Karalliyadda Sapthala C.

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Karalliyadda
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Sapthala C.
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  • Article
    S-wave splitting in the offshore South Island, New Zealand : insights into plate-boundary deformation
    (John Wiley & Sons, 2015-08-30) Karalliyadda, Sapthala C. ; Savage, Martha K. ; Sheehan, Anne F. ; Collins, John A. ; Zietlow, Daniel W. ; Shelley, Adrian
    Local and regional S-wave splitting in the offshore South Island of the New Zealand plate-boundary zone provides constraints on the spatial and depth extent of the anisotropic structure with an enhanced resolution relative to land-based and SKS studies. The combined analysis of offshore and land measurements using splitting tomography suggests plate-boundary shear dominates in the central and northern South Island. The width of this shear zone in the central South Island is about 200 km, but is complicated by stress-controlled anisotropy at shallow levels. In northern South Island, a broader (>200 km) zone of plate-boundary parallel anisotropy is associated with the transitional faulting between the Alpine fault and Hikurangi subduction and the Hikurangi subduction zone itself. These results suggest S-phases of deep events (∼90 km) in the central South Island are sensitive to plate-boundary derived NE-SW aligned anisotropic media in the upper-lithosphere, supporting a “thin viscous sheet” deformation model.