Response of the mantle to flat slab evolution: Insights from local S splitting beneath Peru

Caroline M. Eakin, Maureen D. Long, Susan L. Beck, Lara S. Wagner, Hernando Tavera, Cristobal Condori Quispe

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

26 Citas (Scopus)

Resumen

The dynamics of flat subduction, particularly the interaction between a flat slab and the overriding plate, are poorly understood. Here we study the (seismically) anisotropic properties and deformational regime of the mantle directly above the Peruvian flat slab. We analyze shear wave splitting from 370 local S events at 49 stations across southern Peru. We find that the mantle above the flat slab appears to be anisotropic, with modest average delay times (∼0.28s) that are consistent with ∼4% anisotropy in a ∼30km thick mantle layer. The most likely mechanism is the lattice-preferred orientation of olivine, which suggests that the observed splitting pattern preserves information about the mantle deformation. We observe a pronounced change in anisotropy along strike, with predominately trench-parallel fast directions in the north and more variable orientations in the south, which we attribute to the ongoing migration of the Nazca Ridge through the flat slab system.

Idioma originalInglés
Páginas (desde-hasta)3438-3446
Número de páginas9
PublicaciónGeophysical Research Letters
Volumen41
N.º10
DOI
EstadoPublicada - 28 may. 2014
Publicado de forma externa

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