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首页> 外文期刊>Geochemistry, geophysics, geosystems >S-wave splitting in the offshore South Island, New Zealand: Insights into plate-boundary deformation
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S-wave splitting in the offshore South Island, New Zealand: Insights into plate-boundary deformation

机译：新西兰离岸南岛的S波分裂：对板块边界变形的认识

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摘要

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 (similar to 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.
机译：新西兰板块边界带近海南岛的局部和区域性S波分裂为各向异性结构的空间和深度范围提供了限制，相对于陆基和SKS研究而言，分辨率得到了提高。利用分裂层析成像技术对海上和陆地测量结果进行的综合分析表明，板块边界切变在南岛中部和北部占主导地位。在南岛中部，该剪切带的宽度约为200 km，但由于浅层应力控制的各向异性而变得复杂。在南岛北部，板块边界平行各向异性的一个较宽的区域（> 200 km）与高山断层和Hikurangi俯冲带以及Hikurangi俯冲带本身之间的过渡断层有关。这些结果表明，南岛中部的深层事件的S相（约90 km）对板岩层上的板边界派生的NE-SW取向各向异性介质敏感，支持“薄粘性片”变形模型。

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