. Since it is the relative velocity variations that are important for teleseismic tomography, perturbations from a laterally averaged depth-dependent 1-D version of the model are shown. Comparison between the AuSREM crustal model (Fig. 4a, b) and the ambient noise model at 5 km depth, show that on-shore, there are some similarities in the pattern of anomalies, but amplitudes can be quite different. At 22 km depth, the two models become quite dissimilar, even taking into account the differences in spatial resolution. It is worth noting that the AuSREM Vs model exhibits a very similar pattern of anomalies to the Vp model (Salmon et al., 2013) due to the minimal heterogeneity in Vp/Vs ratios discussed previously.