NGA-Subduction research program

Bozorgnia, Yousef
Abrahamson, Norman A
Ahdi, Sean K
Ancheta, Timothy D
Atik, Linda Al
Archuleta, Ralph J
Atkinson, Gail M
Boore, David M
Campbell, Kenneth W
S-J Chiou, Brian
Contreras, Victor
Darragh, Robert B
Derakhshan, Sahar
Donahue, Jennifer L
Gregor, Nick
Gülerce, Zeynep
Idriss, I.M.
Ji, Chen
Kishida, Tadahiro
Kottke, Albert R
Kuehn, Nicolas
Kwak, DongYoup
O-L Kwok, Annie
Lin, P.
Macedo, Jorge
Mazzoni, Silvia
Midorikawa, Saburoh
Muin, Sifat
Parker, Grace A
Rezaeian, Sanaz
Si, Hongjun
Silva, Walter J
Stewart, Jonathan P
Walling, Melanie
Wooddell, Katie
Youngs, Robert R
This article summarizes the Next Generation Attenuation (NGA) Subduction (NGA-Sub) project, a major research program to develop a database and ground motion models (GMMs) for subduction regions. A comprehensive database of subduction earthquakes recorded worldwide was developed. The database includes a total of 214,020 individual records from 1,880 subduction events, which is by far the largest database of all the NGA programs. As part of the NGA-Sub program, four GMMs were developed. Three of them are global subduction GMMs with adjustment factors for up to seven worldwide regions: Alaska, Cascadia, Central America and Mexico, Japan, New Zealand, South America, and Taiwan. The fourth GMM is a new Japan-specific model. The GMMs provide median predictions, and the associated aleatory variability, of RotD50 horizontal components of peak ground acceleration, peak ground velocity, and 5%-damped pseudo-spectral acceleration (PSA) at oscillator periods ranging from 0.01 to 10 s. Three GMMs also quantified “within-model” epistemic uncertainty of the median prediction, which is important in regions with sparse ground motion data, such as Cascadia. In addition, a damping scaling model was developed to scale the predicted 5%-damped PSA of horizontal components to other damping ratios ranging from 0.5% to 30%. The NGA-Sub flatfile, which was used for the development of the NGA-Sub GMMs, and the NGA-Sub GMMs coded on various software platforms, have been posted for public use.
Earthquake Spectra


Nga-subduction research program
Bozorgnia, Yousef; Kishida, Tadahiro; Abrahamson, Norman A.; Ahdi, Sean K.; Ancheta, Timothy D.; Archuleta, Ralph J.; Atkinson, Gail; Boore, David M.; Campbell, Kenneth W.; Chiou, Brian; Contreras, Victor; Darragh, Robert; Gregor, Nick; Gülerce, Zeynep; Idriss, I.m.; Ji, Chen; Kamai, Ronnie; Kuehn, Nicolas; Kwak, Dong Youp; (null; 2018-01-01)
This paper provides an overview of NGA-Sub, a large multidisciplinary community-based research initiative to develop a comprehensive ground-motion database and multiple ground-motion models (GMMs) for subduction events. In the NGA-Sub project, we developed a database of ground motions recorded in worldwide subduction events. The database includes the processed recordings and supporting source, path, and site metadata from Japan, Taiwan, the US Pacific Northwest, Alaska, Latin America (including Mexico, Peru...
Regionalized Ground-Motion Models for Subduction Earthquakes Based on the NGA-SUB Database
Abrahamson, Norman; Gülerce, Zeynep (2020-12-01)
A set of global and region-specific ground-motion models (GMMs) for subduction zone earthquakes is developed based on the database compiled by the Pacific Earthquake Engineering Research Center (PEER) Next Generation Attenuation - Subduction (NGA-SUB) project. The subset of the NGA-SUB database used to develop the GMMs includes 3914 recordings from 113 subduction interface earthquakes with magnitudes varying between 5 and 9.2 and 4850 recordings from 89 intraslab events with magnitudes varying between 5 a...
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Otlu, Burcak; Can, Tolga (Springer Science and Business Media LLC, 2019-03-08)
BackgroundNext-generation sequencing (NGS) technologies have produced large volumes of genomic data. One common operation on heterogeneous genomic data is genomic interval intersection. Most of the existing tools impose restrictions such as not allowing nested intervals or requiring intervals to be sorted when finding overlaps in two or more interval sets.ResultsWe proposed segment tree (ST) and indexed segment tree forest (ISTF) based solutions for intersection of multiple genomic interval sets in parallel...
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Citation Formats
Y. Bozorgnia et al., “NGA-Subduction research program,” Earthquake Spectra, pp. 0–0, 2021, Accessed: 00, 2022. [Online]. Available: