Shear wave splitting and shear wave splitting tomography of the southern Puna plateau
- Autores
- Calixto, Frank J.; Robinson, Danielle; Sandvol, Eric; Kay, Suzanne; Abt, David; Fischer, Karen; Heit, Ben; Yuan, Xiaohui; Comte, Diana; Alvarado, Patricia Monica
- Año de publicación
- 2014
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- We have investigated the seismic anisotropy beneath the Central Andean southern Puna plateau by applying shear wave splitting analysis and shear wave splitting tomography to local S waves and teleseismic SKS, SKKS and PKS phases. Overall, a very complex pattern of fast directions throughout the southern Puna plateau region and a circular pattern of fast directions around the region of the giant Cerro Galan ignimbrite complex are observed. In general, teleseismic lag times are much greater than those for local events which are interpreted to reflect a significant amount of sub and inner slab anisotropy. The complex pattern observed from shear wave splitting analysis alone is the result of a complex 3-D anisotropic structure under the southern Puna plateau. Our application of shear wave splitting tomography provides a 3-D model of anisotropy in the southern Puna plateau that shows different patterns depending on the driving mechanism of upper-mantle flow and seismic anisotropy. The trench parallel a-axes in the continental lithosphere above the slab east of 68W may be related to deformation of the overriding continental lithosphere since it is under compressive stresses which are orthogonal to the trench. The more complex pattern below the Cerro Galan ignimbrite complex and above the slab is interpreted to reflect delamination of continental lithosphere and upwelling of hot asthenosphere. The a-axes beneath the Cerro Galan, Cerro Blanco and Carachi Pampa volcanic centres at 100 km depth show some weak evidence for vertically orientated fast directions, which could be due to vertical asthenospheric flow around a delaminated block. Additionally, our splitting tomographic model shows that there is a significant amount of seismic anisotropy beneath the slab. The subslab mantle west of 68W shows roughly trench parallel horizontal a-axes that are probably driven by slab roll back and the relatively small coupling between the Nazca slab and the underlying mantle. In contrast, the subslab region (i.e. depths greater than 200 km) east of 68W shows a circular pattern of a-axes centred on a region with small strength of anisotropy (Cerro Galan and its eastern edge) which suggest the dominant mechanism is a combination of slab roll back and flow driven by an overlying abnormally heated slab or possibly a slab gap. There seems to be some evidence for vertical flow below the slab at depths of 200–400 km driven by the abnormally heated slab or slab gap. This cannot be resolved by the tomographic inversion due to the lack of ray crossings in the subslab mantle.
Fil: Calixto, Frank J.. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos
Fil: Robinson, Danielle. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos. Newfield Exploration Company; Estados Unidos
Fil: Sandvol, Eric. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos
Fil: Kay, Suzanne. Cornell University Ithaca. Department of Earth and Atmospheric Sciences; Estados Unidos
Fil: Abt, David. ExxonMobil Exploration Company; Estados Unidos
Fil: Fischer, Karen. Brown University. Department of Geological Sciences; Estados Unidos
Fil: Heit, Ben. GeoForschungsZentrum Potsdam; Alemania
Fil: Yuan, Xiaohui. Universidad de Chile. Departmento de Geofisica; Chile
Fil: Comte, Diana. Universidad de Chile. Departmento de Geofisica; Chile
Fil: Alvarado, Patricia Monica. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Geofísica y Astronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Juan. Centro de Investigaciones de la Geosfera y Biosfera; Argentina - Materia
-
Seismic Anisotropy
Seismic Tomography
Continental Margins
Subduction Zone - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/5004
