PEER NGA-East Overview: Development of a Ground Motion Characterization Model and Ground Motion Prediction Equations for Central and Eastern North America
PEER NGA-East Overview: Development of a Ground Motion Characterization Model and Ground Motion Prediction Equations for Central and Eastern North America
French Title: PEER NGA-East: Développement d’un modèle de mouvement de sol pour le Centre et l’Est de l’Amérique du Nord incluant de nouvelles équations de prédiction du mouvement du sol (lois d’atténuation)
Previously Published Material: Partial findings of this study has been previously presented in NGA-East workshops (Berkeley, CA), which were made public and accessible online. Other progress reports on NGA-East have been presented at various meetings, such as SSA meetings and hazard workshops hosted by the USGS (multiple US locations).
Abstract ID#: 35656
English Abstract:
The Next Generation Attenuation project for Central and Eastern North America (NGA-East) is a large multi-disciplinary project tasked to develop a new ground motion characterization (GMC) model for the Central and Eastern North-America (CENA) region. The GMC model consists in a set of ground motion prediction equations (GMPEs) for median and standard deviation of ground motions and their associated weights, combined into logic-trees for use in probabilistic seismic hazard analyses (PSHA). NGA-East faced many technical challenges, most of them related to the relatively small number of earthquake recordings available for CENA. To address this shortcoming, the project relied on ground motion simulations to supplement the available data. Other important scientific issues were addressed through targeted research projects on topics such as the regionalization of seismic source, path and attenuation of motions, the treatment of variability and uncertainties and on the evaluation of site effects. Seven working groups were formed to cover the complexity and breadth of topics in the NGA-East project, each focused on a specific technical area. Through its multi-year span, NGA-East developed a comprehensive database of ground motion records, numerous interim products for the quantification of ground motions in CENA as well as new GMPEs. An overview of the project is presented, followed by highlights on latest progress, notably on the development of new GMPEs and their integration into the GMC model.