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Receiver Function and Magnetoteluric methods were applied in the Paraná basin to image sedimentary and volcanic rock layers. Receiver function had to be adapted to reveal thin and shallow layers, using high frequency (up to 10 Hz) P-waves from subduction zone earthquakes. A Genetic Algorithm was developed to perform a joint inversion of both methods. MT soundings contributes to reduce ambiguities of receiver function inversions. Results of inversions in three seismic stations shows two different seismo-electric models for the basin, called South and North models. In the South model the upper layer is a 1 km thick basalt layer with high velocity and high resistivity. Below the basalt a low velocity and low resistivity zone is interpreted as sedimentary rocks, with two main layers. We found the basementt rocks with typical high resistivity and high velocity at 3.5 km depth. The North model is slightly different, the basalts are 0.6 km thick and basement depth reaches 4.3 km. Alternatively, the basement depth could be the same (∼ 3.6 km) with a second low velocity zone at the bottom of the basin.

Modelamento da bacia do Paraná - Reservatório Capivara - através da inversão conjunta de função do receptor e de sondagem magnetotelúrica