Luiz1304
- 1
- 0
Hello everyone!
I'm currently working on Probabilistic Seismic Hazard Assessment (PSHA) in Brazil and have a question regarding the appropriate radius for seismic source identification. When calculating Peak Ground Accelerations (PGA) or spectral accelerations for a specific study area, what source-to-site distance should I consider for identifying relevant seismic sources?
I've encountered recommendations for intraplate tectonic regions like Brazil and the Eastern US. Some references suggest a radius of up to 500 km from the study area, with others to 200-300 km based on criteria like mapped faults. However, I've also seen studies using a 1000 km radius.
I think in a 1000 km radius is that even high-magnitude earthquakes might not generate significant ground motion at large distances, given the attenuation observed in Ground Motion Prediction Equations (GMPEs). Some GMPEs, that we use, show low acceleration levels beyond 100 km epicentral distance.
NUREG/CR-6372, Vol. 1, is a great reference i am using, but i would like to know if someone has seen other references or best practices for this kind of study
thank you all!
I'm currently working on Probabilistic Seismic Hazard Assessment (PSHA) in Brazil and have a question regarding the appropriate radius for seismic source identification. When calculating Peak Ground Accelerations (PGA) or spectral accelerations for a specific study area, what source-to-site distance should I consider for identifying relevant seismic sources?
I've encountered recommendations for intraplate tectonic regions like Brazil and the Eastern US. Some references suggest a radius of up to 500 km from the study area, with others to 200-300 km based on criteria like mapped faults. However, I've also seen studies using a 1000 km radius.
I think in a 1000 km radius is that even high-magnitude earthquakes might not generate significant ground motion at large distances, given the attenuation observed in Ground Motion Prediction Equations (GMPEs). Some GMPEs, that we use, show low acceleration levels beyond 100 km epicentral distance.
NUREG/CR-6372, Vol. 1, is a great reference i am using, but i would like to know if someone has seen other references or best practices for this kind of study
thank you all!