Modelling Anisotropic Spatial Cross-Correlations of Multiple Ground-Motion Intensity Measures

Although anisotropy in spatial correlations of intensity measures (IMs) has been acknowledged, few models specifically address the anisotropy, and consider cross-correlations of IMs. This study introduces anisotropic spatial cross-correlation models for 16 IMs: PGA, PGV, I<inf>a</inf>, CAV, D<inf>s5–75</inf>, T<inf>m</inf>, spectral V<inf>EIr</inf>, and SA at periods of 0.05s, 0.2, 0.5s, 1s and 2s. The models can predict for four anisotropy directions, which are angled (i.e. 0°, 45°, 90°, and 135°) relative to the fault direction. Finally, the proposed model was utilized for the regional seismic landslide hazard assessment to show a practical application.