Fig. 5.

PKiKP-PKIKP travel-time anomalies as a function of ray-angles for an hcp iron aggregate. Both eastern (blue open diamonds) and western (red open diamonds) hemisphere anomalies were tentatively adjusted by using 85% (50%) of LPO iron hcp for Δ = 150° (Δ = 130°). The solid (dashed) lines are the calculated Transversely Isotropic Model travel times for Δ = 150° (Δ = 130°). The polar African anomalies (46) and the datasets of Creager (8) and Song and Helmberger (59) are also shown as green and black open diamonds, respectively.