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Abstract:

We investigate the seismic properties of modern crustal seismicity in the northwestern Sierras Pampeanas of the Andean retroarc region of Argentina. We modelled the complete regional seismic broadband waveforms of two crustal earthquakes that occurred in the Sierra de Velasco on 28 May 2002 and in the Sierra de Ambato on 7 September 2004. For each earthquake we obtained the seismic moment tensor inversion (SMTI) and tested for its focal depth. Our results indicate mainly thrust focal mechanism solutions of magnitudes Mw 5.8 and 6.2 and focal depths of 10 and 8km, respectively. These results represent the larger seismicity and shallower focal depths in the last 100 years in this region. The SMTI 2002 and 2004 solutions are consistent with previous determinations for crustal seismicity in this region that also used seismic waveform modelling. Taken together, the results for crustal seismicity of magnitudes ≥5.0 in the last 30 years are consistent with an average P-axis horizontally oriented by an azimuth of 125° and T-axis orientation of azimuth 241° and plunge 58°. This modern crustal seismicity and the historical earthquakes are associated with two active reverse faulting systems of opposite vergences bounding the eastern margin of the Sierra de Velasco in the south and the southwestern margin of the Sierra de Ambato in the north. Strain recorded by focal mechanisms of the larger seismicity is very consistent over this region and is in good agreement with neotectonic activity during the last 11,000 years by Costa (2008) and Casa et al. (in press); this shows that the dominant deformation in this part of the Sierras Pampeanas is mainly controlled by contraction. Seismic deformation related to propagation of thrusts and long-lived shear zones of this area permit to disregard previous proposals, which suggested an extensional or sinistral regime for the geomorphic evolution since Pleistocene. © 2010 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling
Autor:Alvarado, P.; Ramos, V.A.
Filiación:Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
Departamento de Geofísica y Astronomía, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Meglioli 1160 S, (5406) Rivadavia, San Juan, Argentina
Laboratorio de Tectónica Andina, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, Buenos Aires, Argentina
Palabras clave:Andean foreland; Crustal earthquakes; Neotectonics; Seismic hazard; Sierras Pampeanas; Andean orogeny; data inversion; deformation; earthquake magnitude; extensional tectonics; faulting; focal mechanism; moment tensor; neotectonics; seismic hazard; seismic property; seismic wave; seismicity; shear zone; Argentina; Sierra de Valasco; Sierras Pampeanas
Año:2011
Volumen:51
Número:4
Página de inicio:205
Página de fin:218
DOI: http://dx.doi.org/10.1016/j.jog.2010.08.002
Título revista:Journal of Geodynamics
Título revista abreviado:J. Geodyn.
ISSN:02643707
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02643707_v51_n4_p205_Alvarado

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Citas:

---------- APA ----------
Alvarado, P. & Ramos, V.A. (2011) . Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling. Journal of Geodynamics, 51(4), 205-218.
http://dx.doi.org/10.1016/j.jog.2010.08.002
---------- CHICAGO ----------
Alvarado, P., Ramos, V.A. "Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling" . Journal of Geodynamics 51, no. 4 (2011) : 205-218.
http://dx.doi.org/10.1016/j.jog.2010.08.002
---------- MLA ----------
Alvarado, P., Ramos, V.A. "Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling" . Journal of Geodynamics, vol. 51, no. 4, 2011, pp. 205-218.
http://dx.doi.org/10.1016/j.jog.2010.08.002
---------- VANCOUVER ----------
Alvarado, P., Ramos, V.A. Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling. J. Geodyn. 2011;51(4):205-218.
http://dx.doi.org/10.1016/j.jog.2010.08.002