NGA-Subduction research program. Issue 2 (May 2022)

• Record Type: Journal Article
• Authors: 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; Gulerce, Zeynep; Idriss, IM; 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;
• Is Part Of: Earthquake spectra. Volume 38:Issue 2(2022)
• Page Start: 783
• Page End: 798
• Publication Date: 2022-05
• Subjects: Ground motion models -- subduction earthquakes -- NGA -- Next Generation Attenuation for Subduction -- attenuation -- seismic hazard; Earthquake engineering -- Periodicals; Earthquake engineering; Periodicals; 624.1762
• DOI: 10.1177/87552930211056081
• Languages: English
• ISSNs: 8755-2930

Abstract

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.