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Shear wave splitting and shear wave splitting tomography of the southern Puna plateauCalixto, Frank J.Robinson, DanielleSandvol, EricKay, SuzanneAbt, DavidFischer, KarenHeit, BenYuan, XiaohuiComte, DianaAlvarado, Patricia MonicaSeismic AnisotropySeismic TomographyContinental MarginsSubduction Zonehttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1We have investigated the seismic anisotropy beneath the Central Andean southern Puna plateau by applying shear wave splitting analysis and shear wave splitting tomography to local S waves and teleseismic SKS, SKKS and PKS phases. Overall, a very complex pattern of fast directions throughout the southern Puna plateau region and a circular pattern of fast directions around the region of the giant Cerro Galan ignimbrite complex are observed. In general, teleseismic lag times are much greater than those for local events which are interpreted to reflect a significant amount of sub and inner slab anisotropy. The complex pattern observed from shear wave splitting analysis alone is the result of a complex 3-D anisotropic structure under the southern Puna plateau. Our application of shear wave splitting tomography provides a 3-D model of anisotropy in the southern Puna plateau that shows different patterns depending on the driving mechanism of upper-mantle flow and seismic anisotropy. The trench parallel a-axes in the continental lithosphere above the slab east of 68W may be related to deformation of the overriding continental lithosphere since it is under compressive stresses which are orthogonal to the trench. The more complex pattern below the Cerro Galan ignimbrite complex and above the slab is interpreted to reflect delamination of continental lithosphere and upwelling of hot asthenosphere. The a-axes beneath the Cerro Galan, Cerro Blanco and Carachi Pampa volcanic centres at 100 km depth show some weak evidence for vertically orientated fast directions, which could be due to vertical asthenospheric flow around a delaminated block. Additionally, our splitting tomographic model shows that there is a significant amount of seismic anisotropy beneath the slab. The subslab mantle west of 68W shows roughly trench parallel horizontal a-axes that are probably driven by slab roll back and the relatively small coupling between the Nazca slab and the underlying mantle. In contrast, the subslab region (i.e. depths greater than 200 km) east of 68W shows a circular pattern of a-axes centred on a region with small strength of anisotropy (Cerro Galan and its eastern edge) which suggest the dominant mechanism is a combination of slab roll back and flow driven by an overlying abnormally heated slab or possibly a slab gap. There seems to be some evidence for vertical flow below the slab at depths of 200–400 km driven by the abnormally heated slab or slab gap. This cannot be resolved by the tomographic inversion due to the lack of ray crossings in the subslab mantle.Fil: Calixto, Frank J.. University of Missouri-Columbia. Department of Geological Sciences; Estados UnidosFil: Robinson, Danielle. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos. Newfield Exploration Company; Estados UnidosFil: Sandvol, Eric. University of Missouri-Columbia. Department of Geological Sciences; Estados UnidosFil: Kay, Suzanne. Cornell University Ithaca. Department of Earth and Atmospheric Sciences; Estados UnidosFil: Abt, David. ExxonMobil Exploration Company; Estados UnidosFil: Fischer, Karen. Brown University. Department of Geological Sciences; Estados UnidosFil: Heit, Ben. GeoForschungsZentrum Potsdam; AlemaniaFil: Yuan, Xiaohui. Universidad de Chile. Departmento de Geofisica; ChileFil: Comte, Diana. Universidad de Chile. Departmento de Geofisica; ChileFil: Alvarado, Patricia Monica. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Geofísica y Astronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Juan. Centro de Investigaciones de la Geosfera y Biosfera; ArgentinaWiley2014-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/5004Calixto, Frank J.; Robinson, Danielle; Sandvol, Eric; Kay, Suzanne; Abt, David; et al.; Shear wave splitting and shear wave splitting tomography of the southern Puna plateau; Wiley; Geophysical Journal International; 199; 2; 11-2014; 688-6990956-540Xenginfo:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggu296info:eu-repo/semantics/altIdentifier/url/http://gji.oxfordjournals.org/content/199/2/688.full?keytype=ref&ijkey=C143wck5jj1Ds8uinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:09:11Zoai:ri.conicet.gov.ar:11336/5004instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:09:11.323CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Shear wave splitting and shear wave splitting tomography of the southern Puna plateau |
title |
