Earthquake sequences in the southern block of the Pernambuco Lineament, NE Brazil: Stress field and seismotectonic implications

Neto, H. C. Lima; Ferreira, Joaquim Mendes; Bezerra, Francisco H.R.; Assumpção, Marcelo; Nascimento, Aderson F. do; Sousa, Maria O.L.; Menezes, E. A.

doi:10.1016/j.tecto.2014.07.010

Cited by 20 publications

(4 citation statements)

References 34 publications

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“…Likewise, tectonic inversion in North Sea basins have also been associated with an interaction between far‐field stresses from the opening of the Norwegian Sea, active ridge push from the Mohns Ridge and Iceland, and Alpine orogeny (Omosanya, 2020). The compressive stress in Brazilian intraplate area is also supported by focal mechanisms of current earthquakes, which indicate E‐W‐trending compression responsible for the brittle reactivations of Precambrian ductile shear zones (Assumpção, Dias, Zevallos, & Naliboff, 2016; Lima Neto et al., 2014). If Marques et al.…”

Section: Discussionmentioning

confidence: 93%

“…The tectonic inversion caused by far-field stresses is also recorded in African basins (e.g., Guiraud & Bosworth, 1997;Hudec & Jackson, 2002). Likewise, tectonic inversion in North Sea basins have also been associated with an interaction between far-field stresses from the opening of the Norwegian Sea, active ridge push from the Mohns Ridge and Iceland, and Alpine orogeny (Omosanya, 2020 by focal mechanisms of current earthquakes, which indicate E-W-trending compression responsible for the brittle reactivations of Precambrian ductile shear zones (Assumpção, Dias, Zevallos, & Naliboff, 2016;Lima Neto et al, 2014). If Marques et al (2014) and Nogueira et al (2015) are correct in their interpretation that inversion of the intracontinental basins in NE Brazil during the post-rift phase is a result of the combined pushes of the Mid-Atlantic Ridge (towards the W) and the Andes (towards the E), then the possible timing of tectonic inversion in the RPB should be directly related to the three periods of increased topography in the Andes (Cobbold et al, 2007;Coblentz & Richardson, 1996): the Peruvian (80-65 Ma), the Incaic (45-28 Ma) and the Quechuan (22-0 Ma) phases.…”

Section: Far-field Stresses and Age Of Tectonic Inversion In The Rpbmentioning

confidence: 92%

“…by focal mechanisms of current earthquakes, which indicate E-W-trending compression responsible for the brittle reactivations of Precambrian ductile shear zones (Assumpção, Dias, Zevallos, & Naliboff, 2016;Lima Neto et al, 2014). If Marques et al (2014) and Nogueira et al (2015) are correct in their interpretation that inversion of the intracontinental basins in NE Brazil during the post-rift phase is a result of the combined pushes of the Mid-Atlantic Ridge (towards the W) and the Andes (towards the E), then the possible timing of tectonic inversion in the RPB should be directly related to the three periods of increased topography in the Andes (Cobbold et al, 2007;Coblentz & Richardson, 1996): the Peruvian (80-65 Ma), the Incaic (45-28 Ma) and the Quechuan (22-0 Ma) phases.…”

Section: Far-field Stresses and Age Of Tectonic Inversion In The Rpbmentioning

confidence: 99%

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Tectonic inversion assessed by integration of geological and geophysical data: The intracontinental Rio do Peixe Basin, NE Brazil

et al. 2020

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Common basin models assume that the post‐rift tectonic evolution of most basins is usually associated with tectonic quiescence. However, tectonic inversion during the post‐rift phase has been proposed for several sedimentary basins worldwide, but how and why it happens is still a matter of debate, especially in intracontinental settings where the lithosphere is old and thick. Here, we use geological and geophysical data from the Rio do Peixe Basin in NE Brazil to show evidence that intracontinental sedimentary basins can be tectonically inverted by far‐field compressive stresses acting on pre‐existing weakness zones of lithospheric‐scale where stresses can concentrate and inversion can occur. Geomorphological and field data combined with seismic reflection, gravimetric and borehole data show that: (a) inversion occurred along two main Precambrian lithospheric‐scale shear zones, the Patos (E‐W trending) and Portalegre (NE‐SW trending), which had already been reactivated as basin‐bounding faults during the earlier rift stage; (b) post‐rift reactivation affected (mostly) the original master normal faults with the largest rift displacements, and locally produced new reverse faults; (c) during contraction, deformation was partitioned between fault reactivation and buckling of the incompetent sediment pushed against the hard basement; (d) all these signs of inversion have been observed in the field and can be demonstrated on seismic reflection profiles; and (e) combined gravimetric and seismic data show that the main structures of the basin were followed by an inversion. These data are consistent with the operation of WSW‐ENE horizontal maximum compressive stress as a result of combined pushes of the Mid‐Atlantic Ridge (towards the W) and the Andes (towards the E), responsible for the post‐rift oblique inversion of normal faults inherited from the rift phase and formed with vertical maximum compressive stress.

