Development of a 3D High-Resolution Velocity Model of the Canterbury, New Zealand Region (2017)
Alternative TitleDevelopment of a 3D Velocity Model of the Canterbury, New Zealand Region for Broadband Ground Motion Simulation
A 3D high-resolution model of the geologic structure and associated seismic velocities in the Canterbury, New Zealand region is developed utilising data from depthconverted seismic reflection lines, petroleum and water well logs, cone penetration tests, and implicitly guided by existing contour maps and geologic cross sections in data sparse subregions. The model, developed using geostatistical Kriging, explicitly represents the significant and regionally recognisable geologic surfaces that mark the boundaries between geologic units with distinct lithology and age. The model is examined in the form of both geologic surface elevation contour maps as well as vertical cross sections of shear wave velocity, with the most prominent features being the Banks Peninsula Miocene-Pliocene volcanic edifice, and the Pegasus and Rakaia late Mesozoic-Neogene sedimentary basins. The adequacy of the modelled geologic surfaces is assessed through a residual analysis of point constraints used in the Kriging and qualitative comparisons with previous geologic models of subsets of the region. Seismic velocities for the lithological units between the geologic surfaces have also been derived, thus providing the necessary information for a Canterbury velocity model (CantVM) for use in physics-based seismic wave propagation. The developed model also has application for the determination of depths to specified shear wave velocities for use in empirical ground motion modelling, which is explicitly discussed via an example.
CitationBradley BA, Lee RL, Thomson EM, Ghisetti F (2017). Development of a 3D Velocity Model of the Canterbury, New Zealand, Region for Broadband Ground‐Motion Simulation. Bulletin of the Seismological Society of America (2017) 107 (5): 2131-2150.
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ANZSRC Fields of Research37 - Earth sciences::3706 - Geophysics::370609 - Seismology and seismic exploration
40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineering
Showing items related by title, author, creator and subject.
McGann, C.R.; Bradley, Brendon; Cubrinovski, M. (University of Canterbury. Civil and Natural Resources Engineering, 2015)This paper summarizes the development of a high-resolution surficial shear wave velocity model based on the combination of the large high-spatial-density database of cone penetration test (CPT) logs in and around ...
Lee, R.L.; Bradley, Brendon; Pettinga, J.R.; Hughes, M.; Graves, R.W. (University of Canterbury. Civil and Natural Resources EngineeringUniversity of Canterbury. Geological Sciences, 2013)his poster presents the ongoing development of a 3D Canterbury seismic velocity model which will be used in physics-based hybrid broadband ground motion simulation of the 2010-2011 Canterbury earthquakes. Velocity models ...
Generalised parametric functions and spatial correlations for seismic velocities in the Canterbury region based on dynamic site characterisation Bradley, Brendon; Thomson EM; Cox BR; Wotherspoon LM; Wood C (2017)