Snapshot of the seismic wave radiation from a strike-slip source at the centre of the model (star), showing the P (red) and S (green) contribution of the seismic wavefield. (a) A homogeneous model and (b) a heterogeneous model characterized by von Karman ACF with a = 5 km, κ = 0.5 and ɛ = 0.03, and (c) ɛ = 0.07.