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dc.contributor.author
Rockwell, Thomas K.
dc.contributor.author
Costa, Carlos H.
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Meigs, Andrew J.
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Ragona, Daniel
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Owen, Lewis A.
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Murari, Madhav Krishna
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Masana, Eulalia
dc.contributor.author
Richard, Andrés David
dc.date.available
2023-11-14T14:04:54Z
dc.date.issued
2022-12
dc.identifier.citation
Rockwell, Thomas K.; Costa, Carlos H.; Meigs, Andrew J.; Ragona, Daniel; Owen, Lewis A.; et al.; Paleoseismology of the Marquesado-La Rinconada thrust system, Eastern Precordillera of Argentina; Frontiers Media; Frontiers in Earth Science; 10; 12-2022; 1-23
dc.identifier.issn
2296-6463
dc.identifier.uri
http://hdl.handle.net/11336/218035
dc.description.abstract
Excavated trenches at two sites across the Marquesado–La Rinconada fault system along the eastern Precordilleran front south of San Juan, Argentina, reveal the earthquake history of this rapidly urbanizing region. Interpretation of earthquakes is based on both the generation of colluvial wedges and upward fault terminations, as well as folding events in fine-grained alluvium ponded behind upslope-facing fault scarps. The ages of the past five interpreted earthquakes at the Loma Negra site are E1 at 2.8 ± 2.8 ka, E2 at 7.1 ± 1.5 ka, E3 at 9.6 ± 1.3 ka, E4 at 14.4 ± 2.1 ka, and E5 at 17.2 ± 3.1 ka. At the Jejenes sites, we documented event ages of 2.7 ± 0.1 ka, 3.9 ± 0.6 ka, 5.9 ± 1.3 ka, and 11.4 ± 4 ka. These results indicate that the recurrence interval along the Marquesado–La Rinconada fault zone averages several thousand years. The inferred displacements at the Jejenes site are about 1.1 m for E1, E3, and E4 and 2.1 m for event E2, whereas the displacements at Loma Negra averaged about 1 m, but the most recent event displays less slip. Notably, the older events seem to have been larger and emergent, whereas the youngest event appears to have been smaller and blind in the ponded sediment; this may partially explain the poor expression of classic colluvial wedges associated with some events. Despite the fact that active surface faulting has an uncertain relationship with the primary seismic sources at depth in the crust, past and future events of Mw ∼7.5 are consistent with the length scale of active deformation, the ∼1–2 m slip per event scale of these ruptures, and the size of historical earthquakes.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Frontiers Media
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ANDES
dc.subject
ARGENTINA
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EASTERN PRECORDILLERA
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MARQUESADO–LA RINCONADA FAULT
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PALEOSEISMOLOGY
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SAN JUAN EARTHQUAKE HAZARD
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Geología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Paleoseismology of the Marquesado-La Rinconada thrust system, Eastern Precordillera of Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-11-13T10:41:52Z
dc.journal.volume
10
dc.journal.pagination
1-23
dc.journal.pais
Suiza
dc.description.fil
Fil: Rockwell, Thomas K.. San Diego State University; Estados Unidos
dc.description.fil
Fil: Costa, Carlos H.. Universidad Nacional de San Luis; Argentina
dc.description.fil
Fil: Meigs, Andrew J.. State University of Oregon; Estados Unidos
dc.description.fil
Fil: Ragona, Daniel. San Diego State University; Estados Unidos
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Fil: Owen, Lewis A.. North Carolina State University; Estados Unidos
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Fil: Murari, Madhav Krishna. North Carolina State University; Estados Unidos
dc.description.fil
Fil: Masana, Eulalia. Universidad de Barcelona; España
dc.description.fil
Fil: Richard, Andrés David. Universidad Nacional de San Luis; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis; Argentina
dc.journal.title
Frontiers in Earth Science
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3389/feart.2022.1032357
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