PhD Scholarships in Ground Motion Simulation, Validation, and Applications

PhD Scholarships in Ground Motion Simulation, Validation, and Applications

Overview: Two PhD scholarships are available for multiple topics associated with earthquake-induced ground-motion and site response prediction utilizing simulation-based methods.  The overarching aim in all specific project instances is to advance understanding of ground-motion phenomena and predictive ability through hybrid broadband simulations.  In some instances, this is directly through the use of simulations for seismic hazard analysis, and in other instances through the use of simulations to constrain empirical ground-motion models for parameter combinations that observational data are deficient.  The projects are based at the University of Canterbury in Christchurch, New Zealand, but PhD students will also interact with national and international collaborators.

Specific topics: Any of the following topics are currently available:

1.     Toward fully non-ergodic considerations in ground-motion simulation: Simulations have inherent event-, region- and site-specific representations that do not make the ergodic assumption conventionally employed in many empirical ground-motion models, the most obvious being a 3D velocity/crustal model.  However, many parameters and sub-models within such simulations currently use coefficients that are constant over a broad geographical region, examples include Brune stress parameter, anelastic attenuation dependence on shear-wave velocity, and shallow site response dependence on 30-m-averaged shear wave velocity.  This project is intended to progress toward all key model parameters and sub-models having non-constant regional variation. Attention will also be given to these model and parameters having probabilistic distributions in order to enable simulations to propagate parameter uncertainty into a probabilistic ground-motion distribution.  Observational data from earthquakes in New Zealand will be used to develop regionally varying models, as well as performing validation to iteratively address trade-offs that can exist between prediction residuals and different model components.  Supervisors: Brendon Bradley, University of Canterbury; Peter Stafford, Imperial College.

2.     Validation of 3D ground-motion simulations at high frequencies: There is increasing emphasis on pushing the upper frequency limit of 3D ground-motion above 1Hz to cover the full range of engineering interest (10+ Hz).  This requires consideration of many phenomena that can be overlooked for frequencies 1Hz, including: topography, frequency-dependent Q, small-scale velocity heterogeneties, plasticity, among others.  While much emphasis has been placed on the computational inclusion of such phenomena in wave propagation simulations, little to no attention has currently been given to quantifying the improvement (if any) in the prediction of the resulting simulations against observations.  This includes understanding the LF-HF transition frequency which is optimum based on currently adopted rupture and velocity models, and thus where further research is principally needed in order to achieve greater improvements in the LF simulation that push the optimum to higher and higher frequencies. This research will seek to answer that question using a large database of observed crustal and subduction earthquakes in New Zealand. Supervisors: Brendon Bradley, Robin Lee, University of Canterbury.

Further information: on research in these fields at the University of Canterbury can be found at: https://sites.google.com/site/brendonabradley/

Relevant background: Applicants should have a background in Civil Engineering, Geophysics, or related disciplines.  High competency in data analysis, numerical modelling, and programming is desired.

PhD Scholarship Details: This scholarship includes a $35,000 NZD/year stipend (tax-free) and all university tuition and fees for the three-year duration of the PhD project.

Application Details: If interested in applying, please contact brendon.bradley@canterbury.ac.nz with the email title “PhD Scholarship in ground-motion simulation, validation, and applications” and attach the following documents: (1) CV; (2) cover letter; and (3) any digital copies of journal/conference papers and/or theses you have authored. Applications close 15 December 2025, but will be reviewed as they are submitted.  The projects are expected to start between 1 July – 1 October 2026, though a expedited/delayed start maybe possible depending on individual circumstances.