Group A, Poster #171, Ground Motions (GM)

Overview of the NGA-West3 Ground Motion Database

Jonathan P. Stewart, Tristan E. Buckreis, Rashid R. Shams, Shako Mohammed, Li Meibai, Tadahiro Kishida, Giovanni Lanzano, Lucia Luzi, Paolo Zimmaro, Brendon A. Bradley, Jyun-Yan Huang, Chukwuebuka C. Nweke, Scott J. Brandenberg, Jennifer L. Donahue, & Yousef Bozorgnia
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Poster Presentation

2024 SCEC Annual Meeting, Poster #171, SCEC Contribution #13977 VIEW PDF
The Next Generation Attenuation (NGA)-West3 project database builds upon that of NGA-West2 for shallow crustal earthquakes in active tectonic regimes to provide a robust dataset to develop the next iteration of NGA ground motion models (GMMs). Collaborators from Italy, Japan, the Middle East, New Zealand, Taiwan, and the United States, amongst others, have collaborated to develop consistently processed data with uniform metadata from the respective regions, with data for other regions drawn from literature (Greece, Türkiye). Over 80,000 three-component ground motions from 629 events with magnitudes generally greater than 4.0 across the Western United States (mostly in California) have been n...ewly added and the total database size is approximately 116,000 ground motions. This number is expected to surpass 150,000 by the completion of the project in 2025 through the addition of other international datasets.

NGA-West3 is the largest of the NGA databases, however the level of detail that goes into data processing and metadata curation is consistent with previous NGA projects. Using a version of gmprocess specifically developed to facilitate minimization of baseline drift and a customized GUI to check adequacy of corner frequency selection (Thompson et al. 2024; Ramos-Sepulveda et al. 2024), every newly added component is individually inspected to assess signal content and processing acceptability before it is integrated into the database. Further details related to assigning source and site metadata are provided in 2024-SCEC abstracts “Earthquake Source Parameters: Are They What You Think They Are?” (Buckreis et al. 2024) and “Application of CVMs for NGA-West3 Project” (Shams et al. 2024), respectively. The NGA-West3 database provides source, path, and site metadata in addition to peak metrics (e.g., PGA and PGV), CAV, IA, duration-metrics (i.e., times corresponding to IA-percentiles to compute significant durations), PSA, and EAS. The database is being used by several teams of NGA GMM developers and will be released to the general public sometime in 2025 when the NGA-West3 GMMs have been drafted.
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Citation: Stewart, J. P., Buckreis, T. E., Shams, R. R., Mohammed, S., Meibai, L., Kishida, T., Lanzano, G., Luzi, L., Zimmaro, P., Bradley, B. A., Huang, J., Nweke, C. C., Brandenberg, S. J., Donahue, J. L., & Bozorgnia, Y. (2024, 09). Overview of the NGA-West3 Ground Motion Database. Poster Presentation at 2024 SCEC Annual Meeting.
Keywords: ground motion prediction, database
Relevant SCEC Themes:
Improving Observations and Closing Data Gaps
Advanced Modeling Frameworks
Applied Science Implementation