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Abstract:

During the last few hundred years several destructive earthquakes occurred along the eastern margin of the Andean Precordillera, where GPS data reveal a shortening rate of ∼4.5 mm/a. We use fault scarp profiles and age determinations of deformed terraces (T1-T4) to infer coseismic displacements and quantify slip rates for the Peas and Cal thrust faults near Mendoza city. Scarps on the lowest terrace level T1 reveal vertical offsets of 0.8-1.0 m for both faults, which are interpreted as coseismic displacements during the last earthquake. Together with the fault dip these offsets indicate that both faults are capable of producing magnitude MW ∼6.9 earthquakes, which is corroborated by a magnitude M S = 7.0 event on the Cal fault that destroyed Mendoza in 1861. At the Peas thrust fault, terrace T2 has an age of ∼3.3 ka and is offset by ∼1.9 m, whereas the ∼12-ka-old terrace T3 is displaced by ∼11 m. Combined with the fault dip of ∼25 °, the age and offset of terrace T3 define a shortening rate of ∼2.0 mm/a on the Peas fault, i.e., about half of the present-day shortening at the eastern margin of the Precordillera. At the Cal fault, terraces T2 to T 4 have ages of ∼0.8 ka (OSL), ∼3.9 ka (14C), and 12 ka (10Be) and are vertically offset by ∼2.6, ∼3.6, and ∼7.0 m, respectively, which implies that slip on the fault has recently accelerated. Hence, the Cal fault poses a serious seismic hazard to the one million inhabitants of Mendoza. Copyright 2011 by the American Geophysical Union.

Registro:

Documento: Artículo
Título:Coseismic displacements and Holocene slip rates for two active thrust faults at the mountain front of the Andean Precordillera (∼33°S)
Autor:Schmidt, S.; Hetzel, R.; Mingorance, F.; Ramos, V.A.
Filiación:Institut fur Geologie und Palaontologie, Westfalisch Wilhelms-Universitat Munster, Corrensstrase 24, Munster, D-48149, Germany
Instituto de Mecanica Estructural y Riesgo Sismico, Universidad Nacional de Cuyo, Casilla de Correo 40, Correo Central, Mendoza 5500, Argentina
Laboratorio de Tectonica Andina, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, 1428, Argentina
Palabras clave:Earthquakes; Risk assessment; Age determination; Co-seismic displacement; Fault dip; Fault scarp; GPS data; Holocenes; Seismic hazards; Slip rates; Thrust faults; Landforms; coseismic process; displacement; earthquake; earthquake magnitude; GPS; Holocene; mountain region; seismic hazard; slip rate; thrust fault; Precordillera; Pisum sativum
Año:2011
Volumen:30
Número:5
DOI: http://dx.doi.org/10.1029/2011TC002932
Título revista:Tectonics
Título revista abreviado:Tectonics
ISSN:02787407
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02787407_v30_n5_p_Schmidt

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Citas:

---------- APA ----------
Schmidt, S., Hetzel, R., Mingorance, F. & Ramos, V.A. (2011) . Coseismic displacements and Holocene slip rates for two active thrust faults at the mountain front of the Andean Precordillera (∼33°S). Tectonics, 30(5).
http://dx.doi.org/10.1029/2011TC002932
---------- CHICAGO ----------
Schmidt, S., Hetzel, R., Mingorance, F., Ramos, V.A. "Coseismic displacements and Holocene slip rates for two active thrust faults at the mountain front of the Andean Precordillera (∼33°S)" . Tectonics 30, no. 5 (2011).
http://dx.doi.org/10.1029/2011TC002932
---------- MLA ----------
Schmidt, S., Hetzel, R., Mingorance, F., Ramos, V.A. "Coseismic displacements and Holocene slip rates for two active thrust faults at the mountain front of the Andean Precordillera (∼33°S)" . Tectonics, vol. 30, no. 5, 2011.
http://dx.doi.org/10.1029/2011TC002932
---------- VANCOUVER ----------
Schmidt, S., Hetzel, R., Mingorance, F., Ramos, V.A. Coseismic displacements and Holocene slip rates for two active thrust faults at the mountain front of the Andean Precordillera (∼33°S). Tectonics. 2011;30(5).
http://dx.doi.org/10.1029/2011TC002932