Shear wave splitting and shear wave splitting tomography of the southern Puna plateau |
spellingShingle |
Shear wave splitting and shear wave splitting tomography of the southern Puna plateau Calixto, Frank J. Seismic Anisotropy Seismic Tomography Continental Margins Subduction Zone |
title_short |
Shear wave splitting and shear wave splitting tomography of the southern Puna plateau |
title_full |
Shear wave splitting and shear wave splitting tomography of the southern Puna plateau |
title_fullStr |
Shear wave splitting and shear wave splitting tomography of the southern Puna plateau |
title_full_unstemmed |
Shear wave splitting and shear wave splitting tomography of the southern Puna plateau |
title_sort |
Shear wave splitting and shear wave splitting tomography of the southern Puna plateau |
dc.creator.none.fl_str_mv |
Calixto, Frank J. Robinson, Danielle Sandvol, Eric Kay, Suzanne Abt, David Fischer, Karen Heit, Ben Yuan, Xiaohui Comte, Diana Alvarado, Patricia Monica |
author |
Calixto, Frank J. |
author_facet |
Calixto, Frank J. Robinson, Danielle Sandvol, Eric Kay, Suzanne Abt, David Fischer, Karen Heit, Ben Yuan, Xiaohui Comte, Diana Alvarado, Patricia Monica |
author_role |
author |
author2 |
Robinson, Danielle Sandvol, Eric Kay, Suzanne Abt, David Fischer, Karen Heit, Ben Yuan, Xiaohui Comte, Diana Alvarado, Patricia Monica |
author2_role |
author author author author author author author author author |
dc.subject.none.fl_str_mv |
Seismic Anisotropy Seismic Tomography Continental Margins Subduction Zone |
topic |
Seismic Anisotropy Seismic Tomography Continental Margins Subduction Zone |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
We have investigated the seismic anisotropy beneath the Central Andean southern Puna plateau by applying shear wave splitting analysis and shear wave splitting tomography to local S waves and teleseismic SKS, SKKS and PKS phases. Overall, a very complex pattern of fast directions throughout the southern Puna plateau region and a circular pattern of fast directions around the region of the giant Cerro Galan ignimbrite complex are observed. In general, teleseismic lag times are much greater than those for local events which are interpreted to reflect a significant amount of sub and inner slab anisotropy. The complex pattern observed from shear wave splitting analysis alone is the result of a complex 3-D anisotropic structure under the southern Puna plateau. Our application of shear wave splitting tomography provides a 3-D model of anisotropy in the southern Puna plateau that shows different patterns depending on the driving mechanism of upper-mantle flow and seismic anisotropy. The trench parallel a-axes in the continental lithosphere above the slab east of 68W may be related to deformation of the overriding continental lithosphere since it is under compressive stresses which are orthogonal to the trench. The more complex pattern below the Cerro Galan ignimbrite complex and above the slab is interpreted to reflect delamination of continental lithosphere and upwelling of hot asthenosphere. The a-axes beneath the Cerro Galan, Cerro Blanco and Carachi Pampa volcanic centres at 100 km depth show some weak evidence for vertically orientated fast directions, which could be due to vertical asthenospheric flow around a delaminated block. Additionally, our splitting tomographic model shows that there is a significant amount of seismic anisotropy beneath the slab. The subslab mantle west of 68W shows roughly trench parallel horizontal a-axes that are probably driven by slab roll back and the relatively small coupling between the Nazca slab and the underlying mantle. In contrast, the subslab region (i.e. depths greater than 200 km) east of 68W shows a circular pattern of a-axes centred on a region with small strength of anisotropy (Cerro Galan and its eastern edge) which suggest the dominant mechanism is a combination of slab roll back and flow driven by an overlying abnormally heated slab or possibly a slab gap. There seems to be some evidence for vertical flow below the slab at depths of 200–400 km driven by the abnormally heated slab or slab gap. This cannot be resolved by the tomographic inversion due to the lack of ray crossings in the subslab mantle. Fil: Calixto, Frank J.. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos Fil: Robinson, Danielle. