Seismicity and seismic hazard in the continental margin of southeastern Brazil

Borges, Ricardo Garske; Assumpção, Marcelo; Almeida, Maria Amélia

doi:10.1007/s10950-020-09941-4

Cited by 17 publications

(32 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be observed from Fig. 2 a concentration of epicenters in the Campos Basin, roughly across the continental slope [5].…”

Section: Earthquake Catalogmentioning

confidence: 83%

“…7). Considering that Brazil is in an intraplate setting of low attenuation, [5] adopted [51] and [52] GMPE for the probabilistic hazard assessment in the continental margin of Southeastern Brazil. Additional curves were generated using Scaling Factors (SF) to cover the range of possible seismic attenuation in Brazil (SF = 0.4, 0.75, 1.00, 1.33).…”

Section: Methods 2: Synthetic Accelerogramsmentioning

confidence: 99%

“…For the area of interest at the offshore Campos Basin, the most significant contribution comes from magnitudes 4.5 to 5.1 Mw at distances between 40 and 100 km. Regarding large earthquakes (magnitudes up to 5.7 Mw) it was defined a contribution at distances up to 200 km [5]. There are few events accurately located in the Brazilian earthquake catalog, and the source-to-site distance estimated was at less than about 15 km.…”

Section: Search and Selection Criteriamentioning

confidence: 99%

“…This paper aims to obtain a series of accelerograms representative of the earthquake scenarios in a region located in Southeastern Brazil, specifically in the Campos Basin Continental Slope, offshore of the State of Rio de Janeiro. The dominant earthquake scenarios and mean uniform hazard spectra used in this work for the region of interest were developed by [5]. Three methodologies were employed to obtain spectrum-compatible accelerograms.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Selection of earthquake ground motion accelerograms for the continental margin of Southeastern Brazil

Camelo

Tarazona

Almeida

et al. 2021

DYNA

Self Cite

View full text Add to dashboard Cite

Brazil is in an intraplate area of low to moderate seismicity, this means that few or no records of strong ground motions are available. Part of the site response analysis and seismic design of structures require the use of acceleration time-histories compatible with a specified target response spectrum. This study aims to utilize methodologies based on the use of existing earthquake records from a well-known database and synthetic accelerograms to obtain ground motions representative of the Brazilian Southeast Region, particularly in the offshore Campos Basin. Information from a probabilistic seismic hazard assessment performed in the interest area was employed as input to the methodologies applied in terms of target response spectrum and the dominant earthquake scenarios. Besides, the acceleration time-histories of two relatively recent earthquakes that occurred in the Brazilian Southeast were used to apply one of the approaches to obtain a synthetic spectrum compatible accelerogram.

show abstract

“…It can be observed from Fig. 2 a concentration of epicenters in the Campos Basin, roughly across the continental slope [5].…”

Section: Earthquake Catalogmentioning

confidence: 83%

Section: Methods 2: Synthetic Accelerogramsmentioning

confidence: 99%

Section: Search and Selection Criteriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Selection of earthquake ground motion accelerograms for the continental margin of Southeastern Brazil

Camelo

Tarazona

Almeida

et al. 2021

DYNA

Self Cite

View full text Add to dashboard Cite

show abstract

“…Hazard curves are derived through probabilistic seismic hazard analysis (PSHA) of a specific region or site [16]. While there are a few PSHA studies for Brazil ([2], [10], [11], Souza et al [18], Almeida et al [19], Borges et al [20], Alves [21], Nóbrega et al [22]), studies focusing on fragility functions are currently lacking, as can be observed in the database presented in Silva et al [23], although several were conducted worldwide (Ramamoorthy et al [24], Ellingwood et al [25], Ramamoorthy et al [26], Kappos and Panagopoulos [27], Rajeev and Tesfamariam [28], Jeon et al [29], Amirsaradi et al [30]).…”

Section: Introductionmentioning

confidence: 99%

Seismic reliability assessment of a non-seismic reinforced concrete framed structure designed according to ABNT NBR 6118:2014

Pereira

Cavalcante

Rodrigues

et al. 2022

Rev. IBRACON Estrut. Mater.

View full text Add to dashboard Cite

Due to the paucity of studies regarding the seismic assessment of buildings in Brazil, this study aims to present and discuss a seismic reliability assessment of a reinforced concrete framed structure designed according to the Brazilian standard ABNT NBR 6118:2014 without the consideration of the seismic design requirements of ABNT NBR 15421:2006. Herein, fragility functions are generated through probabilistic seismic demand analysis, and integrated with hazard curves for Northeastern Brazil to generate regional failure probability maps for three limit-states: Immediate Occupancy (IO), Life Safety (LS), and Collapse Prevention (CP). The results indicated that the building performance is adequate for IO; however, for LS and CP, an unacceptable performance is observed.

show abstract

Recalibration of low seismic excitations in Brazil through probabilistic and deterministic analyses: Application for shear buildings structures

Zacchei

Lyra

2022

Structural Concrete

View full text Add to dashboard Cite

Brazil has a low level of seismicity compared to several other regions in the world; however, some significant earthquakes occurred. In this article, four techniques have been used to define new seismic inputs: probabilistic seismic hazard, elastic spectra, synthetic spectra, and artificial accelerograms. To carry out the probabilistic analysis, new seismogenic zones for southeast Brazil established in 2018 have been implemented. Elastic response spectra follow the Brazilian code, whereas the synthetic response spectra have been defined by using attenuation equations. Finally, the artificial accelerograms have been developed using analytical models. Modified Brazilian elastic response spectra by considering the results of the probabilistic seismic hazard analyses are proposed. Artificial accelerations, consistent to the non‐modified and modified elastic response spectra, show that for non‐modified spectra the structural response increases of ~2.50 times. Data for seismogenic zones and specific analytical equations to obtain the probability of non‐exceedance of the spectral accelerations have been adapted for this study. An application for shear buildings was analyzed.

show abstract

Seismicity and seismic hazard in the continental margin of southeastern Brazil

Cited by 17 publications

References 30 publications

Selection of earthquake ground motion accelerograms for the continental margin of Southeastern Brazil

Selection of earthquake ground motion accelerograms for the continental margin of Southeastern Brazil

Seismic reliability assessment of a non-seismic reinforced concrete framed structure designed according to ABNT NBR 6118:2014

Recalibration of low seismic excitations in Brazil through probabilistic and deterministic analyses: Application for shear buildings structures

Contact Info

Product

Resources

About