Poisson ratio map of Brazil: Data compilation

George Sand Franca, UNB University of Brasilia, Brasilia, Brazil, Marcelo Bianchi, USP University of Sao Paulo, Institute of Astronomy, Geophysics and Atmospheric Sciences, São Paulo, Brazil, Cesar Pavão, UNB University of Brasilia, Asa Norte, Brazil, Lucas P Moreira, Catholic University of Brasilia, Civil Engineering Department, Brasilia, Brazil, Diogo Farrapo Albuquerque, UNB University of Brasilia, Sesimological Observatory, Asa Norte, Brazil, Marcelo Peres Rocha, OBSIS Seismological Observatory of the University of Brasília, Brasilia, Brazil and Giuliano Sant'Anna Marotta, University of Brasilia, Seismological Observatory, Brasília, Brazil
Abstract:
We present a Poisson ration map of Brazil based on a compilation of data published in the literature as well as new measurements. We only used Poisson ration derived from receiver function analyses deep seismic refraction experiments . Our compilation shows that the crust in the stable continental area onshore has an Poisson ratio of 0.24 +- 0.03. The Poisson ratio highest is found along boundary with three provinces; Sao Francisco craton, Tocantins belt and Parana basin. Prelimary results have not clear difference can be observed between low altitude, intracratonic sedimentary basins, NeoProterozoic foldbelts and cratonic aeas. Although sparse in data coverage, we expect the resulting Poisson ratio map to be useful for future studies of isostasy, constraint, dynamic topography, and crustal evolution of the country. 
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