Variable seismic anisotropy across the Peruvian flat-slab subduction zone with implications for upper plate deformation

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dc.contributor.authorCondori, Cristobal
dc.contributor.authorFrança, George S.
dc.contributor.authorTavera, Hernando
dc.contributor.authorEakin, Caroline M.
dc.contributor.authorLynner, Colton
dc.contributor.authorBeck, Susan L.
dc.contributor.authorVillegas Lanza, Juan Carlos
dc.coverage.spatialPerú
dc.date.accessioned2021-04-29T11:38:44Z
dc.date.available2021-04-29T11:38:44Z
dc.date.issued2021-03
dc.description.abstractWe performed shear wave splitting analyses to investigate seismic anisotropy across the northern extent of the Peruvian flat-slab subduction region. We used core-mantle refracted SKS, SKKS and PKS phases from teleseismic events (88° > Δ < 150°) recorded at 45 broadband seismic stations from the Peruvian permanent and portable seismic networks as well as from, international networks (CTBTO, RSBR-Brazil, and RENSIG-Ecuador). The results reveal a complex anisotropy pattern with distinct variations in shear wave splitting along strike. In the northernmost region, the mean delay times range between 1.0 ± 0.2 s and 1.5 ± 0.2 s with fast directions predominantly oriented ENE-WSW approximately perpendicular to the trench, parallel with the motion of the subducting Nazca plate. In the central region of Peru, the predominant fast directions change to a SE-NW orientation that is oblique with the trench. These fast splitting directions are consistent with the pattern seen previously over the southern extent of the flat-slab and correlate well with the current geodetically derived motion of the overriding forearc, the Peruvian Sliver. These characteristics suggest a fundamental change in anisotropic behavior between the northern and central portions of the Peruvian flat-slab and imply that the upper plate deformation is a controlling factor.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationCondori, C., França, G. S., Tavera, H. J., Eakin, C. M., Lynner, C., Beck, S. L., & Villegas-Lanza, J. C. (2021). Variable seismic anisotropy across the Peruvian flat-slab subduction zone with implications for upper plate deformation.==$Journal of South American Earth Sciences, 106,$==103053. https://doi.org/10.1016/j.jsames.2020.103053es_ES
dc.identifier.doihttps://doi.org/10.1016/j.jsames.2020.103053es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalJournal of South American Earth Scienceses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/4939
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.ispartofurn:issn:0895-9811
dc.rightsinfo:eu-repo/semantics/closedAccesses_ES
dc.subjectSeismic anisotropyes_ES
dc.subjectShear wave splittinges_ES
dc.subjectFlat-slab subductiones_ES
dc.subjectNorthern Perues_ES
dc.subject.ocdehttps://purl.org/pe-repo/ocde/ford#1.05.04es_ES
dc.subject.ocdehttps://purl.org/pe-repo/ocde/ford#1.05.06es_ES
dc.titleVariable seismic anisotropy across the Peruvian flat-slab subduction zone with implications for upper plate deformationes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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