Broadband Seismic Deployments for Imaging the Upper Mantle Structure in the Lützow-Holm Bay Region, East Antarctica

Figure 9

Splitting parameters of 𝜙 and 𝛿𝑡 plotted as a function of back azimuth. Vertical dashed lines are the direction of null measurements. At stations for AKR, LNG, SKL, SKV, SYO, and TOT, the azimuthal variations of apparent splitting parameters are modeled by a two-layer case of anisotropy. The parameter pair (𝜙₁, 𝛿𝑡₁) describes the lower layer anisotropy and (𝜙₂, 𝛿𝑡₂) corresponds to the upper layer. All the figures are after Usui et al. [16].