Summary of the Abrahamson and Gulerce NGA-SUB ground-motion model for subduction earthquakes

Abrahamson, Norman A
Gülerce, Zeynep
© The Author(s) 2022.A set of region-specific ground-motion models (GMMs) for subduction zone earthquakes are developed based on the database compiled by the Pacific Earthquake Engineering Research Center (PEER) Next Generation Attenuation: Subduction project (NGA-SUB). The subset used to develop the GMMs includes 3914 recordings from 113 subduction interface earthquakes with magnitudes between 5 and 9.2 and 4850 recordings from 89 intraslab events with magnitudes between 5 and 7.8. The functional form of the global GMM accommodates the differences in the magnitude, distance, and depth scaling for interface and intraslab earthquakes. In addition to the global model, region-specific GMMs are developed for seven regions: Alaska, Cascadia, Central America, Japan, New Zealand, South America, and Taiwan. The magnitude scaling and the geometrical spreading parameters of the global model are used in all region-specific models, with the exception of the Taiwan region, which has a region-specific geometrical-spreading term. Four region-specific terms are included in the median GMM: the large distance (linear R) scaling, linear site amplification scaling (ln(VS30)), basin depth scaling (for Cascadia and Japan), and the constant term. The aleatory variability is also regionalized with larger aleatory variability at short periods for the Central America, Japan, and South America regions. Estimates of the epistemic uncertainty for the median and aleatory terms for each region are provided. The proposed global and region-specific GMMs are considered to be applicable to sites in the forearc region at distances up to 500 km, magnitudes of 5.0–9.5, and spectral periods from 0 to 10 s. The Cascadia-specific model is applicable to distances of 800 km including the backarc region.
Earthquake Spectra


Comparisons of the NGA-Subduction ground motion models
Gregor, Nick; Addo, Kofi; Abrahamson, Norman A; Al Atik, Linda; Atkinson, Gail M; Boore, David M; Bozorgnia, Yousef; Campbell, Kenneth W; Chiou, Brian S-J; Gülerce, Zeynep; Hassani, Behzad; Kishida, Tadahiro; Kuehn, Nico; Mazzoni, Silvia; Midorikawa, Saburoh; Parker, Grace A; Si, Hongjun; Stewart, Jonathan P; Youngs, Robert R (2022-01-01)
© The Author(s) 2022.In this article, ground-motion models (GMMs) for subduction earthquakes recently developed as part of the Next Generation Attenuation-Subduction (NGA-Sub) project are compared. The four models presented in this comparison study are documented in their respective articles submitted along with this article. Each of these four models is based on the analysis of the large NGA-Sub database. Three of the four current models are developed for a global version as well as separate regionalized m...
A one-pass predictor-corrector algorithm for the inverse Langevin function
BAŞDEMİR, SELÇUK; Dal, Hüsnü (2022-01-01)
© The Author(s) 2022.Inverse Langevin function has an extensive use in statistical mechanics, polymer chemistry, and physics. Main struggle is that the inverse Langevin function cannot be expressed in an exact analytical form. To this end, many approaches to estimate the inverse Langevin function have been proposed. A trade-off can be observed between level of accuracy and mathematical complexity in the existing approximants in the literature. In the present contribution, a simple, yet efficient one-pass pr...
Efficient exascale discretizations: High-order finite element methods
Kolev, Tzanio; et. al. (2021-01-01)
© The Author(s) 2021.Efficient exploitation of exascale architectures requires rethinking of the numerical algorithms used in many large-scale applications. These architectures favor algorithms that expose ultra fine-grain parallelism and maximize the ratio of floating point operations to energy intensive data movement. One of the few viable approaches to achieve high efficiency in the area of PDE discretizations on unstructured grids is to use matrix-free/partially assembled high-order finite element metho...
Collision-Free Motion Planning for an Aligned Multiple-Turret System Operating in Extreme Environment
Yerlikaya, Ümit; Balkan, Raif Tuna (2021-01-01)
© The Author(s), 2021. Published by Cambridge University Press.Instead of using the tedious process of manual positioning, an off-line path planning algorithm has been developed for military turrets to improve their accuracy and efficiency. In the scope of this research, an algorithm is proposed to search a path in three different types of configuration spaces which are rectangular-, circular-, and torus-shaped by providing three converging options named as fast, medium, and optimum depending on the applica...
Development of a three-dimensional basin model to evaluate the site effects in the tectonically active near-fault region of Gölyaka basin, Düzce, Turkey
Yousefi-Bavil, Karim; KOÇKAR, MUSTAFA KEREM; Akgün, Haluk (2022-01-01)
© 2022, The Author(s), under exclusive licence to Springer Nature B.V.The high seismicity and tectonic activity of the study area located in a near-fault region in Gölyaka, Düzce, results in a bedrock geometry highly complex in the sense of faulting and deformation. This makes this area very challenging in terms of a site response study that would aid seismic hazard assessment. This study develops a basin model to evaluate the site effects in the tectonically formed Plio-Quaternary fluvial sedimentary layer...
Citation Formats
N. A. Abrahamson and Z. Gülerce, “Summary of the Abrahamson and Gulerce NGA-SUB ground-motion model for subduction earthquakes,” Earthquake Spectra, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: