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The study of the crustal structure using receiver function is accomplished with the teleseismic P wave that reaches the base of the crust with a steep angle. Part of the energy the P wave is converted into S when refracting in the Moho descontinuity (Ps wave) and also into multiple reflections. Through the deconvolution of the horizontal with the vertical component, the receiver function is obtained, which presents a large peak for the direct P followed by smaller peaks (Ps waves) of converted waves and reverberation in the crust. The receiver function technique has been used broadly to estimate the crustal structure under broad-band stations. 24 stations in the SE and Central Brazil were analyzed. The multiple reflections are enhanced with the slant stacking which uses the phase as weight. Then we obtain the estimates of the converted phases and have an estimate of the vp/vs ratio beneth each station. In the Paraná Basin, the average thickness is 44 km with a vp/vs ratio increasing towards the axis of the Basin (from 1,71 to 1,77). In the Ribeira belt, the thickness far from the coast is 37 km and ratio = 1,81. Close to the San Francisco Craton, the average thickness is 40 km and ratio = 1,70, and near the coast, it is 34 km and ratio =1,73. The Brası́lia belt is much more heterogeneous, with thicknesses varying from 32 to 42 km and ratios varying from 1,68 to 1,88. For each area the vp/vs ratio and P wave velocity were used to infer the probable composition for the lower crust.

Estrutura da crosta no sudeste e centro-oeste do Brasil, usando função do receptor local: São Paulo