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos. Newfield Exploration Company; Estados Unidos Fil: Sandvol, Eric. University of Missouri-Columbia. Department of Geological Sciences; Estados Unidos Fil: Kay, Suzanne. Cornell University Ithaca. Department of Earth and Atmospheric Sciences; Estados Unidos Fil: Abt, David. ExxonMobil Exploration Company; Estados Unidos Fil: Fischer, Karen. Brown University. Department of Geological Sciences; Estados Unidos Fil: Heit, Ben. GeoForschungsZentrum Potsdam; Alemania Fil: Yuan, Xiaohui. Universidad de Chile. Departmento de Geofisica; Chile Fil: Comte, Diana. Universidad de Chile. Departmento de Geofisica; Chile Fil: Alvarado, Patricia Monica. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Geofísica y Astronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Juan. Centro de Investigaciones de la Geosfera y Biosfera; Argentina |
description |
We have investigated the seismic anisotropy beneath the Central Andean southern Puna plateau by applying shear wave splitting analysis and shear wave splitting tomography to local S waves and teleseismic SKS, SKKS and PKS phases. Overall, a very complex pattern of fast directions throughout the southern Puna plateau region and a circular pattern of fast directions around the region of the giant Cerro Galan ignimbrite complex are observed. In general, teleseismic lag times are much greater than those for local events which are interpreted to reflect a significant amount of sub and inner slab anisotropy. The complex pattern observed from shear wave splitting analysis alone is the result of a complex 3-D anisotropic structure under the southern Puna plateau. Our application of shear wave splitting tomography provides a 3-D model of anisotropy in the southern Puna plateau that shows different patterns depending on the driving mechanism of upper-mantle flow and seismic anisotropy. The trench parallel a-axes in the continental lithosphere above the slab east of 68W may be related to deformation of the overriding continental lithosphere since it is under compressive stresses which are orthogonal to the trench. The more complex pattern below the Cerro Galan ignimbrite complex and above the slab is interpreted to reflect delamination of continental lithosphere and upwelling of hot asthenosphere. The a-axes beneath the Cerro Galan, Cerro Blanco and Carachi Pampa volcanic centres at 100 km depth show some weak evidence for vertically orientated fast directions, which could be due to vertical asthenospheric flow around a delaminated block. Additionally, our splitting tomographic model shows that there is a significant amount of seismic anisotropy beneath the slab. The subslab mantle west of 68W shows roughly trench parallel horizontal a-axes that are probably driven by slab roll back and the relatively small coupling between the Nazca slab and the underlying mantle. In contrast, the subslab region (i.e. depths greater than 200 km) east of 68W shows a circular pattern of a-axes centred on a region with small strength of anisotropy (Cerro Galan and its eastern edge) which suggest the dominant mechanism is a combination of slab roll back and flow driven by an overlying abnormally heated slab or possibly a slab gap. There seems to be some evidence for vertical flow below the slab at depths of 200–400 km driven by the abnormally heated slab or slab gap. This cannot be resolved by the tomographic inversion due to the lack of ray crossings in the subslab mantle. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-11 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/5004 Calixto, Frank J.; Robinson, Danielle; Sandvol, Eric; Kay, Suzanne; Abt, David; et al.; Shear wave splitting and shear wave splitting tomography of the southern Puna plateau; Wiley; Geophysical Journal International; 199; 2; 11-2014; 688-699 0956-540X |
url |
http://hdl.handle.net/11336/5004 |
identifier_str_mv |
Calixto, Frank J.; Robinson, Danielle; Sandvol, Eric; Kay, Suzanne; Abt, David; et al.; Shear wave splitting and shear wave splitting tomography of the southern Puna plateau; Wiley; Geophysical Journal International; 199; 2; 11-2014; 688-699 0956-540X |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggu296 info:eu-repo/semantics/altIdentifier/url/http://gji.oxfordjournals.org/content/199/2/688.full?keytype=ref&ijkey=C143wck5jj1Ds8u |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Wiley |
publisher.none.fl_str_mv |
Wiley |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1844613967472754688 |
score |
13.070432 |