fondap-Conicyt, 15090013), Plaza Ercilla 803, Santiago, Chile Publisher: Geological Society of America Received: 29 Apr 2014 Revision Received: 29 Jul 2014 Accepted: 27 Aug 2014 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2014 Geological Society of America GSA Bulletin (2015) 127 (3-4): 464–479. https://doi.org/10.1130/B31125.1 Article history Received: 29 Apr 2014 Revision Received: 29 Jul 2014 Accepted: 27 Aug 2014 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Felipe Aron, José Cembrano, Felipe Astudillo, Richard W. Allmendinger, Gloria Arancibia; Constructing forearc architecture over megathrust seismic cycles: Geological snapshots from the Maule earthquake region, Chile. GSA Bulletin 2015;; 127 (3-4): 464–479. doi: https://doi.org/10.1130/B31125.1 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 SocietyGSA Bulletin Search Advanced Search Abstract We present new field structural data from the Chilean Coastal Cordillera located above the northern and central parts of the interplate contact ruptured by the A.D. 2010 Mw 8.8 Maule earthquake. The northern study area contains the northwest-striking Pichilemu normal fault, an intraplate structure reactivated after the megathrust event by crustal earthquakes up to Mw 7.0. The structural style of this region is dominated by kilometer-scale normal faults that have been active at least throughout the Quaternary. The orientations of these main faults define three structural systems: (1) northeast- and (2) northwest-striking margin-oblique faults, and (3) north- to north-northeast–striking margin-parallel faults. From north to south, these three systems vary in their predominant occurrence, starting with bimodal orientations of groups 1 and 2, followed by predominantly single north to north-northeast orientations of group 3. Reverse faults coexist in time and space with the normal structures, but are scarce and display variable, apparently random orientations. The shallow crustal normal faults, including the Pichilemu fault, show a persistent kinematic history probably spanning thousands of subduction seismic cycles. Though historically smaller in magnitude than those of the triggered normal faults, interseismic forearc thrust events were recorded above the rupture area prior to the Maule earthquake. The Quaternary reverse faults identified in our study regions may be preserving interseismic, slow-strain-rate, permanent deformation signature in the structural grain. Analogous observations along the A.D. 2011 Tohoku earthquake rupture in Japan imply that such a link between the short- and long-term deformation patterns of the forearc is not exclusive of the Maule earthquake region. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.