Estudo do manto superior no Brasil Central utilizando Tomografia Sísmica de tempo de percurso

Azevedo, Paulo Araújo de; Rocha, Marcelo Peres; Soares, Joelson Lima; Fuck, Reinhardt A.

doi:10.22564/5simbgf2012.158

Cited by 1 publication

(2 citation statements)

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“…This method was recently used by Costa et al. (2020) in Brazil to study the Amazonian Craton, providing tomographic images with higher resolution than the works done in the region with ray theory (Azevedo, 2017), allowing the discussion of the compartmentation of that craton and its metallogenic implications.…”

Section: Introductionmentioning

confidence: 99%

“…MFT is based on the theory developed by Dahlen et al (2000), in which the wave's frequency content, healing and diffraction effects are taken in consideration to get the travel-time measures, resulting in frequency dependent Fréchet Kernels, also called Banana-Doughnut Kernels (Marquering et al, 1999). This method was recently used by Costa et al (2020) in Brazil to study the Amazonian Craton, providing tomographic images with higher resolution than the works done in the region with ray theory (Azevedo, 2017), allowing the discussion of the compartmentation of that craton and its metallogenic implications.…”

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confidence: 99%

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Lithospheric Architecture of the Paranapanema Block and Adjacent Nuclei Using Multiple‐Frequency P‐Wave Seismic Tomography

et al. 2021

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We present a new P‐wave seismic tomographic model for the region of the Paraná Basin and surroundings using a multiple‐frequency approach, providing better resolution than previous regional studies. We processed a total of 62,692 cross‐correlation delays for P, PKIKP, PcP, and PP phases distributed among 1,081 events using six different central frequencies (0.03, 0.06, 0.13, 0.25, 0.50, and 1 Hz). We merged our data with a previous multiple‐frequency study of the Amazonian Craton to cover regions outside of the study area, obtaining a total of 75,187 cross‐correlation delays. The data used are from the stations of the Brazilian Seismographic Network, and mainly from a temporary network (XC network) installed exclusively to study the region. The basement of the Paraná Basin is represented as a NE‐SW trending P‐wave high‐velocity anomaly, extending from the northern limit of the basin to the southwestern border of Brazil, consistent with previous reports. The limit between this block and the São Francisco Craton is characterized by decreased amplitude of the P‐wave high‐velocity anomaly. Synthetic tests show that a narrow boundary between these two blocks displays the same behavior. At the southeastern portion of this anomaly, decreasing amplitude is consistent with the limit of the Luiz Alves Craton, which was also corroborated by synthetic tests. The northern portion of the Rio Apa Block agrees with a previous tomographic model, confirming that it does not extend under the Pantanal Basin, however, in our model this structure does not extend as far south.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%