T11A-2871
Vp/Vs crustal map of Brazil : Data compilation
Monday, 14 December 2015
Poster Hall (Moscone South)
George Franca1, Magda Oliveira1, Giuliano Sant'Anna Marotta2, Marcelo Peres Rocha2, Diogo Farrapo Albuquerque2 and Marcelo Bianchi3, (1)UNB University of Brasilia, Asa Norte, Brazil, (2)OBSIS Seismological Observatory of the University of Brasília, Brasilia, Brazil, (3)USP University of Sao Paulo, Institute of Astronomy, Geophysics and Atmospheric Sciences, São Paulo, 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.
