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Abstract:

Only few (six) focal mechanism, in CMT Catalog, have been so far known for intraplate shallow events in the Andean chain close to Chile–Argentina state border at latitudes ∼35° S. We add two more mechanisms, depths and moment magnitudes by carefully analyzing full waveforms of weak events recorded by broad-band stations of the Chile Argentina Geophysical Experiment (southern profile). The moment magnitudes of both events (Mw = 3.6 and 3.7) are lower than the duration magnitudes (Md = 4.0 and 4.29) reported by NEIC. The source depth, constrained by waveforms for one of the studied events (5.5–8.5 km) seems to be considerably shallower than the hypocenter depth located by means of arrival times (∼20 km). The waveform analysis was complemented by first-motion polarities which resulted in an uncertainty assessment of the focal mechanism. Event 1 (2001-11-03) has a strike-slip mechanism with a small normal component and almost vertical nodal planes in the north-south and east-west directions. The north-south nodal plane could be related to the Calabozos faults system. Event 2 (2002-02-16) has a strike-slip mechanism with a small thrust component. The latter event (its subhorizontal nodal plane) could be associated with the El Diablo-El Fierro fault system. Dextral strike-slip solutions are consistent with recent studies in the area. © 2015 Elsevier Ltd

Registro:

Documento: Artículo
Título:Waveform inversion and focal mechanisms of two weak earthquakes in Cordillera Principal (Argentina) between 35° and 35.5° S
Autor:Villegas A., R.J.; Zahradník, J.; Nacif, S.; Spagnotto, S.; Winocur, D.; Leiva, M.F.
Filiación:Consejo Nacional de Investigaciones Científicas y Técnicas, Conicet, Argentina
Centro de Investigaciones en Ciencias de la Tierra, Universidad Nacional de Córdoba, Av. Vélez Sarsfield, Córdoba, 1611, Argentina
Charles University in Prague, Faculty of Mathematics and Physics, V Holesovickach 2, Prague, 180 00, Czech Republic
Instituto Geofísico Sismológico F. Volponi, Universidad Nacional de San Juan, Ruta 12, Km 17, Marquesado, Rivadavia, San Juan, Argentina
Departamento de Física, Universidad Nacional de San Luis, Ejército de los Andes 950, San Luis, 5700, Argentina
Laboratorio de Tectónica Andina, Instituto de Estudios Andinos (UBA-CONICET), Argentina
Palabras clave:Andean chain; Cordillera Principal; CSPS code; ISOLA; Moment tensor; Waveform inversion; Weak earthquakes; arrival time; border region; earthquake catalogue; earthquake hypocenter; earthquake magnitude; earthquake mechanism; focal mechanism; intraplate process; moment tensor; strike-slip fault; tectonic setting; Argentina; Chile; Cordillera Principal
Año:2016
Volumen:71
Página de inicio:359
Página de fin:369
DOI: http://dx.doi.org/10.1016/j.jsames.2015.12.001
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v71_n_p359_VillegasA

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Citas:

---------- APA ----------
Villegas A., R.J., Zahradník, J., Nacif, S., Spagnotto, S., Winocur, D. & Leiva, M.F. (2016) . Waveform inversion and focal mechanisms of two weak earthquakes in Cordillera Principal (Argentina) between 35° and 35.5° S. Journal of South American Earth Sciences, 71, 359-369.
http://dx.doi.org/10.1016/j.jsames.2015.12.001
---------- CHICAGO ----------
Villegas A., R.J., Zahradník, J., Nacif, S., Spagnotto, S., Winocur, D., Leiva, M.F. "Waveform inversion and focal mechanisms of two weak earthquakes in Cordillera Principal (Argentina) between 35° and 35.5° S" . Journal of South American Earth Sciences 71 (2016) : 359-369.
http://dx.doi.org/10.1016/j.jsames.2015.12.001
---------- MLA ----------
Villegas A., R.J., Zahradník, J., Nacif, S., Spagnotto, S., Winocur, D., Leiva, M.F. "Waveform inversion and focal mechanisms of two weak earthquakes in Cordillera Principal (Argentina) between 35° and 35.5° S" . Journal of South American Earth Sciences, vol. 71, 2016, pp. 359-369.
http://dx.doi.org/10.1016/j.jsames.2015.12.001
---------- VANCOUVER ----------
Villegas A., R.J., Zahradník, J., Nacif, S., Spagnotto, S., Winocur, D., Leiva, M.F. Waveform inversion and focal mechanisms of two weak earthquakes in Cordillera Principal (Argentina) between 35° and 35.5° S. J. South Am. Earth Sci. 2016;71:359-369.
http://dx.doi.org/10.1016/j.jsames.2015.12.001