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dc.contributor.authorLynner, Colton
dc.contributor.authorKoch, Clinton
dc.contributor.authorBeck, Susan L
dc.contributor.authorMeltzer, Anne
dc.contributor.authorSoto-Cordero, Lillian
dc.contributor.authorHoskins, Mariah C
dc.contributor.authorStachnik, Josh C
dc.contributor.authorRuiz, Mario
dc.contributor.authorAlvarado, Alexandra
dc.contributor.authorCharvis, Philippe
dc.contributor.authorFont, Yvonne
dc.contributor.authorRegnier, Marc
dc.contributor.authorAgurto-Detzel, Hans
dc.contributor.authorRietbrock, Andreas
dc.contributor.authorPorritt, Robert W
dc.date.accessioned2020-06-09T19:10:53Z
dc.date.available2020-06-09T19:10:53Z
dc.date.issued2020-03
dc.identifier.citationColton Lynner, Clinton Koch, Susan L Beck, Anne Meltzer, Lillian Soto-Cordero, Mariah C Hoskins, Josh C Stachnik, Mario Ruiz, Alexandra Alvarado, Philippe Charvis, Yvonne Font, Marc Regnier, Hans Agurto-Detzel, Andreas Rietbrock, Robert W Porritt, Upper-plate structure in Ecuador coincident with the subduction of the Carnegie Ridge and the southern extent of large mega-thrust earthquakes, Geophysical Journal International, Volume 220, Issue 3, March 2020, Pages 1965–1977, https://doi.org/10.1093/gji/ggz558en_US
dc.identifier.issn0956-540X
dc.identifier.doi10.1093/gji/ggz558
dc.identifier.urihttp://hdl.handle.net/10150/641541
dc.description.abstractThe Ecuadorian convergent margin has experienced many large mega-thrust earthquakes in the past century, beginning with a 1906 event that propagated along as much as 500 km of the plate interface. Many subsections of the 1906 rupture area have subsequently produced M-w >= 7.7 events, culminating in the 16 April 2016, M-w 7.8 Pedernales earthquake. Interestingly, no large historic events M-w >= 7.7 appear to have propagated southward of similar to 1 degrees S, which coincides with the subduction of the Carnegie Ridge. We combine data from temporary seismic stations deployed following the Pedernales earthquake with data recorded by the permanent stations of the Ecuadorian national seismic network to discern the velocity structure of the Ecuadorian forearc and Cordillera using ambient noise tomography. Ambient noise tomography extracts V-sv information from the ambient noise wavefield and provides detailed constraints on velocity structures in the crust and upper mantle. In the upper 10 km of the Ecuadorian forearc, we see evidence of the deepest portions of the sedimentary basins in the region, the Progreso and Manabi basins. At depths below 30 km, we observe a sharp delineation between accreted fast forearc terranes and the thick crust of the Ecuadorian Andes. At depths similar to 20 km, we see a strong fast velocity anomaly that coincides with the subducting Carnegie Ridge as well as the southern boundary of large mega-thrust earthquakes. Our observations raise the possibility that upper-plate structure, in addition to the subducting Carnegie Ridge, plays a role in the large event segmentation seen along the Ecuadorian margin.en_US
dc.language.isoenen_US
dc.publisherOXFORD UNIV PRESSen_US
dc.rights© The Author(s) 2019. Published by Oxford University Press on behalf of The Royal Astronomical Society.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectCrustal imagingen_US
dc.subjectSeismic noiseen_US
dc.subjectCrustal structureen_US
dc.titleUpper-plate structure in Ecuador coincident with the subduction of the Carnegie Ridge and the southern extent of large mega-thrust earthquakesen_US
dc.typeArticleen_US
dc.identifier.eissn1365-246X
dc.contributor.departmentUniv Arizona, Dept Geoscien_US
dc.identifier.journalGEOPHYSICAL JOURNAL INTERNATIONALen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleGeophysical Journal International
dc.source.volume220
dc.source.issue3
dc.source.beginpage1965
dc.source.endpage1977
refterms.dateFOA2020-06-09T19:10:55Z


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