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    Development of a 3D High-Resolution Velocity Model of the Canterbury, New Zealand Region (2017)

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    Type of Content
    Journal Article
    UC Permalink
    http://hdl.handle.net/10092/17410
    
    Publisher's DOI/URI
    https://doi.org/10.1785/0120160326
    
    ISSN
    0037-1106
    Collections
    • Engineering: Journal Articles [1568]
    Authors
    Bradley, Brendon cc
    Lee RL
    Thomson EM
    Ghisetti F
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    Alternative Title
    Development of a 3D Velocity Model of the Canterbury, New Zealand Region for Broadband Ground Motion Simulation
    Abstract

    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.

    Citation
    Bradley 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.
    This citation is automatically generated and may be unreliable. Use as a guide only.
    ANZSRC Fields of Research
    37 - Earth sciences::3706 - Geophysics::370609 - Seismology and seismic exploration
    40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineering

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