Resumen

PERARNAU, Marcelo; ALVARADO, Patricia  y  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.

Palabras clave : Crustal structure; Pie de Palo range; Moho; Flat-slab subduction.

        · resumen en Español     · texto en Español     · Español ( pdf )