Bradley BA, Bora S, Lee RL, Manea EF, Gerstenberger MC, Stafford PJ, Atkinson GM, Weatherill G, Hutchinson J, de la Torre CA, et al. 2022. Summary of the ground-motion characterisation model for the 2022 New Zealand National Seismic Hazard Model. Lower Hutt (NZ): GNS Science. 44 p. (GNS Science report; 2022/46). doi:10.21420/9BMK-ZK64.
Abstract
This document provides a high-level summary of the ground-motion characterisation model component of the 2022 New Zealand National Seismic Hazard Model. This includes: development of a New-Zealand-specific ground-motion database; consideration of alternative empirical ground-motion models based on global datasets; two new New-Zealand-specific models that were developed as part of the project; comparisons of the alternative models against observational data; and considered modifications of the ‘base’ models to account for near-fault directivity, back-arc attenuation for subduction earthquakes and treatment of partial correlation within epistemic uncertainty of the considered ‘backbone’ models. Finally, some limitations of the model, resulting from a lack of available datasets and/or timeframes, are discussed in the context of potential immediate avenues for further work. (The authors)
