Nature and tectonic significance of co-seismic structures associated with the Mw 8.8 Maule earthquake, central-southern Chile forearc

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dc.contributor.authorArriagada, C.
dc.contributor.authorArancibia, G.
dc.contributor.authorCembrano, J.
dc.contributor.authorMartinez, F.
dc.contributor.authorCarrizo, D.
dc.contributor.authorVan Sint Jan, M.
dc.contributor.authorSaez, E.
dc.contributor.authorGonzalez, G.
dc.contributor.authorRebolledo, S.
dc.contributor.authorSepulveda, S. A.
dc.contributor.authorContreras Reyes, E.
dc.contributor.authorJensen, E.
dc.contributor.authorYanez, G.
dc.date.accessioned2024-01-10T13:15:22Z
dc.date.available2024-01-10T13:15:22Z
dc.date.issued2011
dc.description.abstractThe Mw 8.8 Maule earthquake on February 27, 2010 affected the central-southern Chilean forearc of the Central Andes. Here we show the results of field investigations of surface deformation associated with this major earthquake. Observations were carried out within three weeks after the seismic event, mostly in the central and northern part of the forearc overlying the rupture zone. We provide a detailed field record of co-seismic surface deformation and examine its implications on active Andean tectonics. Surface rupture consisted primarily of extensional cracks, push-up structures, fissures with minor lateral displacements and a few but impressive extensional geometries similar to those observed in analogical modeling of rift systems. A major group of NW-WNW striking fractures representing co-seismic extensional deformation is found at all localities. These appear to be spatially correlated to long-lived basement fault zones. The NW-striking normal focal mechanism of the Mw 6.9 aftershock occurred on March 11 demonstrates that the basement faults were reactivated by the Mw 8.8 Maule earthquake. The co-seismic surface ruptures show patterns of distributed deformation similar to those observed in mapped basement-involved structures. We propose that co-seismic reactivation of basement structures play a fundamental role in stress release in the upper plate during large subduction earthquakes. The fundamental mechanism that promotes stress relaxation is largely driven by elastic rebound of the upper plate located right above the main rupture zone. (C) 2011 Elsevier Ltd. All rights reserved.
dc.description.funderEngineering and Geotechnical Department, Universidad Catolica de Chile
dc.description.funderDepartamento de Geologia and Departamento de Geofisica at the Universidad de Chile
dc.description.funderDepartamento de Ciencias Geologicas de la Universidad Catolica del Norte
dc.fechaingreso.objetodigital01-04-2024
dc.format.extent7 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.jsg.2011.03.004
dc.identifier.issn0191-8141
dc.identifier.urihttps://doi.org/10.1016/j.jsg.2011.03.004
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/78496
dc.identifier.wosidWOS:000290828000008
dc.information.autorucIngeniería;Arancibia G ;S/I;1008583
dc.information.autorucIngeniería;Cembrano J;S/I;1008585
dc.information.autorucIngeniería;Saez E;S/I;1007694
dc.information.autorucIngeniería;Van Sint Jan M;S/I;99162
dc.issue.numero5
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final897
dc.pagina.inicio891
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.revistaJOURNAL OF STRUCTURAL GEOLOGY
dc.rightsacceso restringido
dc.subjectco-seismic
dc.subjectMw 8.8 Maule earthquake
dc.subjectcentral southern Chile forearc
dc.subjectactive tectonics
dc.subjectCRUSTAL DEFORMATION
dc.subjectSUBDUCTION ZONE
dc.subjectNORTHERN CHILE
dc.subjectMARGIN
dc.subjectANTOFAGASTA
dc.subjectSLIP
dc.subject.ods11 Sustainable Cities and Communities
dc.subject.odspa11 Ciudades y comunidades sostenibles
dc.titleNature and tectonic significance of co-seismic structures associated with the Mw 8.8 Maule earthquake, central-southern Chile forearc
dc.typeartículo
dc.volumen33
sipa.codpersvinculados1008583
sipa.codpersvinculados1008585
sipa.codpersvinculados1007694
sipa.codpersvinculados99162
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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