Seismic Hazard for Brazilian Northeastern Region

Resumen

The Brazilian territory presents low seismicity, typical of a tectonic intra-plates region. Two regions are exceptions, with non-negligible seismicity: part of the Brazilian Northeast, due to its proximity with the South Atlantic Ridge and part of the Brazilian Northwest (Occidental Amazon), due to its proximity with the Pacific Plate border. The available seismological data and the studies performed for defining the probabilistic distribution functions of seismic magnitudes, in Brazilian Northeast region, are reviewed herein. The considered probabilistic methodology and the analyses performed for the definition of the nominal values of horizontal accelerations are presented. Equal probability design spectra are generated and compared with the ones defined in the Standard.