Seismotectonic implications of the South Chile ridge subduction beneath the Patagonian Andes
Abstract The South Chile ridge (SCR) intersects the Patagonian trench around 46°09′S, forming the triple junction among the Antarctic, Nazca, and South America plates. Subduction of the SCR since ~18 Ma produced the opening of a slab window beneath Patagonia and a noticeable magmatic gap in the cord...
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crwiley:10.1111/ter.12521 2023-12-03T10:12:51+01:00 Seismotectonic implications of the South Chile ridge subduction beneath the Patagonian Andes Suárez, Rodrigo Sue, Christian Ghiglione, Matías Guillaume, Benjamin Ramos, Miguel Martinod, Joseph Barberón, Vanesa 2021 http://dx.doi.org/10.1111/ter.12521 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ter.12521 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ter.12521 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Terra Nova volume 33, issue 4, page 364-374 ISSN 0954-4879 1365-3121 Geology journal-article 2021 crwiley https://doi.org/10.1111/ter.12521 2023-11-09T13:56:29Z Abstract The South Chile ridge (SCR) intersects the Patagonian trench around 46°09′S, forming the triple junction among the Antarctic, Nazca, and South America plates. Subduction of the SCR since ~18 Ma produced the opening of a slab window beneath Patagonia and a noticeable magmatic gap in the cordillera, profuse volcanism and topographic uplift in the retroarc. To study seismicity distribution and present‐day stress resulting from this particular framework, we analyse databases of seismic events and earthquake focal mechanisms. Our study finds that clusters of intraplate crustal seismic events are disrupted by a ~450–470 km seismicity gap above the slab window. Calculated stress tensors depict a strike‐slip tectonic regime north of the triple junction, and ~W‐E compression to the south of the seismic gap. We propose that the seismotectonic behaviour of the upper plate is disturbed at the first order by the trench‐ridge intersection, leading to a heterogeneous stress field. Article in Journal/Newspaper Antarc* Antarctic Wiley Online Library (via Crossref) Antarctic Patagonia The Antarctic Terra Nova 33 4 364 374 |
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Wiley Online Library (via Crossref) |
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English |
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Geology |
spellingShingle |
Geology Suárez, Rodrigo Sue, Christian Ghiglione, Matías Guillaume, Benjamin Ramos, Miguel Martinod, Joseph Barberón, Vanesa Seismotectonic implications of the South Chile ridge subduction beneath the Patagonian Andes |
topic_facet |
Geology |
description |
Abstract The South Chile ridge (SCR) intersects the Patagonian trench around 46°09′S, forming the triple junction among the Antarctic, Nazca, and South America plates. Subduction of the SCR since ~18 Ma produced the opening of a slab window beneath Patagonia and a noticeable magmatic gap in the cordillera, profuse volcanism and topographic uplift in the retroarc. To study seismicity distribution and present‐day stress resulting from this particular framework, we analyse databases of seismic events and earthquake focal mechanisms. Our study finds that clusters of intraplate crustal seismic events are disrupted by a ~450–470 km seismicity gap above the slab window. Calculated stress tensors depict a strike‐slip tectonic regime north of the triple junction, and ~W‐E compression to the south of the seismic gap. We propose that the seismotectonic behaviour of the upper plate is disturbed at the first order by the trench‐ridge intersection, leading to a heterogeneous stress field. |
format |
Article in Journal/Newspaper |
author |
Suárez, Rodrigo Sue, Christian Ghiglione, Matías Guillaume, Benjamin Ramos, Miguel Martinod, Joseph Barberón, Vanesa |
author_facet |
Suárez, Rodrigo Sue, Christian Ghiglione, Matías Guillaume, Benjamin Ramos, Miguel Martinod, Joseph Barberón, Vanesa |
author_sort |
Suárez, Rodrigo |
title |
Seismotectonic implications of the South Chile ridge subduction beneath the Patagonian Andes |
title_short |
Seismotectonic implications of the South Chile ridge subduction beneath the Patagonian Andes |
title_full |
Seismotectonic implications of the South Chile ridge subduction beneath the Patagonian Andes |
title_fullStr |
Seismotectonic implications of the South Chile ridge subduction beneath the Patagonian Andes |
title_full_unstemmed |
Seismotectonic implications of the South Chile ridge subduction beneath the Patagonian Andes |
title_sort |
seismotectonic implications of the south chile ridge subduction beneath the patagonian andes |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/ter.12521 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ter.12521 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ter.12521 |
geographic |
Antarctic Patagonia The Antarctic |
geographic_facet |
Antarctic Patagonia The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Terra Nova volume 33, issue 4, page 364-374 ISSN 0954-4879 1365-3121 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/ter.12521 |
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Terra Nova |
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33 |
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4 |
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364 |
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374 |
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1784259487180259328 |