PEER has just published Report No. 2015/04 titled “NGA-East: Median Ground-Motion Models for the Central and Eastern North America Region” as a new addition to the PEER Report Series.
This report documents recent ground motion models (GMMs) developed as part of the Next Generation Attenuation for Central and Eastern North America (CENA) project (NGA-East). NGA-East is a multi-disciplinary research project coordinated by the Pacific Earthquake Engineering Research Center (PEER) that involves a large number of participating junior and senior researchers, practitioners, and end-users. Various organizations have provided technical input to the project from academia, industry, and government agencies. The objective of NGA-East is to develop a new ground motion characterization (GMC) model for the Central and Eastern North America (CENA) region. The tectonic region of interest reaches across into Canada; thus, the term CENA instead of CEUS is used. The GMC consists in a set of new models (GMMs, a.k.a. GMPEs) for median, ground motions a set of standard deviation models, and their associated weights in the logic-trees, for use in probabilistic seismic hazard analyses (PSHA).
The current report documents the development of new median candidate GMMs. Models for standard deviations of ground motions are developed through a separate set of tasks within NGA-East and are published separately.
The GMMs have been developed using various tasks previously completed in NGA-East, notably the path regionalization, finite-fault simulations, and database development tasks. This report consists of eleven chapters. Each chapter has its own GMM developer team and may include multiple new GMMs. In all, a total of 20 GMMs are described in this report, covering a range of alternative approaches for modeling ground motions, building on empirical relations for CENA and WNA, using recorded ground motions and collected intensity data, and incorporating point-source and finite-fault simulations.