Next Generation Attenuation of Ground Motions (NGA) Project

The “Next Generation of Ground-Motion Attenuation Models” (NGA) project is a multidisciplinary research program coordinated by the Lifelines Program of the Pacific Earthquake Engineering Research Center (PEER), in partnership with the U.S. Geological Survey and the Southern California Earthquake Center.

The objective of the project is to develop new ground-motion prediction relations through a comprehensive and highly interactive research program. Five sets of ground-motion attenuation models were developed by teams working independently but interacting with one another throughout the development process. The development of ground-motion models was supported by other project components, which included (1) developing an updated and expanded PEER database of recorded ground motions, including supporting information on the strong-motion record processing, earthquake sources, travel path, and recording station site conditions; (2) conducting supporting research projects to provide guidance on the selected functional forms of the ground-motion models; and (3) conducting a program of interactions throughout the development process to provide input and reviews from both the scientific research and engineering user communities.

Next Generation Attenuation Models NGA

This page contains the reports and files for the five NGA models developed for the project by Boore-Atkinson, Campbell-Bozorgnia, Chiou-Youngs, Idriss, and Abrahamson-Silva.

NGA Flatfile Used for Development of NGA Models

This flatfile contains an archive of the ground motion records used for the development of the NGA models.

Selected Publications Related to NGA Program

Latest PEER Strong Ground Motion Database

This database is a growing repository of ground motion records that is constantly evolving as new records are added.

Earthquake Spectra Issue about NGA

The February 2008 issue (Volume 24, Issue 1) of the earthquake engineering journal, Earthquake Spectra is dedicated to research papers about the Next Generation Attenuation (NGA) models. This listing shows the manuscripts included in the issue with their abstracts and provides links to the full text versions for those who have access to Earthquake Spectra Online. For more information about Earthquake Spectra and how to gain access to the EQS articles, see the EERI website. Earthquake Spectra is published by the Earthquake Engineering Research Institute.

NGA Project - Meeting Notes, Presentations, Workshops, Documentations

This is a listing of documentations that provide supplemental, supporting information for the NGA modeling procedures and values. It also contains an archive of presentations from workshops conducted during the project.