scholarly journals Subduction dynamics and structural controls on shear wave splitting along the South American convergent margin

2020 ◽  
Vol 104 ◽  
pp. 102824
Author(s):  
Colton Lynner ◽  
Susan L. Beck
Keyword(s):  
Shear Wave ◽  
Shear Wave Splitting ◽  
South American ◽  
The South ◽  
Convergent Margin ◽  
Structural Controls ◽  
Wave Splitting

scholarly journals CRUSTAL SEISMIC ANISOTROPY AT THE EDGE OF THE SOUTH-EAST BORDER OF CARIBBEAN AND SOUTH AMERICAN PLATES

2013 ◽  
Vol 31 (4) ◽  
pp. 595
Author(s):  
Tomislav E. Monjak Espinoza ◽  
Laura Teresa Piñero Feliciangeli
Keyword(s):  
Shear Wave ◽  
Seismic Anisotropy ◽  
Shear Wave Splitting ◽  
Mantle Flow ◽  
Fast Wave ◽  
South American ◽  
The South ◽  
Large Variability ◽  
Wave Splitting ◽  
The Caribbean

ABSTRACT. Anisotropic properties in the NE of the Caribbean-South American plate are investigated based on the analysis of shear-wave splitting from new S local phase data. At the collisional front in the Caribbean and the South American plates and within the retro-arc region, fast wave polarization from local S phases show considerable variability. δt are small (<0.14 s) and no dependence with depth is observed suggesting the presence of an heterogeneous anisotropic region confined to the crust and that most of the upper-mantle wedge is isotropic. In the fore-arc, φ is fairly constant, the average value is sub-parallel to the Lesser Antilles trench and differs from teleseismic result, which is perpendicular to the trench, which suggests that the crust and mantle are decoupled. The difference between the δt found in S local events and teleseismic, suggests that there is another source of deep anisotropy, which can be attributed to mantle flow underneath or around the edges of the subducting Atlantic plate beneath the Caribbean. A mix combination of deformation mechanism such as micro-fractures EDA and vertical foliation on metamorphic rocks could be responsible for the large variability found for δt in S local phases in this region.Keywords: seismic anisotropy, deformation mechanisms, shear-wave splitting, crust, mantle RESUMEN. Se investigan las características anisotrópicas en el NE de la placa Caribe-Sur América basados en el análisis de nuevos resultados del desdoblamiento de ondas de corte en fases locales S. En el frente de colisión entre placa Caribe y Suramerica y en la zona de retro-arco, la polarización de onda rápida en eventos locales S muestran considerable variabilidad. Los δt son pequeños (<0,14s) y no presenta dependencia con la profundidad, sugiriendo la presencia de una región anisotropícamente heterogenea confinada a la corteza, siendo además la cuña del manto superior isotrópico. En el ante-arco, φ es poco variable, el valor promedio es sub-paralello a la trinchera de las Antillas Menores y difiere del valor obtenido para fases telesísmicas el cual es perpendicular a la trinchera, lo cual sugiere que la corteza y el manto en esta zona se encuentran desacoplados. La diferencia entre los δt en eventos locales S y telesísmicos, sugiere que existe otra fuente de anisotropía profunda, que se puede atribuir a flujo mantélico debajo o alrededor de los bordes de la placa Atlántica en subducción debajo del Caribe. Una combinación de mecanismos de deformación, tales como micro-fracturas EDA y foliación vertical en rocas metamórficas podría ser responsable de la gran variabilidad encontrada en los δt en fases S locales en esta región.Palabras claves: anisotropía sísmica, mecanismos de deformación, doblamiento de ondas de corte, corteza, manto.

Seismic anisotropy in the south western Pacific region from shear wave splitting

2012 ◽  
Vol 39 (5) ◽  
pp. n/a-n/a ◽  
Author(s):  
Eszter Király ◽  
Irene Bianchi ◽  
Götz Bokelmann
Keyword(s):  
Shear Wave ◽  
Seismic Anisotropy ◽  
Shear Wave Splitting ◽  
Western Pacific ◽  
Pacific Region ◽  
Western Pacific Region ◽  
The South ◽  
Wave Splitting

Constraints on mantle flow at the Caribbean–South American plate boundary inferred from shear wave splitting

2009 ◽  
Vol 114 (B2) ◽  
Author(s):  
Mark A. Growdon ◽  
Gary L. Pavlis ◽  
Fenglin Niu ◽  
Frank L. Vernon ◽  
Herbert Rendon
Keyword(s):  
Shear Wave ◽  
Plate Boundary ◽  
Shear Wave Splitting ◽  
Mantle Flow ◽  
South American ◽  
South American Plate ◽  
Wave Splitting ◽  
The Caribbean

scholarly journals Characteristics of mantle fabrics beneath the south-central United States: Constraints from shear-wave splitting measurements

Geosphere ◽  
2008 ◽  
Vol 4 (2) ◽  
pp. 411 ◽  
Author(s):  
Stephen S. Gao ◽  
Kelly H. Liu ◽  
Robert J. Stern ◽  
G. Randy Keller ◽  
John P. Hogan ◽  
...  
Keyword(s):  
United States ◽  
Shear Wave ◽  
Shear Wave Splitting ◽  
The South ◽  
South Central ◽  
Wave Splitting ◽  
Central United States

scholarly journals Mantle flow in the South Sandwich subduction environment from source-side shear wave splitting

2008 ◽  
Vol 35 (3) ◽  
Author(s):  
Christian Müller ◽  
Bettina Bayer ◽  
Alfons Eckstaller ◽  
Heinrich Miller
Keyword(s):  
Shear Wave ◽  
Shear Wave Splitting ◽  
Mantle Flow ◽  
The South ◽  
Wave Splitting

scholarly journals Insight into NE Tibetan Plateau expansion from crustal and upper mantle anisotropy revealed by shear-wave splitting

2017 ◽  
Vol 478 ◽  
pp. 66-75 ◽  
Author(s):  
Zhouchuan Huang ◽  
Frederik Tilmann ◽  
Mingjie Xu ◽  
Liangshu Wang ◽  
Zhifeng Ding ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Shear Wave ◽  
Upper Mantle ◽  
Shear Wave Splitting ◽  
Upper Mantle Anisotropy ◽  
Wave Splitting ◽  
Mantle Anisotropy ◽  
Insight Into ◽  
Ne Tibetan Plateau
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