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Revista de la Asociación Geológica Argentina
versão impressa ISSN 0004-4822
Resumo
PERARNAU, Marcelo; ALVARADO, Patricia e SAEZ, Mauro. Estimation of the seismic velocity crustal structure in the southwest region of the Sierra de Pie de Palo southwest San Juan. Rev. Asoc. Geol. Argent. [online]. 2010, vol.67, n.4, pp.473-480. ISSN 0004-4822.
In this paper receiver function results beneath the seismic station Coronel Fontana (31,605°S and 68,238°W), in the western Sierras Pampeanas are shown. These results provide evidence for two intracrustal discontinuities at depths of 13 km and 28 km approximately and a deeper discontinuity near 47 km depth, which correlates with the Moho. Overall the ratio between the seismic velocities of P and S waves (Vp/Vs) for these discontinuities are high. In particular, the region between 13 and 28 km depth shows the higher values of Vp/Vs, which is consistent with a higher degree of fracturing and faulting. The results also indicate a denser composition of the lower crust.
Palavras-chave : Crustal structure; Pie de Palo range; Moho; Flat-slab subduction.