Estudo da atividade sísmica em São Caetano-PE em 2007

Neto, Heleno Carlos de Lima; Ferreira, Joaquim Mendes; Nascimento, Aderson F. do; Bezerra, Francisco H.R.

doi:10.1190/sbgf2009-417

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…The swarms of Caruaru (Ferreira et al 2008), Belo Jardim and São Caetano (Lima Neto et al 2009) all have hypocentral depths in the range 3–6 km. Although the maximum magnitude known to have occurred so far near the Pernambuco Lineament was 4.0 m R , the lineament is probably a weak zone and a seismic rupture with lateral extent of a few tens of kilometres cannot be completely ruled out.…”

Section: Discussionmentioning

confidence: 99%

“…2a). The recent activity (2006/2007) in São Caetano, with magnitudes up to 4 m R , was shown by Lima Neto et al (2009) to have occurred on a single SW–NE trending strike‐slip fault, similar to the 2002 Caruaru sequence (Ferreira et al 2008). Interestingly, these two strike‐slip sequences occurred on SW–NE trending lineaments which branch off to the north from the major E–W structure of the Pernambuco Lineament, as seen in Figs 1(b) and 2(a).…”

Section: Focal Mechanism and Regional Stressmentioning

confidence: 96%

“…The grey circle and focal mechanism (1) are the Belo Jardim sequence studied in this paper. The other three focal mechanisms are: 2 = São Caetano 2007 (Lima Neto et al 2009), 3 = Caruaru 1991 (Ferreira et al 1998) and 4 = Caruaru 2002 (Ferreira et al 2008). The open triangle denotes the regional station CAUB near Caruaru.…”

Section: Introductionmentioning

confidence: 99%

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Intraplate earthquake swarm in Belo Jardim, NE Brazil: reactivation of a major Neoproterozoic shear zone (Pernambuco Lineament)

Lopes¹,

Assumpção²,

Nascimento

et al. 2010

Geophysical Journal International

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S U M M A R YIntraplate earthquakes in stable continental areas have been explained basically by reactivation of pre-existing zones of weakness, stress concentration, or both. Zones of weakness are usually identified as sites of the last major orogeny, provinces of recent alkaline intrusions, or stretched crust in ancient rifts. However, it is difficult to identify specific zones of weakness and intraplate fault zones are not always easily correlated with known geological features. Although Northeastern Brazil is one of the most seismically active areas in the country (magnitudes 5 roughly every 5 yr), with hypocentral depths shallower than ∼10 km and seismic zones as long as 30-40 km, no clear relationship with the known surface geology can be usually established with confidence, and a clear identification of zones of weakness has not yet been possible. Here we present the first clear case of seismic activity occurring as reactivation of an old structure in Brazil: the Pernambuco Lineament, a major Neoproterozoic shear zone. The 2004 earthquake swarm of Belo Jardim (magnitudes up to 3.1) and the recurrent activities in the nearby towns of São Caetano and Caruaru (magnitudes up to 4.0 and 3.8), show that the Pernambuco Lineament is a weak zone. A local seismic network showed that the Belo Jardim swarm of 2004 November occurred by normal faulting on a North dipping, E-W oriented fault plane in close agreement with the E-W trending structures within the Pernambuco Lineament. The Belo Jardim activity was concentrated in a 1.5 km (E-W) by 2 km (downdip) fault area, and average depth of 4.5 km. The nearby Caruaru activity occurs as both strike-slip and normal faulting, also consistent with local structures of the Pernambuco Lineament. The focal mechanisms of Belo Jardim, Caruaru and S. Caetano, indicate E-W compressional and N-S extensional principal stresses. The NS extension of this stress field is larger than that predicted by numerical models such as those of Coblentz & Richardson and we propose that additional factors such as flexural stresses from the nearby Sergipe-Alagoas marginal basin could also affect the current stress field in the Pernambuco Lineament.

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Section: Discussionmentioning

confidence: 99%

Section: Focal Mechanism and Regional Stressmentioning

confidence: 96%

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Intraplate earthquake swarm in Belo Jardim, NE Brazil: reactivation of a major Neoproterozoic shear zone (Pernambuco Lineament)

Lopes¹,

Assumpção²,

Nascimento

et al. 2010

Geophysical Journal International

Self Cite

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“…Os únicos casos conhecidos foram os surtos sísmicos em Belo Jardim, São Caetano e Caruaru [29], relacionados com o Lineamento Pernambuco, extensa zona de fraqueza que corta todo o estado de Pernambuco, desde Recife até a divisa com o estado do Piauí. Todavia, efeitos secundários de terremotos, como pequenas fissuras no terreno já foram observadas após os sismos de Pereiro-CE, em 1968 [30], no de João Câmara-RN em 1986 [31] [32] e, possivelmente, no tremor de Tubarão-SC, em 1939 [33].…”

Section: Falhas Sísmicas Brasileirasunclassified

A influência das ações sísmicas nas edificações brasileiras em concreto armado

MIRANDA

2023

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A Deus, pelo dom da vida e por todas as bênçãos derramadas.À minha família que me apoia de todas as formas e compreende minha ausência quando estou afastado do seu convívio, em especial, minha esposa Priscila, meus filhos Giovanna, Guilherme e Gustavo, meus pais Paulo de Souza e Antônia Tavares, meus irmãos Soraia e Leonardo, meu sogro Afonso e minha sogra Maria.A todos os professores que durante minha vida estudantil e acadêmica contribuíram para construção do meu conhecimento.À UFC -Universidade Federal do Ceará, instituição onde me formei e adquiri grau de Mestre em Engenharia Civil -Estruturas.Ao IFCE -Instituto Federal de Educação, Ciência e Tecnologia do Ceará, Campus Juazeiro; instituição da qual sou professor e permitiu meu afastamento para este período de aperfeiçoamento e qualificação.Ao meu orientador, Professor Dr. Humberto Varum, pelos conhecimentos e experiências transmitidos, pela disponibilidade e principalmente pela amizade construída. Agradeço também à Professora Celeste Amorim, esposa do Professor Humberto, vossas filhas e parentes pelo acolhimento dado à minha família.

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