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Section: Discussionmentioning

confidence: 93%

Section: Far-field Stresses and Age Of Tectonic Inversion In The Rpbmentioning

confidence: 92%

Section: Far-field Stresses and Age Of Tectonic Inversion In The Rpbmentioning

confidence: 99%

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Tectonic inversion assessed by integration of geological and geophysical data: The intracontinental Rio do Peixe Basin, NE Brazil

et al. 2020

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“…Apesar disso, muito tem sido feito no Brasil , em particular na Província Borborema (por exemplo Ferreira et al, 1998;Lima Neto et al, 2014;Oliveira et al, 2015), que é a região de maior atividade sísmica no país. Particular destaque é dado aos sismos na borda da Bacia Potiguar, abrangendo o Rio Grande do Norte e o leste do Ceará, geralmente se apresentando na forma de sequências e podendo durar de meses a alguns anos, com alguns tremores de magnitude acima de 5,0 m R , que causam danos em edificações e pânico e fuga das populações (Ferreira e Assumpção, 1983;Ferreira et al, 1998).…”

Section: Introductionunclassified

Sismicidade intraplaca em Pedra Preta (RN) no período de 2013 a 2014

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Ferreira

Neto

et al. 2017

Geol. USP. Sér. Cient.

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ResumoA atividade sísmica em Pedra Preta (RN), localizada no Nordeste do Brasil, região de maior sismicidade intraplaca do país, teve início em dezembro de 2010. Antes disso, não havia registro de sismos na área. Durante o ano de 2013 e início de 2014, a rede sismográfica de Pedra Preta registou 273 sismos locais em 3 ou mais estações. Desses eventos foram selecionados os 50 com melhor leitura dos tempos de chegada das ondas P e S, sendo determinado o modelo de velocidades (V p /V s = 1,72 e V p = 5,90 km/s) e calculados os hipocentros, com o programa HYPO71. Para a determinação do mecanismo focal composto foi realizada uma nova seleção de sismos obedecendo critérios mais restritos para os hipocentros (epicentros localizados dentro da rede com resíduo médio de tempo de chegada ≤ 0,01 s, número de observações ≥ 10, erro médio na horizontal < 0,1 km, erro médio na vertical < 0,1 km), tendo sido selecionados por esses critérios 24 eventos. Os hipocentros desses sismos mostram que a falha sismogênica tem aproximadamente 3 km de extensão, com sismos de 2,3 a 5,8 km de profundidade. Os parâmetros da falha sismogênica foram obtidos pela combinação do método dos mínimos quadrados e do programa FPFIT (strike = 254º, dip = 67º e rake = -66º), caracterizando uma falha normal. Os epicentros e o mecanismo focal foram utilizados para verificar se havia ou não possível correlação com feições geológicas mapeadas na área. A conclusão é que não existem feições geológicas mapeadas que possam estar relacionadas diretamente com a atividade sísmica estudada.Palavras-chave: Atividade sísmica; Determinação hipocentral; Mecanismo focal; Falhas sismogênicas; Sismotectônica. AbstractThe seismic activity in Pedra Preta (RN), Northeast of Brazil, region of main intraplate seismicity of the country, began in December 2010. Before that year, there was no record of earthquakes in this area. During 2013 and early 2014, the seismographic network deployed in Pedra Preta registered 273 local earthquakes in 3 or more stations. Of these, 50 events with the best readings of the arrival times of the P and S waves were selected to determine velocity model (V p /V s = 1.72 and V p = 5.90 km/s) and their hypocenters were calculated, with HYPO71 software. For the determination of the composed focal mechanism, it was realized a new selection with earthquakes obeying more stringent criteria for the hypocenters (epicenters located within the network with mean arrival-time residue ≤ 0.01 s, number of observations ≥ 10, mean horizontal error < 0.1 km, mean vertical error < 0.1 km), having been selected 24 events by these criteria. The hypocenters of earthquakes show that the seismogenic fault is about 3 km long, with earthquakes between 2.3 and 5.8 km deep. The parameters of seismogenic fault were obtained by combining the method of least squares and FPFIT software (strike = 254º, dip = 67º and the rake = -66º), indicating a normal fault. The hypocenters and focal mechanism were used to verify if there was possible correlation with geological features mapped i...

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The Paradigm of Stable Intraplate Regions and Neotectonics in Northeastern Brazil

Maia

Bezerra

2019

Structural Geomorphology in Northeastern Brazil

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Earthquake sequences in the southern block of the Pernambuco Lineament, NE Brazil: Stress field and seismotectonic implications

Cited by 20 publications

References 34 publications

Tectonic inversion assessed by integration of geological and geophysical data: The intracontinental Rio do Peixe Basin, NE Brazil

Tectonic inversion assessed by integration of geological and geophysical data: The intracontinental Rio do Peixe Basin, NE Brazil

Sismicidade intraplaca em Pedra Preta (RN) no período de 2013 a 2014

The Paradigm of Stable Intraplate Regions and Neotectonics in Northeastern Brazil

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