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Global Seismology - Subduction Zones

Figure 1

Results from recent Nature paper. Deep events from Tonga-Fiji subduction zone recorded at Australian stations are used to study mid-mantle anisotropy in the vicinity of the slab. Large circles are colour coded averages of the estimated anisotropy magnitude.

Figure 1

Three models for anisotropy below the 660_km discontinuity. (a) An anisotropic mid-mantle boundary layer which may or may not be a global feature of such a boundary (b) Slab forces on the surrounding mantle lead to mid-mantle anisotropy (c) Anisotropy associated with slab material pooling in the lower mantle.