The Mara Rosa 2010 GT-5 earthquake and its possible relationship with the continental-scale transbrasiliano lineament

Barros, Lucas Vieira; Assumpção, Marcelo; Chimpliganond, Cristiano Naibert; Carvalho, J.; Huelsen, Mônica G. Von; Caixeta, Daniel; França, George Sand; Albuquerque, Diogo Farrapo; Ferreira, Vinicius Martins; Fontenele, Darlan Portela

doi:10.1016/j.jsames.2015.02.002

Cited by 19 publications

(9 citation statements)

References 20 publications

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“…These values can be compared with the spatial distribution of the 53 relocated aftershocks (previously shown in Figure 3.2). (strike 244°, dip 26°) after Barros et al (2014).The cross-section is plotted (NNW-SSE) Stress field -As already mentioned above in connection with Figure 3.8, the P axes of the studied events are in a rough agreement with the expected regional stress field. The calculated focal mechanisms allow us to obtain some quantification of the local stress field.…”

Section: Figure 35 -Comparison Between the Observed (Black) And Syntsupporting

confidence: 66%

“…O mecanismo focal resultante foi validado com a utilização de 12 polaridades de estações regionais (Figura 4.7). O mecanismo focal e a magnitude de momento (Mw) são concordantes com estudos prévios de Barros et al (2014). Na inversão de formas de ondas das réplicas, por se tratar de micro tremores, foi adotada uma abordagem mais criteriosa, utilizando parâmetros de controle de qualidade, tais como: inspeção cuidadosa dos dados de entrada; monitoramento dos parâmetros de inversão e validação dos resultados obtidos.…”

Section: Discussionunclassified

“…Indicador não definido. (Havskov & Ottemöller, 2010 (Havskov & Ottemöller, 2010 (Kikuchi & Kanamori, 1991 Assumpção et al (2014) and from Barros et al (2014) Caproni & Armelin (1990) Barros et al (2014).The cross-section is plotted (NNW-SSE) Este trabalho dá uma contribuição a esses estudos pois mostra que é possível obter, de forma confiável, mecanismos focais de microtremores por inversão de formas de ondas. Foram obtidos os parâmetros de fonte do sismo principal de Mara Rosa (5.0 m b , VI MM, em 08/10/2010) e de onze de suas réplicas registradas por uma rede local de oito estações com instrumentos de período curto (1 Hz -100 Hz) e período longo (30 s -100 Hz), ambos amostrados a 200 sps com distâncias epicentrais menores que 8 km.…”

Section: Figura 14 -Estimativa Da Direção Dos Esforços Na Placa Sul unclassified

“…Apesar dos parâmetros da inversão, VR, DC%, CN não se mostrarem ótimos, o mecanismo focal obtido é concordante com aquele obtido por Barros et al (2014), com as polaridades das fases (P) em todas as estações e os eixos P & T são compatíveis com o regime esforços regional (Assumpção, 1992a).…”

Section: Discussão E Conclusõesunclassified

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Determinação de parâmetros de fonte de eventos locais e regionais por inversão de formas de ondas

Carvalho¹

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Section: Figure 35 -Comparison Between the Observed (Black) And Syntsupporting

confidence: 66%

Section: Discussionunclassified

Section: Figura 14 -Estimativa Da Direção Dos Esforços Na Placa Sul unclassified

Section: Discussão E Conclusõesunclassified

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Determinação de parâmetros de fonte de eventos locais e regionais por inversão de formas de ondas

Carvalho¹

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“…1). Barros et al (2015) used first-motion P-wave polarities and full waveform modelling to study the focal mechanism of an mb 5.0 event in GTSZ occurred in 2010. The GuimaraesPl.…”

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The 2009 earthquake, magnitude mb 4.8, in the Pantanal Wetlands, west-central Brazil

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Facincani

et al. 2016

An. Acad. Bras. Ciênc.

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The main goal of this paper is to characterize the Coxim earthquake occurred in June 15th, 2009 in the Pantanal Basin and to discuss the relationship between its faulting mechanism with the Transbrasiliano Lineament. The earthquake had maximum intensity MM V causing damage in farm houses and was felt in several cities located around, including Campo Grande and Goiânia. The event had an mb 4.8 magnitude and depth was 6 km, i.e., it occurred in the upper crust, within the basement and 5 km below the Cenozoic sedimentary cover. The mechanism, a thrust fault mechanism with lateral motion, was obtained by P-wave first-motion polarities and confirmed by regional waveform modelling. The two nodal planes have orientations (strike/dip) of 300°/55° and 180°/55° and the orientation of the P-axis is approximately NE-SW. The results are similar to the Pantanal earthquake of 1964 with mb 5.4 and NE-SW compressional axis. Both events show that Pantanal Basin is a seismically active area, under compressional stress. The focal mechanism of the 1964 and 2009 events have no nodal plane that could be directly associated with the main SW-NE trending Transbrasiliano system indicating that a direct link of the Transbrasiliano with the seismicity in the Pantanal Basin is improbable.

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Probabilistic seismic hazard analysis for a nuclear power plant site in southeast Brazil

et al. 2018

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A site-specific probabilistic seismic hazard analysis (PSHA) has been performed for the only nuclear power plant site in Brazil, located 130 km southwest of Rio de Janeiro at Angra dos Reis. Logic trees were developed for both the seismic source characterization and ground motion characterization models, in both cases seeking to capture the appreciable ranges of epistemic uncertainty with relatively few branches. This logic-tree structure allowed the hazard calculations to be performed efficiently while obtaining results that reflect the inevitable uncertainty in long-term seismic hazard assessment in this tectonically stable region. An innovative feature of the study is an additional seismic source zone added to capture the potential contributions of characteristics earthquake associated with geological faults in the region surrounding the coastal site.

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The Mara Rosa 2010 GT-5 earthquake and its possible relationship with the continental-scale transbrasiliano lineament

Cited by 19 publications

References 20 publications

Determinação de parâmetros de fonte de eventos locais e regionais por inversão de formas de ondas

Determinação de parâmetros de fonte de eventos locais e regionais por inversão de formas de ondas

The 2009 earthquake, magnitude mb 4.8, in the Pantanal Wetlands, west-central Brazil

Probabilistic seismic hazard analysis for a nuclear power plant site in southeast Brazil

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