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Title: Seismogenic faulting in the Meruoca granite, NE Brazil, consistent with a local weak fracture zone
Authors: Moura, Ana Catarina de Almeida
Oliveira, Paulo H. S. de
Ferreira, Joaquim Mendes
Bezerra, Francisco Hilário Rego
Fuck, Reinhardt Adolfo
Nascimento, Aderson Farias do
Assunto:: Sismos
Mapeamento geológico
Issue Date: Oct-2014
Publisher: Academia Brasileira de Ciências
Citation: MOURA, Ana Catarina de Almeida et al. Seismogenic faulting in the Meruoca granite, NE Brazil, consistent with a local weak fracture zone. Anais da Academia Brasileira de Ciências, Rio de Janeiro, v. 86, n. 4, p. 1631-1639, dez. 2014. Disponível em: <> Acesso em: 02 jun. 2016. Epub Out. 24, 2014.
Abstract: A sequence of earthquakes occurred in 2008 in the Meruoca granitic pluton, located in the northwestern part of the Borborema Province, NE Brazil. A seismological study defined the seismic activity occurring along the seismically-defined Riacho Fundo fault, a 081° striking, 8 km deep structure. The objective of this study was to analyze the correlation between this seismic activity and geological structures in the Meruoca granite. We carried out geological mapping in the epicentral area, analyzed the mineralogy of fault rocks, and compared the seismically-defined Riacho Fundo fault with geological data. We concluded that the seismically-defined fault coincides with ∼E–W-striking faults observed at outcrop scale and a swarm of Mesozoic basalt dikes. We propose that seismicity reactivated brittle structures in the Meruoca granite. Our study highlights the importance of geological mapping and mineralogical analysis in order to establish the relationships between geological structures and seismicity at a given area.
Licença:: Anais da Academia Brasileira de Ciências - This is an Open Access article distributed under the terms of the Creative Commons(Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Fonte: Acesso em: 2 jun. 2016.
Appears in Collections:IG - Artigos publicados em periódicos

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