Regional electrical structure of the Andean subduction zone in central Chile (35°–36°S) using magnetotellurics
Abstract 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 th...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2017-10-01
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| Series: | Earth, Planets and Space |
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| Online Access: | http://link.springer.com/article/10.1186/s40623-017-0726-z |
| _version_ | 1817984228440145920 |
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| author | Valentina Reyes-Wagner Daniel Díaz Darcy Cordell Martyn Unsworth |
| author_facet | Valentina Reyes-Wagner Daniel Díaz Darcy Cordell Martyn Unsworth |
| author_sort | Valentina Reyes-Wagner |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-04-13T23:42:59Z |
| format | Article |
| id | doaj.art-d28cd6d71c144487aba1c1c344e59faa |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-04-13T23:42:59Z |
| publishDate | 2017-10-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-d28cd6d71c144487aba1c1c344e59faa2022-12-22T02:24:27ZengSpringerOpenEarth, Planets and Space1880-59812017-10-016911910.1186/s40623-017-0726-zRegional electrical structure of the Andean subduction zone in central Chile (35°–36°S) using magnetotelluricsValentina Reyes-Wagner0Daniel Díaz1Darcy Cordell2Martyn Unsworth3Departamento de Geofísica, Universidad de ChileDepartamento de Geofísica, Universidad de ChileDepartment of Physics, University of AlbertaDepartment of Physics, University of AlbertaAbstract 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.http://link.springer.com/article/10.1186/s40623-017-0726-zMagnetotelluricsVolcanismSouthern Volcanic ZoneDeformationSubduction zone |
| spellingShingle | Valentina Reyes-Wagner Daniel Díaz Darcy Cordell Martyn Unsworth Regional electrical structure of the Andean subduction zone in central Chile (35°–36°S) using magnetotellurics Earth, Planets and Space Magnetotellurics Volcanism Southern Volcanic Zone Deformation Subduction zone |
| 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 | Magnetotellurics Volcanism Southern Volcanic Zone Deformation Subduction zone |
| url | http://link.springer.com/article/10.1186/s40623-017-0726-z |
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