Registration open: October 10 - NGA-East Seminar – Ground Motion Hazard for Very Hard Rock

NGA-East Seminar, Oct. 10, 2019

Join the Earthquake Engineering Research Institute and partners for a special seminar on the Next Generation Attenuation Relationships for Central & Eastern North-America (NGA-East).

Register for this seminar here

At this seminar, you’ll gain a deeper understanding of the database, methodology, and models developed by the NGA-East project. You’ll learn about the technical basis and model development of the ground motion models (GMM) for median and standard deviations for Central and Eastern North America. 

The seminar will also summarize the key differences with previously released GMMs for use in probabilistic seismic hazard analyses. The seminar is focused on the ground motion characterization (GMC) model for very hard rock, as for nuclear applications and site-specific studies. We will also touch on the implementation of the NGA-East models in the USGS National Seismic Hazard Maps, and their associated site amplification models.

NGA-East is a multi-disciplinary research project coordinated by the Pacific Earthquake Engineering Research Center at the University of California, Berkeley. The project is jointly sponsored by the U.S. Nuclear Regulatory Commission, the U.S. Department of Energy, the Electric Power Research Institute, and the U.S. Geological Survey.

Who should attend? Nuclear power, geotechnical, lifeline, and structural engineers; seismologists; engineering geologists; urban planners; insurance professionals; risk modelers; and students.


  • Yousef Bozorgnia, Ph.D., P.E., Professor, UCLA
  • Christine Goulet, Ph.D., Executive Director for Applied Science, Southern California Earthquake Center
  • Jonathan Stewart, Ph.D., P.E., Professor, UCLA
  • Nicolas Kuehn, Ph.D., Project Scientist, UCLA
  • Robert Graves, Ph.D., Research Geophysicist, U.S. Geological Survey
  • Linda Al Atik, Ph.D., Linda Alatik Consulting



  • Project overview and database
  • Ground motion model preliminary evaluation: from Candidate to Seed models
  • Quantification of epistemic uncertainty in median ground motions using Sammon's maps
  • Standard deviation development and models
  • Median adjustments for Gulf Coast Region, depth and hanging wall


  • Full model implementation and hazard results
  • Accessing the reports, data, and models
  • Site response amplification models for ergodic studies
  • Q & A


Yousef Bozorgnia, Ph.D., P.E., is a professor at the Department of Civil & Environmental Engineering at UCLA. His expertise includes earthquake engineering and ground motion hazard, with emphasis on multidisciplinary aspects of earthquake science and engineering. He has been the principal coordinator of the interdisciplinary research projects Next Generation Attenuation (NGA), including NGA-East.

Christine Goulet, Ph.D., is the Executive Director for Applied Science at the Southern California Earthquake Center (SCEC). Her work and research interests are in the field of geotechnical earthquake engineering and applied seismology. She acts as the science lead for large-scale collaborative projects involving diverse disciplines related to seismic hazard and risk.

Jonathan Stewart, Ph.D., P.E., is a professor at the Department of Civil & Environmental Engineering at UCLA. His technical expertise is in geotechnical earthquake engineering and engineering seismology, with emphases on soil-structure interaction, ground motion and ground failure hazard characterization, and seismic risk analysis for levees and other distributed infrastructure.

Nicolas Kuehn, Ph.D., is a project scientist at UCLA. His work focuses on earthquake engineering, particularly the development of empirical ground-motion models, their application to probabilistic seismic hazard analysis, and the quantification of uncertainty associated with them. For the NGA-East project, he has worked on the generation of median models and the assessment of their uncertainty distribution.

Robert Graves, Ph.D., is a research geophysicist with the U.S. Geological Survey. His main area of study is the characterization of strong ground shaking due to earthquakes and his research relies heavily on analysis and interpretation of ground motion recordings from past earthquakes, as well as high-performance computer simulation and modeling.

Linda Al Atik, Ph.D., provides consulting and research services in ground motion characterization, site response analysis, and probabilistic seismic hazard analysis for engineering projects located in California, North America, and worldwide. These projects include a wide range of infrastructure facilities, including nuclear power plants and water and gas pipelines.