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Regional electrical structure of the Andean subduction zone in central Chile (35°–36°S) using magnetotellurics

A profile of broadband magnetotelluric stations was acquired between 2009 and 2016 at 35°–36°S in the Southern Volcanic Zone of the Chilean Andes to image the subduction zone and its relation with the volcanic arc at this latitude. This transect extends from the Coastal Cordillera across the Central...

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Autores principales: Reyes-Wagner, Valentina, Díaz, Daniel, Cordell, Darcy, Unsworth, Martyn
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6961476/
https://www.ncbi.nlm.nih.gov/pubmed/32009833
http://dx.doi.org/10.1186/s40623-017-0726-z
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author Reyes-Wagner, Valentina
Díaz, Daniel
Cordell, Darcy
Unsworth, Martyn
author_facet Reyes-Wagner, Valentina
Díaz, Daniel
Cordell, Darcy
Unsworth, Martyn
author_sort Reyes-Wagner, Valentina
collection PubMed
description A profile of broadband magnetotelluric stations was acquired between 2009 and 2016 at 35°–36°S in the Southern Volcanic Zone of the Chilean Andes to image the subduction zone and its relation with the volcanic arc at this latitude. This transect extends from the Coastal Cordillera across the Central Valley and the volcanic arc of the Principal Cordillera to the Argentine border. Two active volcanic complexes are found along this profile: Tatara-San Pedro is located on the modern volcanic front, and the Laguna del Maule volcanic field is found approximately 30 km to the east. The latter exhibits considerable signs of unrest, such as uplift rates of up to 25 cm/year, and has produced a high concentration of silicic eruptions in the last 25 ky. The data covered the period range from 0.001 to 1000 s. Robust processing techniques were used, including remote reference, and dimensionality was investigated by estimation of geoelectric strike, skew and analysis of the induction arrows. The data were modeled using a 2D inversion algorithm to produce a resistivity model which was consistent with surface geology and seismicity. The final resistivity model shows a generally resistive fore-arc structure, coincident with the tectonic environment, and a wide conductive region from the volcanic front to the east. This suggests a broad region of magmatism throughout the arc, related to three distinct magma bodies, associated with the Tatara-San Pedro and Laguna del Maule volcanic complexes and the Mariposa Geothermal System. [Image: see text] ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s40623-017-0726-z) contains supplementary material, which is available to authorized users.
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spelling pubmed-69614762020-01-29 Regional electrical structure of the Andean subduction zone in central Chile (35°–36°S) using magnetotellurics Reyes-Wagner, Valentina Díaz, Daniel Cordell, Darcy Unsworth, Martyn Earth Planets Space Full Paper A profile of broadband magnetotelluric stations was acquired between 2009 and 2016 at 35°–36°S in the Southern Volcanic Zone of the Chilean Andes to image the subduction zone and its relation with the volcanic arc at this latitude. This transect extends from the Coastal Cordillera across the Central Valley and the volcanic arc of the Principal Cordillera to the Argentine border. Two active volcanic complexes are found along this profile: Tatara-San Pedro is located on the modern volcanic front, and the Laguna del Maule volcanic field is found approximately 30 km to the east. The latter exhibits considerable signs of unrest, such as uplift rates of up to 25 cm/year, and has produced a high concentration of silicic eruptions in the last 25 ky. The data covered the period range from 0.001 to 1000 s. Robust processing techniques were used, including remote reference, and dimensionality was investigated by estimation of geoelectric strike, skew and analysis of the induction arrows. The data were modeled using a 2D inversion algorithm to produce a resistivity model which was consistent with surface geology and seismicity. The final resistivity model shows a generally resistive fore-arc structure, coincident with the tectonic environment, and a wide conductive region from the volcanic front to the east. This suggests a broad region of magmatism throughout the arc, related to three distinct magma bodies, associated with the Tatara-San Pedro and Laguna del Maule volcanic complexes and the Mariposa Geothermal System. [Image: see text] ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s40623-017-0726-z) contains supplementary material, which is available to authorized users. Springer Berlin Heidelberg 2017-10-12 2017 /pmc/articles/PMC6961476/ /pubmed/32009833 http://dx.doi.org/10.1186/s40623-017-0726-z Text en © The Author(s) 2017 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Full Paper
Reyes-Wagner, Valentina
Díaz, Daniel
Cordell, Darcy
Unsworth, Martyn
Regional electrical structure of the Andean subduction zone in central Chile (35°–36°S) using magnetotellurics
title Regional electrical structure of the Andean subduction zone in central Chile (35°–36°S) using magnetotellurics
title_full Regional electrical structure of the Andean subduction zone in central Chile (35°–36°S) using magnetotellurics
title_fullStr Regional electrical structure of the Andean subduction zone in central Chile (35°–36°S) using magnetotellurics
title_full_unstemmed Regional electrical structure of the Andean subduction zone in central Chile (35°–36°S) using magnetotellurics
title_short Regional electrical structure of the Andean subduction zone in central Chile (35°–36°S) using magnetotellurics
title_sort regional electrical structure of the andean subduction zone in central chile (35°–36°s) using magnetotellurics
topic Full Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6961476/
https://www.ncbi.nlm.nih.gov/pubmed/32009833
http://dx.doi.org/10.1186/s40623-017-0726-z
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