Preliminary NGA-Subduction global ground motion model with regional adjustment factors

Author(s): Parker, GA; Stewart, J; Hassani, B; Atkinson, GM; Boore, DM | Abstract: The NGA-Subduction Project is a multi-year, multidisciplinary project with the goal of developing a ground motion database and ground motion models for global subduction zone earthquakes including those in Japan, Taiwan, Cascadia, Alaska, New Zealand, South America, and Central America. Our ground motion model development is currently at the stage of identifying regional trends in path terms. We use a combination of data inspection and regression techniques to distinguish path effects in the data, including differences between interface and inslab events, forearc/back-arc effects, regional effects, and azimuthal effects. Our approach to model development is to first develop a path model capturing these effects, then to investigate source and site effects. The parameterization of functional form is guided in part by the scaling expected by a generic equivalent point-source stochastic model. We expect regionalization in path and will investigate further regionalization in site response and in overall model bias.

[1]  Robert J. Stern,et al.  SUBDUCTION ZONES , 2002 .

[2]  G. Atkinson,et al.  Equivalent Point‐Source Modeling of Moderate‐to‐Large Magnitude Earthquakes and Associated Ground‐Motion Saturation Effects , 2014 .

[3]  Gail M. Atkinson,et al.  Implications of the 2011 M9.0 Tohoku Japan earthquake for the treatment of site effects in large earthquakes , 2013, Bulletin of Earthquake Engineering.

[4]  Jonathan P. Stewart,et al.  NGA-West2 Equations for Predicting PGA, PGV, and 5% Damped PSA for Shallow Crustal Earthquakes , 2014 .

[5]  Nicholas Gregor,et al.  BC Hydro Ground Motion Prediction Equations for Subduction Earthquakes , 2016 .

[6]  Gail M. Atkinson,et al.  Regionally Adjustable Generic Ground‐Motion Prediction Equation Based on Equivalent Point‐Source Simulations: Application to Central and Eastern North America , 2015 .

[7]  Gail M. Atkinson,et al.  Predicted Ground Motions for Great Interface Earthquakes in the Cascadia Subduction Zone , 2009 .

[8]  David A. Rhoades,et al.  Ground‐Motion Prediction Equations for Subduction Slab Earthquakes in Japan Using Site Class and Simple Geometric Attenuation Functions , 2016 .

[9]  Jonathan P. Stewart,et al.  Semi-Empirical Nonlinear Site Amplification from NGA-West2 Data and Simulations , 2014 .

[10]  Gail M. Atkinson,et al.  Constraints on the Near‐Distance Saturation of Ground‐Motion Amplitudes for Small‐to‐Moderate Induced Earthquakes , 2016 .

[11]  G. Atkinson,et al.  Adjustable Generic Ground-Motion Prediction Equation Based on Equivalent Point-Source Simulations: Accounting for Kappa Effects , 2018 .

[12]  H. Thio,et al.  Attenuation Relations of Strong Ground Motion in Japan Using Site Classification Based on Predominant Period , 2006 .

[13]  N. Abrahamson,et al.  NGA-Sub ground motion database , 2018 .

[14]  Gail M. Atkinson,et al.  Empirical Ground-Motion Relations for Subduction-Zone Earthquakes and Their Application to Cascadia and Other Regions , 2003 .

[15]  A. Zollo,et al.  Ground‐Motion Prediction Equations for The Geysers Geothermal Area based on Induced Seismicity Records , 2013 .