Generalised Parametic Function and Spatial Correlations for Seismic Velocities in the Canterbury Region based on Dynamic Site Characterisation

Background and objectives This poster presents the development of generalised parametric functions to compute seismic velocities within the sedimentary deposits of the Canterbury region, with spatial correlations to represent the unexplained velocity variability in space. Previous studies characterised the 3D structure of geologic deposits throughout Canterbury for use in ground motion simulations and site response analysis but the velocity structure within these geologic formations are yet to be considered in detail. This study makes use of the results of geophysical testing (passive and active source testing) at 23 sites throughout Christchurch city and the wider Canterbury region, as shown in Figure 1a. In the shallow near-surface (