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Abstract:

We document a new model of crustal structure of the Andean front in Argentina where numerous historic earthquakes destroyed the cities of Mendoza in 1861 (Ms = ∼7) and San Juan in 1944 (Mw = 7.0). The Cerro Salinas anticline is formed above the west directed Cerro Salinas thrust. An east facing monocline with an amplitude of about 2 km folds the Cerro Salinas thrust and overlying Neogene succession. This monocline is formed above a blind crustal thrust in the basement. Its dip of 14° west is inferred from fold geometry. This thick-skinned east directed blind thrust and the thin-skinned west directed Cerro Salinas thrust define a tectonic wedge; the wedge tip occurs at a depth of 5.4 km. Growth of the monocline after ∼8.5 Ma is revealed on multichannel seismic (MSC) profile 31017 (Repsol-YPF). Rates of Cerro Salinas thrust displacement are of the order of 1 mm/yr, whereas vertical uplift of ∼0.45 mm/yr results from the combined displacement on the Cerro Salinas thrust and growth of east facing monocline. The lateral extent of the east directed crustal blind ramp corresponds with the along-strike extent of the Eastern Precordillera. When combined with the low displacement rate, a long earthquake recurrence interval is implied. Smaller magnitude earthquakes, however, indicate that segments of the blind thrust ramps ruptured in historic events. If all the segments of the blind thrust ruptured together the fault area is ∼7000 km2 and could produce a Mw ∼ 7.7 earthquake. The crustal wedge model provides new constraints on the origin and potential size of earthquakes that threaten the densely populated region. Copyright 2007 by the American Geophysical Union.

Registro:

Documento: Artículo
Título:Crustal wedging triggering recent deformation in the Andean thrust front between 31°S and 33°S: Sierras Pampeanas-Precordillera interaction
Autor:Vergés, J.; Ramos, V.A.; Meigs, A.; Cristallini, E.; Bettini, F.H.; Cortés, J.M.
Filiación:Group of Dynamics of the Lithosphere, Institute of Earth Sciences Jaume Almera, Consejo Superior de Investigaciones Científicas, E-08028 Barcelona, Spain
Laboratorio de Tectónica Andina, Departamento de Ciencias Geológicas, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Department of Geosciences, Oregon State University, Corvallis, OR 97331, United States
Repsol-YPF, Av. Pte. Roque Saenz Pena 777, 1035 Buenos Aires, Argentina
Palabras clave:anticline; crustal deformation; crustal structure; displacement; earthquake damage; earthquake magnitude; earthquake trigger; monocline; tectonic wedge; thrust; uplift; Argentina; Mendoza; Precordillera; San Juan [Argentina]; Sierras Pampeanas; South America
Año:2007
Volumen:112
Número:3
DOI: http://dx.doi.org/10.1029/2006JB004287
Título revista:Journal of Geophysical Research: Solid Earth
Título revista abreviado:J. Geophys. Res. B Solid Earth
ISSN:21699313
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699313_v112_n3_p_Verges

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Citas:

---------- APA ----------
Vergés, J., Ramos, V.A., Meigs, A., Cristallini, E., Bettini, F.H. & Cortés, J.M. (2007) . Crustal wedging triggering recent deformation in the Andean thrust front between 31°S and 33°S: Sierras Pampeanas-Precordillera interaction. Journal of Geophysical Research: Solid Earth, 112(3).
http://dx.doi.org/10.1029/2006JB004287
---------- CHICAGO ----------
Vergés, J., Ramos, V.A., Meigs, A., Cristallini, E., Bettini, F.H., Cortés, J.M. "Crustal wedging triggering recent deformation in the Andean thrust front between 31°S and 33°S: Sierras Pampeanas-Precordillera interaction" . Journal of Geophysical Research: Solid Earth 112, no. 3 (2007).
http://dx.doi.org/10.1029/2006JB004287
---------- MLA ----------
Vergés, J., Ramos, V.A., Meigs, A., Cristallini, E., Bettini, F.H., Cortés, J.M. "Crustal wedging triggering recent deformation in the Andean thrust front between 31°S and 33°S: Sierras Pampeanas-Precordillera interaction" . Journal of Geophysical Research: Solid Earth, vol. 112, no. 3, 2007.
http://dx.doi.org/10.1029/2006JB004287
---------- VANCOUVER ----------
Vergés, J., Ramos, V.A., Meigs, A., Cristallini, E., Bettini, F.H., Cortés, J.M. Crustal wedging triggering recent deformation in the Andean thrust front between 31°S and 33°S: Sierras Pampeanas-Precordillera interaction. J. Geophys. Res. B Solid Earth. 2007;112(3).
http://dx.doi.org/10.1029/2006JB004287